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Osaka has not played since withdrawing from the French Open after revealing she would skip press conferences at Roland Garros as "people have no regard for athletes' mental health".

The four-time grand slam champion from Japan revealed she had suffered "long bouts of depression" since winning the US Open in 2018.

Osaka says she has not changed her stance on press conferences and feels she had been unfairly scrutinised.

The world number two wrote in Time magazine: "I communicated that I wanted to skip press conferences at Roland Garros to exercise self-care and preservation of my mental health. I stand by that.

"Athletes are humans. Tennis is our privileged profession, and of course there are commitments off the court that coincide. But I can't imagine another profession where a consistent attendance record [I have missed one press conference in my seven years on tour] would be so harshly scrutinised.

"Perhaps we should give athletes the right to take a mental break from media scrutiny on a rare occasion without being subject to strict sanctions.

"In any other line of work, you would be forgiven for taking a personal day here and there, so long as it's not habitual. You wouldn't have to divulge your most personal symptoms to your employer; there would likely be HR measures protecting at least some level of privacy.

"In my case, I felt under a great amount of pressure to disclose my symptoms - frankly because the press and the tournament did not believe me. I do not wish that on anyone and hope that we can enact measures to protect athletes, especially the fragile ones.

"I also do not want to have to engage in a scrutiny of my personal medical history ever again. So I ask the press for some level of privacy and empathy next time we meet."

Osaka is feeling the benefits of a break and is relishing representing her country in the Olympics on home soil in Tokyo.

"After taking the past few weeks to recharge and spend time with my loved ones, I have had the time to reflect, but also to look forward," the 23-year-old said. 

"I could not be more excited to play in Tokyo. An Olympic Games itself is special, but to have the opportunity to play in front of the Japanese fans is a dream come true. I hope I can make them proud."

Postponed due to the coronavirus pandemic, the Games are scheduled to begin on July 23 this year.

This year's Australian Open will begin on February 8 after players quarantined ahead of the first grand slam of the year.

Osaka said she would be prepared to do it all again if it meant she got the chance to play at the Olympics.

"Honestly, my concern isn't the athletes. The way that I feel is I will stay in my room for two weeks to play the Olympics. I missed out on the last one," the Japanese star told a news conference on Sunday.

"Playing in Tokyo would be very special to me. My concern would be the general safety of everyone else because you're opening the country.  Everyone is flying in from different places. I would just want the public to feel safe.

"I feel like the athletes definitely would want to play, but I would want the public to feel safe."

Doubts have also been cast over the Olympics going ahead this year due to COVID-19.

Osaka, a three-time major champion, said while people she had spoken to were excited, some were worried.

"For me the people that I've spoken to, they're really excited about it, but they're concerned because, I don't know, there's just like so many different people entering. I don't know," she said.

"For the people I've talked to, they said as long as everyone is safe, as long as Japan is getting better and not worse, then it should be okay.

"But for me, hmm, don't quote me on that."

Ahead of the Australian Open, Osaka is playing the Gippsland Trophy, where she will face either Alize Cornet or Ajla Tomljanovic in the second round.

One week on from losing to Ash Barty in the Wimbledon semi-finals, Kerber said it was "disappointing" to pull out of the Games.

The former Australian Open, Wimbledon and US Open champion said in a statement: "The thought of participating at the Olympics has been a constant motivation for me over the past months to push further and keep believing in my goals.

"Representing Germany in London 2012 and Rio 2016 as part of the German team has always been one of my favourite memories of my career so far.

"This makes it even more disappointing for me to accept the fact that my body needs rest after the intense few weeks that lie behind me and that I have to recover first before returning to competition later this summer!

"Thank you for your support, as this has been a very difficult decision for me. Good luck to all my fellow German athletes in Tokyo #TeamDeutschland, I will miss you."

Kerber reached the Olympic final in Rio in 2016 but suffered a shock defeat in the title match to Monica Puig of Puerto Rico, having to settle for the silver medal.

Her absence this year means the field is further depleted, with Serena Williams, Bianca Andreescu, Simona Halep and Sofia Kenin among the high-profile WTA Tour stars who will be absent in Japan. Puig will also miss out after undergoing shoulder surgery.

The men's line-up has been similarly hit, with Roger Federer, Rafael Nadal and Dominic Thiem choosing not to play.

Tuesday saw heavy downpours in the Japanese capital, but the hot and humid conditions from earlier in the week returned early on Wednesday with temperatures at times going above 30 degrees Celsius.

Vondrousova, who had shocked home favourite Naomi Osaka in the previous round, won the first set 6-3 at Ariake Tennis Park but her opponent was clearly struggling as she prepared to play the second set.

She required medical assistance to depart the court, as Vondrousova progressed to the final four.

VONDROUSOVA COMMENTS ON THE HEAT

The conditions for the tennis in Tokyo have been a quite literal hot topic with both Daniil Medvedev and Novak Djokovic stating matches should start at 3pm so the majority can be played as temperatures cool.

Vondrousova explained how it was playing in the searing heat, saying: "It was a big struggle from the beginning.

"I warmed up in the morning and I felt it was really hot and humid. Also, I was a bit tired from yesterday because I had doubles too.

"But I knew she had too [singles and doubles]. I felt like we both were struggling from the beginning.

"I was just thinking, you have to stay there mentally, just fight for every point and just see what happens. It's good for me that I can have some rest now.

"It's all about the head too. You have to stay there mentally and fight. Even when you lose the point, you have to get up and fight again. It's really a struggle here with the weather, but that's it, we have to fight."

OLYMPICS LIKE A SLAM FOR SVITOLINA

Next up for Vondrousova is a last-four meeting with Elina Svitolina, the fourth seed and highest-ranked player left in the women's draw.

The Ukrainian was a 6-4 6-4 victor over Camila Giorgi and talked up the significance of winning Olympic gold.

"I know that for Ukraine, [the Olympics] is a really big thing," Svitolina said. 

"I value the Olympics as a grand slam, and I tried to prepare to bring my best tennis. Here I am in the semi-final, and I can get a chance to get a medal. It's very special for me, but I try to take one match at a time."

Belinda Bencic (9) came through 6-0 3-6 6-3 against Anastasia Pavlyuchenkova on the other side of the draw. She will face Elena Rybakina (15), who was too good for seventh seed Garbine Muguruza in a 7-5 6-1 win.

Ash Barty was beaten along with partner Storm Sanders in the women's doubles quarter-finals earlier on Wednesday but the world number one bounced back to win her first-round mixed doubles match with partner John Peers.

The Australian duo beat Argentina's Horacio Zeballos and Nadia Podoroska 6-1 7-6 (7-3).

In a stacked women's draw, world number one and Wimbledon champion Barty has a tough opening assignment and could face French Open finalist Anastasia Pavlyuchenkova, the 13th seed, as early as round three.

Spectators may not be in attendance at Tokyo venues for the Olympics but Japanese fans will be rooting for Osaka, who returns to action after a two-month hiatus with the four-time grand slam winner having spoken openly about mental health and anxiety issues.

Viktorija Golubic or Maria Camila Osorio Serrano would await Osaka if she can get through round one, but a dream final with Barty is no shoo-in given 15 of the world's top 20 on the WTA Tour are in action including each of the nine leading the race for the 2021 WTA Finals.

Aryna Sabalenka (3), Elina Svitolina (4), Wimbledon runner-up Karolina Pliskova (5), Iga Swiatek (6) and Garbine Muguruza are all featuring in Tokyo.

The men's side has been hit by a spate of withdrawals, with Rafael Nadal, Roger Federer and Dominic Thiem among those not playing in the Japanese capital.

The main talking point surrounds whether the all-conquering Djokovic can continue his march towards a calendar Golden Slam – a sweep of all four majors and an Olympic gold in the same year.

Any notion of a free ride for the Serbian is wide of the mark, though. His side of the draw could see him come up against Andrey Rublev (5), Alexander Zverev (4) and Hubert Hurkacz (7), while Stefano Tsitsipas (3) – beaten by Djokovic in the French Open final – and Daniil Medvedev (2) are among the potential final opponents.

Andy Murray, gold medal winner in 2012 and 2016, faces Canada's Felix Auger-Aliassime in a tricky first-round match.

That is the view of former Wimbledon winner Pat Cash, though he warned there is plenty of scope for upsets in both the men's and women's singles.

Monica Puig claimed a surprise victory at Rio 2016 - then ranked 34th, she stunned Angelique Kerber in the final after beating Petra Kvitova and Garbine Muguruza en route to give Puerto Rico their first-ever gold medal.

Roger Federer and Novak Djokovic are two greats on the men's side who have not tasted Olympic glory, something the Serbian will look to put right this year as he pursues a Golden Slam.

Cash, though, would not be surprised to see the Olympics throw up another surprise result, even though he hopes to see compatriot Barty come out on top in the women's tournament.

He told Stats Perform: "The women's draw is very, very even. If you don't play well in one of those matches, you're out. 

"There's no such thing as an easy first round really in a tournament such as the Olympics, particularly the men’s side where it's best of three sets. So if you slip up, you're gone. 

"There's no chance of coming back from two sets to one down, because it's over. So that's trickier for somebody like Djokovic who can typically run people into the ground.

"Ash has got a great chance of winning the Olympics, but I think probably there's 30 girls who think they can do that as well and they're probably right. 

"We've seen some unusual results in the Olympics and shorter form tournaments like that, also on the men's side.

"It's very hard to say, but obviously, [Barty] is in great form and full of confidence - that goes a long way to winning a gold medal."

There have been a host of high-profile withdrawals from the tennis in Tokyo.

Rafael Nadal, Federer, Dominic Thiem, Matteo Berrettini, Serena Williams, Sofia Kenin, Simona Halep and Coco Gauff among a large list of top players who will be missing.

Some absences were unavoidable due to injuries or positive coronavirus cases but some players have opted to rest amid a hectic calendar, avoiding Japan's strict COVID-19 rules in the process.

Cash has mixed views on the subject but does feel playing at the Olympics should be seen as a rare and valuable opportunity.

"I think I think they would [look back fondly at winning a medal]," said Cash.

"It’s certainly one of the regrets in my career that I didn't play the Olympics [in 1988]. I had a niggling injury and decided to rest. 

"Looking back, I thought I could have won a medal, maybe even a gold medal. I would have probably given it a really good shot. 

"In my era it wasn't the pinnacle. I think Novak Djokovic has talked about that now, he said, ‘The main thing for me is winning slams, they're the pinnacle of our game’. 

"But to win a gold medal, it's pretty cool. You'll find that the players who do win a gold medal, if you tell the grandkids, 'I won a Wimbledon trophy' or 'I won a gold medal', they’ll go, 'Oh, where’s the gold medal?'

"Having said that, there's a lot of players who aren't playing the Olympics this year. Certainly for a few years, it was a novelty - I'm not sure if it's wearing off or not. 

"But to perform for your country, I think is an honour and we haven't had the opportunity to do that much in the last couple of years. 

"With the Davis Cup, the men's competition is really just a fading, unfortunately, dying competition, which not many people really care about any more.

"That's very, very sad, so the Olympics is often the best opportunity to represent your country."

Cash delved deeper into the dilemma players are likely to have faced.

"I wouldn't put any criticism on anybody for the personal choice after these last 18 months," he said. "It's their choice, everybody's got a different journey in this and it's part of their careers. 

"With COVID and all that sort of stuff that's going on - the bubbles - some of the stresses are unknown like being away from family and friends for months on end and not actually have any break. 

"Everybody's got their own different stories, some of them are injured, some were coming back from injury, some think 'I'm not going to make a trip to Japan' - with all the restrictions it's not going be fun. 

"It's not going to be a fun Games where you can go there and watch the other athletes. In Los Angeles [the 1984 Games] the highlight was actually to go and watch the track events, which I did.

"That's not going to happen, you're in a hotel, you're in the village or, you're gonna go straight to the tennis and back only to a certain area of the village, I think it's going to be locked down for tennis players only. 

"You may not be able to mingle with the other athletes. So I think a lot of the fun has been taken out of this. 

"But again, it's representing your country and trying to get trying to get a gold medal. So some players will go to great lengths to do that."

The world number one and recently crowned Wimbledon champion was among the favourites for glory in the women's event but put in an uncharacteristically error strewn display at the Ariake Tennis Park.

In total, the amiable Australian racked up a whopping 55 errors in a match that lasted a little over an hour and a half.

Sorribes Tormo had never faced off against Barty before but kept cool amid the stifling Tokyo conditions to progress to a second-round tie with Fiona Ferro of France.

It also marked the first time the 24-year-old had ever beaten a player ranked number one in the world.

Barty's Tokyo adventure is not over just yet, though. On Saturday she and childhood friend Storm Sanders made it through round one of the women's doubles with a 6-1 6-2 beating of Japanese Nao Hibino and Makoto Ninomiya.

The world number one saw her hopes of winning a gold medal for Australia at Tokyo 2020 brought to an end on Friday.

Barty and partner John Peers won the first set against Russian Olympic Committee duo Andrey Rublev and Anastasia Pavlyuchenkova.

But Rublev and Pavlyuchenkova turned it around to win an epic clash 5-7 6-4 13-11 and reach the final.

With Barty already eliminated in the singles and women's doubles competitions, the best she can now hope for is a bronze medal alongside Peers.

They will meet Serbia's Novak Djokovic and Nina Stojanovic for the last spot on the podium.

"It is a tough one to swallow," said Barty. "I think those tie-breaks at times, they go either way and we just didn't quite have the run of the grain. 

"We put ourselves in a position to win the match, we just weren't able to close it out. It was a good level, no doubt disappointing."

Another chance at a medal means Wimbledon champion Barty will try to get over her loss swiftly.

She added: "But we get to fight for a medal - this one hurts but we still have an opportunity to play another match and try to win a medal for Australia. 

"We pick ourselves up pretty quickly, move on and know that we will give it our all and keep fighting right until the end.

"It's been quite a while since we've had an Australian medallist here [in tennis] at the Olympics so we're looking forward to that challenge."

In the men's doubles, Nikola Mektic and Mate Pavic are Olympic champions after they beat fellow Croatia representatives Marin Cilic and Ivan Dodig in the final.

Osaka was given the honour of carrying the torch on the short final leg at the Japan National Stadium before walking the steps to light the flame and end the opening ceremony.

The four-time grand slam champion is the face of the Tokyo Games in her home country, creating extra pressure on her shoulders as she bids to strike gold.

Djokovic appreciates the absences of legendary names Roger Federer and Rafael Nadal is a blow, but he believes Osaka's presence is crucial for tennis in the battle for media coverage at the Games.

"It cannot be better for our sport, you are representing yourself, your country but also your sport in the Olympic Games, you're trying to get the hype and the attention towards our sport as much as you possibly can, so we're all contributing to that in the Olympic Village," Djokovic said when asked about Osaka's role in Friday's ceremony.

"There's a lot of attention towards the tennis players which is great, from the other athletes which is very nice to see, very nice to experience.

"Obviously you don't have Roger or Rafa. They are big stars and legends of our sport, but still there's quite a lot of great athletes, top players. Naomi is a home favourite and a lot of eyes are on her.

"Being at home playing is a lot of pressure, but it's great for our sport just in general to see that there's a lot of attention towards it."

Djokovic was speaking after overcoming Hugo Dellien with ease in his opening outing in the men's singles tournament, the Serbian triumphing 6-2 6-2 in just over an hour.

The quick win allowed the recently crowned Wimbledon champion to avoid staying out for too long in the Tokyo heat, an issue that led to Daniil Medvedev calling for matches to be pushed back to later in the day, allowing players to compete during the evenings when the temperatures have dropped.

"I agree with him 100 per cent," Djokovic said of Medvedev's suggestion. "I actually asked as well.

"My team captain, Viktor Troicki, was speaking to the referee a couple of times. To be honest, I don't understand why they don't start matches at say 3pm.

"I've heard for tennis there is some kind of curfew they have to finish at midnight, but if that's the case, I've just finished the last match and it's not even 5pm, we still have seven hours to play. 

"They have lights on all the courts, they're going to make life much easier for all of us tennis players, I just don't understand why they don't move it. 

"It's actually for the television broadcasters even better, because the later you play, the better it is for the United States and the time zones in Europe.

"I don't know, maybe the ITF (International Tennis Federation) can give you a better answer to why they chose to be played in the middle of the day. I doubt they will change the decision, but we're hoping that they will."

The only men to have won each of the singles majors across their careers, plus Olympic gold, are Andre Agassi and Rafael Nadal, and now Djokovic aims to move to the brink of winning all five in his remarkable 2021 season.

Fresh from dominating at Wimbledon, and with the Australian and French Open titles already in the bag, Djokovic heads into the Tokyo Games as a red-hot favourite, seeking to set himself up to complete a historic campaign at the US Open.

Naomi Osaka will enter the Games with almost as much expectation behind her too, the reigning US Open and Australian Open champion eyeing glory for hosts Japan.

But tennis has thrown up a host of shock results in its short Olympic history. Here, Stats Perform looks at the sport's place in the Games.

WHO'S IN, WHO'S OUT, AND WHAT DOES ALL THIS MEAN?

Serena Williams, Roger Federer and Rafael Nadal have all opted out of the Olympics.

Williams made her mind up prior to suffering a leg injury at Wimbledon, although she is already a member of the career Golden Slam club.

Federer reached his decision after revealing he also suffered a physical setback at the All England Club, and Nadal elected to take a two-month break after relinquishing his French Open title.

Don't expect to see them again at the Olympics, given Williams and Federer will be pushing 43 by Paris 2024, and Nadal will be 38. Federer won a doubles gold with Stan Wawrinka in 2008, but his singles peak was the silver medal he earned in 2012, Andy Murray crushing Swiss hopes in the final at Wimbledon.

Dominic Thiem, Bianca Andreescu, Nick Kyrgios, Simona Halep, Angelique Kerber, Victoria Azarenka and Denis Shapovalov are among other confirmed absentees, with fitness issues a factor for some, less so for others.

The COVID-19 crisis is a mitigating factor in why so many stars are staying away, and directly responsible in the case of some players, such as Britain's Johanna Konta and Dan Evans, who both tested positive recently.

But tennis was only fully restored to the Olympic programme in 1988, after being dropped post 1924, and if players are seen to be favouring the grand slams over the Games, that is not such a great look for the sport.

At a time when the International Olympic Committee has shown it is willing to shake up the sports on its programme, tennis could perhaps do with a headline-making Tokyo 2020.

Murray, the two-time defending men's champion, will target an improbable hat-trick. A hat-trick for the injury-hit former world number one would be a sensation, and Osaka landing gold in the women's tournament would surely be one of the great moments of the Games.

DJOKOVIC FOLLOWING IN THE FOOTSTEPS OF GRAF

When Steffi Graf beat Gabriela Sabatini in the women's singles final at Seoul, it completed what we know now as the calendar 'Golden Slam'. She had already won the Australian Open, French Open, Wimbledon and the US Open, and the feat of the then 19-year-old West German has yet to be repeated.

Now Djokovic is three-fifths of the way to a similar clean sweep of the majors and the Olympics, with the US Open getting under way on August 30 in New York.

He teetered on not going to Tokyo, and perhaps he is to some extent endangering his chances at Flushing Meadows by spending more time travelling and enduring bubble life, while others rest up.

But Djokovic is a fiercely proud Serbian and could not resist a great chance of winning gold for his country. He landed bronze at the 2008 Games in Beijing but in 2012 he lost to Juan Martin del Potro in the bronze-medal match, and a cruel draw at Rio four years later saw him assigned Del Potro in the first round.

Top seed Djokovic bowed out in two tie-breaks to the powerful Argentinian, describing the outcome as "one of the toughest losses in my career".

There is no danger of a hat-trick of defeats to Del Potro, which may help Djokovic. Del Potro has been battling for two years to get back to fitness, undergoing four rounds of right knee surgery in a bid to get back on tour.

RAISING THE BAR AT THE OLYMPICS

How the Olympic village functions in Tokyo will be distinctly different to at previous Games, given the pandemic restrictions in place that could be a real buzzkill.

But in the past there have been countless cases of athletes becoming inspired by their surroundings and going on to perform above their usual level.

It can be a party village, and it can also be an eyebrow-raising experience as global superstars rub shoulders with competitors who might struggle for recognition in their home towns. More than anything, the shared team experience, fighting for a collective cause, can make a middling athlete believe they can be great.

Monica Puig was a massive tennis outsider in 2016 but the then world number 34 won the women's singles, stunning Angelique Kerber in the final after beating Petra Kvitova and Garbine Muguruza en route. That gave Puerto Rico their first ever Olympic gold medal.

In 1992, a tournament that featured the likes of Pete Sampras, Jim Courier, Stefan Edberg and Boris Becker finished with a staggering final match-up of Marc Rosset versus Jordi Arrese, who in his home city of Barcelona was edged out 8-6 in the fifth set by the Swiss world number 43. Nobody would have predicted that head to head for gold.

Similarly, at Athens 2004, Nicolas Massu beat Mardy Fish in the gold medal match of a tournament that featured Federer, Andy Roddick, Carlos Moya and Tim Henman.

In the 1996 Atlanta Games, Lindsay Davenport, who had just turned 20, took inspiration from being the daughter of an Olympian, with dad Wink having played volleyball for the United States at Mexico City in 1968.

Davenport was beginning to make an impact on the WTA Tour but was only the ninth seed at the Olympics, yet she swept through the rounds before sinking Arantxa Sanchez Vicario 7-6 (10-8) 6-2 in the final.

"It's like one of those things I look back on and I'm like, 'Was that me?'," Davenport told The Tennis Podcast last year.

"It doesn't seem like it was real. I'd made the transition to the pro tour pretty well, but I liked hanging out between eight and 16 in the rankings. I was very insecure, unsure of what could I do. I liked doing well but I wasn't sure I wanted to do too well because it seemed really overwhelming to be one of those top players.

"Here I go at 20 years old to Atlanta for two or three weeks, in a setting that seemed so comfortable. Look at all these athletes, you have all different shapes and sizes, you have players that are really working hard but have so much in common and you get to hang out with them, breakfast, lunch, dinner in the village."

Davenport was a future world number one and three-time grand slam singles champion, but at this point in her career being an American at an Olympics in the United States was just a thrill.

"You're sharing this with your team-mates who are some of my best friends in Mary Joe Fernandez, Monica Seles. It was the best time ever," she said.

"By the time the tournament actually started we were like, 'Yeah, I'll go play my match and then we'll go back to the village and we'll hang out', and everything went so fast in those few weeks.

"And there I was left standing, winning at the end because I was so incredibly happy and excited with everything that was going on. I kind of forgot what was my job.

"When it became a reality of even just making the team in '96, it was so huge also for my family with having a second generation Olympian."

The surprising 6-1 6-4 loss that a lacklustre Osaka suffered on Tuesday could be explained away by the fact the 23-year-old had not played any competitive tennis since pulling out of the French Open at the end of May.

All the same, it was a major upset as world number 42 Vondrousova took out the highest remaining seed in the draw – the Japanese star who lit the Olympic cauldron on Friday.

Osaka's exit, after previous shock defeats for top seed Ash Barty and number three Aryna Sabalenka, has raised the prospect of a shock champion, just as occurred five years ago at the Rio Games when Monica Puig of Puerto Rico caused a sensation.

Now at the quarter-final stage, there is one former grand slam champion left in the field and two finalists at that level, but it really looks like anyone's title.

VONDROUSOVA SENSES AN OPPORTUNITY

It was remarkably straightforward for Vondrousova at Ariake Tennis Park, as she cruised through the opening set and soon reeled in Osaka's early break in the second.

Osaka saved two match points when serving to stay in the contest, but not a third, planting a backhand wide.

Considering Vondrousova reached the French Open final two years ago, in front of packed grandstands rather than the empty seats in Tokyo, it was no surprise she hesitated when asked whether this win over Osaka was the biggest of her career. It probably doesn't have that cachet, good a win though it was.

"Of course it's one of the biggest," Vondrousova said.

"Naomi is a great player, she has so many grand slams, so I knew it would be a tough match. But I'm just very happy with my play. I played amazingly in the first set, and then the second set was really tough. I'm just happy to be through.

"I think she was struggling a bit with my serving. Also, I use drop-shots very well. I'm just very happy with my game today."

She faces Spain Paula Badosa next and said: "It's very open now. I think every girl is playing really well. Now it's the quarter-final, so we'll see."

HAS SVITOLINA'S TIME ARRIVED?

A fixture in the top 10 over recent seasons, Svitolina has been unable to transfer her regular tour form onto the major stage on a consistent basis.

Maybe the Olympics will be a platform towards success on that stage, with Svitolina now the highest seed remaining in the draw, at number four. The Ukrainian is also on a high on the personal front, having married French tennis star Gael Monfils shortly before heading to Tokyo.

Two semi-finals, at Wimbledon and the US Open in 2019, have been her deepest runs in the majors, and this season has been one of diminishing returns, with a fourth-round run in Australia followed by a third-round Roland Garros exit and a round-two loss at Wimbledon.

Svitolina beat Maria Sakkari of Greece 5-7 6-3 6-4 on Tuesday, setting up a quarter-final against Italian Camila Giorgi who won 6-4 6-2 against Wimbledon runner-up Karolina Pliskova.

"I don't think I'm a favourite because there are lots of good players here and everyone is quite equal," Svitolina said.

A MUG SHOT?

Should Spain's Garbine Muguruza be considered the favourite from this point? With French Open and Wimbledon titles in her trophy room, Muguruza has shown she has what it takes to triumph on a big stage, and a clinical 6-4 6-1 win over Belgian Alison Van Uytvanck on Tuesday was just the job.

She goes on to face Elena Rybakina of Kazakhstan, who edged past Croatian Donna Vekic.

Belinda Bencic of Switzerland caused a surprise by ousting the in-form reigning French Open champion Barbora Krejcikova, springing a 1-6 6-2 6-3 win that means there will be no repeat of the Roland Garros final in the quarter-finals.

That had been on the cards, but Bencic will be the player who takes on Anastasia Pavlyuchenkova for a place in the final four.

Pavlyuchenkova scored an impressive 6-1 6-3 victory over Sara Sorribes Tormo of Spain, the player who knocked out Barty in round one.

Russian Olympic Committee's Pavyluchenkova is looking to harness the form that took her to a maiden slam final, describing her Paris run as "a great experience to have".

"But every week is a new week and this is a new event," said the 30-year-old. "The Olympic Games is a very special event. It's different. It's nothing like the others."

Japan's big hope for gold will play China's Zheng Saisai in her opener at the Ariake Tennis Park.

The match was billed to be first on the centre court at 11:00 local time on Saturday, only for Games organisers to announce it has been moved back by a day.

The move came amid mounting expectation that Osaka would have a prominent role to play in Friday's opening ceremony, meaning she would have little time to rest between taking part in that event and playing Zheng.

Osaka abandoned her French Open campaign after one match, having been warned she risked expulsion for refusing to take part in news conferences during the tournament.

The reigning US Open and Australian Open champion, who has spoken of struggling with anxiety and depression, then elected to skip Wimbledon.

The world number two had seen top-ranked Ash Barty bounced out in the first round, and the face of Japan's Games looked primed for a run deep into the tournament.

But the prospects of home glory in women's tennis were dashed in round three when Osaka crumbled 6-1 6-4 to Marketa Vondrousova of the Czech Republic.

Osaka, who lit the Olympic cauldron in Friday's opening ceremony, was left scrambling for answers as to why she underperformed.

"How disappointed am I? I mean, I'm disappointed in every loss, but I feel like this one sucks more than the others," she said.

"I definitely feel like there was a lot of pressure for this. I think it's maybe because I haven't played in the Olympics before and for the first year [it] was a bit much."

Asked what went wrong against the world number 42, Osaka said: "Everything – if you watch the match then you would probably see. I feel like there's a lot of things that I counted on that I couldn't rely on today."

There were certainly mitigating circumstances that the 23-year-old might have pointed to, given she had not played since the French Open before heading into the Olympics.

Osaka pulled out of Roland Garros after winning through her first-round match, citing anxiety and pointing to episodes of depression as she explained why she refused to take part in news conferences during the tournament.

Her declarations in Paris came after the four grand slam tournaments warned she could be thrown out of their events if she persistently refused to talk to the media.

Already a four-time grand slam winner, Osaka has found plenty of public support and there was criticism of the tennis authorities for their stance.

To many in Japan, she can do little wrong, although she could also do little right against Vondrousova. Osaka had 32 unforced errors to just 10 from Vondrousova, who also hit more winners.

After saving two match points, Osaka swung a backhand wide on a third to seal her exit.

Despite her disappointment, Osaka felt she had given a reasonable account following a recent absence from the tour, which saw her miss Wimbledon.

But the Games called for more than that, and it was a deflated Osaka who spoke afterwards, explaining how the pressure on her shoulders proved overbearing.

"I've taken long breaks before and I've managed to do well," she said. "I'm not saying that I did bad right now, but I do know that my expectations were a lot higher.

"I feel like my attitude wasn't that great because I don't really know how to cope with that pressure, so that's the best that I could have done in this situation."

With Ash Barty having suffered a shock exit a day prior, Osaka is now the favourite for glory on home court and with Aryna Sabalenka and Iga Swiatek among the round-two casualties that status is sure to only be enhanced.

There was better news for Elina Svitolina and Karolina Pliskova at the Ariake Tennis Park, though, in a women's draw stacked with top-tier talent.

OSAKA NOT GETTING AHEAD OF HERSELF

Back after a self-imposed two-month hiatus, defending US and Australian champion Osaka has not missed a beat and was too good for Viktorija Golubic in a 6-3 6-2 victory.

Osaka won 24 of 26 service points in the first set and 37 of 45 in the second, facing break point only once in a one-sided affair.

"It would mean a lot to win gold here, but I know it's a process," she said. "I know these are the best players in the world and honestly I haven't played in a while, so I'm trying to take it one notch at a time.

"All in all, I'm just really happy to be here. I haven't been in Tokyo for a couple of years."

Svitolina was not as comfortable with the fourth seed rebounding from losing the opening set to defeat Ajla Tomljanovic 4-6 6-3 6-4. Maria Sakkari (14) awaits in the next round.

Carla Suarez Navarro earned her first win since recovering from cancer in round one and battled valiantly against Karolina Pliskova (5) before eventually losing in three sets.

Garbine Muguruza (7), Barbora Krejcikova (8) and Belinda Bencic all coasted through in straight sets, as did Anastasia Pavlyuchenkova (13) and Elena Rybakina (15).

TEARS FOR IGA 

Swiatek, whose father was an Olympic rower, would have had strong designs on a deep run at the Games but was beaten 6-3 7-6 (7-4) by Paula Badosa.

The Pole was left in tears after the defeat, and was still sobbing at her chair several minutes after the end of the match.

Sabalenka also bit the dust, going down in three sets to Donna Vekic, while Petra Kvitova lost the deciding set of her tie with Alison Van Uytvanck 6-0 to bow out with a whimper.

Japan's Osaka has not played since withdrawing from the French Open after one match at the end of May, having revealed she would skip press conferences as "people have no regard for athletes' mental health".

Prior to taking a break from the sport, four-time grand slam champion Osaka revealed she had suffered "long bouts of depression" since winning the US Open in 2018.

The 23-year-old said this month she wants "some level of privacy and empathy" from the media when she returns to action and but also discussed her excitement at playing in a "dream" Olympics.

Former Wimbledon champion Cash insists Osaka has the game to triumph but feels it is a tougher task now given her main opponents are coming off two grand slams in quick succession.

"Yeah, she said [she was taking] time out – it's hard to know if she's going to be match hardened," Cash said to Stats Perform.

"I think that's the thing about playing Wimbledon, the grass court season. Are you match toughened? 

"That goes a huge, huge way [to achieving success, and not having that] is putting yourself under pressure and especially under those circumstances if it's for a gold medal."

Cash feels the quality and depth of opposition in the women's draw is another obstacle in Osaka's bid for gold.

Wimbledon winner Ash Barty, beaten finalist Karolina Pliskova, former French Open champion Iga Swiatek and Aryna Sabalenka are scheduled to be among the highest-ranked competitors for Osaka at the Olympics.

Cash added: "There are a lot of good players too. Going back onto the hard court, I think that favours certain players who hit the ball hard like Sabalenka for instance.

"But there's 30 girls who really do think they can win a gold medal there and I think that's true. 

"So it's very hard to predict who will win, obviously Japan want Osaka to win, but with her being out, I think it's less likely than in a normal circumstance where she's playing matches. 

"But she's such a talent that she really could come out there and blast players away, so I wouldn't put it past her."

The Polish athlete was the highest-ranked seed in action in the women's singles in the Japanese capital and comfortably dispatched of Mona Barthel 6-2 6-2.

World number one Ash Barty gets her individual campaign underway on Sunday but the Wimbledon champion was a doubles victor on the first day of action on the tennis courts.

SWIATEK OUT TO ADJUST

Swiatek was on court for a little over an hour, breaking serve six times and firing down 13 winners to Barthel's eight.

The tough hot and humid conditions were a big talking point at Ariake Tennis Centre on Saturday, and Swiatek – whose father represented Poland as a rower at the 1988 Olympics – had her say.

"I'm pretty happy that I'm into the second round and for sure not only the temperature was hard, but also the sun because on one side it was pretty hard to serve," she said. 

"But we had to adjust quickly and change our toss, so that was hard, but you know I would say the players who can adjust quicker are going to be the best ones here."

KREJCIKOVA BENEFITS FROM DIYAS RETIREMENT

Eighth seed Barbora Krejcikova was 5-2 up against Zarina Diyas before her opponent had to withdraw with an ankle problem.

The Czech now meets Leylah Annie Fernandez in the second round. Fellow seeds Belinda Bencic (9), Anastasia Pavlyuchenkova (13), Maria Sakkari (14) and Elena Rybakina (15) all made it through round one.

But Kiki Bertens, the 16th seed, was sent packing 6-4 3-6 6-4 by Marketa Vondrousova.

BARTY REVELS IN TEAMING UP WITH CHILDHOOD FRIEND

Barty is fresh off her triumph at SW19 earlier this month, and the amiable Aussie started her Olympics adventure alongside long-time friend Storm Sanders.

The sixth feeds hammered home pair Nao Hibino and Makoto Ninomiya 6-1 6-2.

"Playing with my childhood friend in what is a dream for both of us is really cool. And to be here in some of the most unique circumstances I think ever for an Olympic Games, it's really awesome for us," Barty said.

"We're very grateful and thankful that we're able to be here to play and to experience what is really cool Games."

It has been a memorable week for Vondrousova, who knocked out cauldron-lighter and "face of the games" Naomi Osaka in round three.

One more hurdle still stands in her way in the form of ninth seed Bencic, who fought hard for a three-set triumph over Elena Rybakina.

VONDROUSOVA MARVELS AGAIN

Vondrousova has had a Games to remember and she was a 6-3 6-1 winner against heavily fancied fourth seed Svitolina, becoming the first female Czech to reach an Olympic singles final in the process.

It means the Czech Republic will have a women's singles competitor on the podium for the second straight Games after Petra Kvitova finished with bronze at Rio 2016.

Incredibly, Vondrousova did not even automatically qualify for these Games with Karolina Pliskova, Barbora Krejcikova, Kvitova and Karolina Muchova ahead of her in the qualifying pecking order.

Vondrousova opted to use her protected ranking, dating back to a wrist injury prior to the pandemic, meaning Muchova missed out. Though criticised at the time, she is the last of the four remaining.

TEARS FOR BENCIC

Switzerland has a proud history of tennis stars but neither the legendary Roger Federer nor the great Martina Hingis have won Olympic gold in a singles event. Bencic has the chance to do that, though.

She had to go the distance against Rybakina in a 7-6 (7-2) 4-6 6-3 victory, with Bencic fighting back from 5-2 down in the first set.

Eventually Bencic came through in two hours and 44 minutes and the tears poured as she made the final.

"My emotions right now... it's too high," Bencic told the ITF website. "To have a medal, it's the greatest thing. Even to be here as an athlete, in the Olympics, it's amazing."

It means Switzerland will medal for the fourth straight Games with Federer, Stan Wawrinka, Hingis and the recently retired Timea Bacsinszky all having medalled.

The last Swiss gold medallist was at Barcelona 1992 where Marc Rosset won the men's singles.

Elsewhere, singles world number one Ash Barty remains in the hunt for mixed doubles gold. She and partner John Peers defeated Greek pair Stefanos Tsitsipas and Maria Sakkari – winning on a 10-point tie-break after the first two sets were shared.

A thumping 6-3 6-1 victory against Russian Olympic Committee's Karen Khachanov was the perfect way for world number five Zverev to land the biggest title of his career.

He won 10 of the last 11 games of his semi-final against world number one Djokovic and carried that form into Sunday's title match, brushing aside the threat across the net.

It makes him Germany's first men's singles champion at the Olympics. Steffi Graf won the women's title as part of a calendar Golden Slam in 1988, and four years later Boris Becker and Michael Stich teamed up to take doubles gold.

For the man who won the ATP Finals in 2018 and reached last year's US Open title match, this marked a step forward in a career many expect will eventually feature grand slam titles.

He secured a swift break in the first set against Khachanov, who was outstanding in the semi-finals against Pablo Carreno Busta but could not impose his game in the gold-medal match.

Another break followed and the set was gone in 43 minutes.

The second set rushed by in a mere 36 minutes, with Zverev against striking early and never looking back.

He created two break points in the second game of that set, and although Khachanov saved them, a third soon followed and the Russian netted on the forehand.

The momentum was all one way and there was never a moment when Khachanov, ranked 25th by the ATP, looked as though he might pose some danger. 

Zverev gave himself a first match point when he punched away a backhand volley, and the glory belonged to the German when Khachanov slapped a forehand into the net on the next point.

BENCIC DENIED GOLDEN DOUBLE

Belinda Bencic was the surprise champion in the women's singles and the Swiss had a chance to land a second gold medal on Sunday when she and Swiss partner Viktorija Golubic lined up in the doubles final.

It was not to be for Bencic and Golubic, however, as they were soundly beaten by the prolific Czech pair of Barbora Krejcikova and Katerina Siniakova.

A 7-5 6-1 win for the reigning French Open champions meant Bencic and Golubic were left with the silver medal.

But there was little in the way of regret for the Swiss pair, with Bencic showing off both her gold and silver medals after the match, saying: "We are overjoyed. We will fly back on Monday with other medallists. It's a great feeling to know people are waiting and they acknowledge the medals we won for our country.

"The week here was incredibly beautiful. We experienced so many emotions, and it's great to go back and share all of these emotions with everyone at home.

"It's not just about the medals or the titles, it's about the memories you create that will last forever. To share this with Viki is unbelievable.

"The whole week I never felt like I was in a normal tournament or playing alone. She was alongside me the entire way. I always tell her we won this gold medal together as well. When we will be 80 years old and have a coffee, we will talk about this moment and I cannot wait for that."

There has been global concern expressed for the safety, whereabouts and wellbeing of Chinese player Peng, who has competed at three summer Olympic Games.

In December, Peng denied making an accusation of sexual assault against a Chinese government official, saying there had been "a lot of misunderstandings" about a post on social media in November.

That post on her Weibo account, since removed, contained sexual assault allegations against Zhang Gaoli, the ex-vice premier and member of the Chinese Communist Party's Politburo Standing Committee.

Amid concerns for Peng after the accusation, the head of the women's tennis tour, WTA chairman Steve Simon, said he struggled to believe she had sent him an email that claimed the allegations were false and that she was safely at home.

The WTA has since suspended all its tournaments in China.

International Olympic Committee (IOC) president Bach said in a news conference on the eve of the Winter Olympics opening ceremony that 36-year-old Peng was living in Beijing, and that she claimed to be allowed to move freely. He said the IOC would support Peng if she considered an "inquiry" into her circumstances necessary.

Bach's stance throughout has been that "quiet diplomacy" is required, and he did not deviate from that on Thursday. He explained Peng would enter the "closed loop" of the Games, which has been designed to separate the Olympics from the rest of Beijing during the ongoing coronavirus pandemic.

"The answer is, yes, we will have the meeting," Bach said, when the issue was raised in a news conference.

"I'm very happy and grateful to Peng Shuai that she will enter, in order to have this meeting, because she also wanted to have this. We discussed it in November."

Bach said the IOC had previously made contact with Peng "to get to know where she is and as far as possible how she is". He has already spoken to Peng via video link.

"What better way than to have a personal meeting," he added. "This is why already in the first meeting, I said I want to meet personally once I arrive in China, and this will happen.

"It is also not only a sign of respect, but a necessity to respect her and then to listen to her and how she sees the situation, how she wants to live her life. This is what we are step by step trying to find out.

"If she wants to have an inquiry, of course we would also support her in this, but it must be her decision. It's her life; it's her allegations. We have heard the allegations, and we have heard the withdrawal.

"We will have this personal meeting and there we will continue this conversation, and we will know better about her physical integrity and her mental state when we can meet in person. This was the objective of this initiative from the very beginning.

"We say it publicly we have this information, but so far only by video conference. This cannot replace the personal contact and appearance.

"We know from her explanations during these video conferences that she is living here, in Beijing. She's reporting she can move freely, she's spending time with her family and friends, and now we will be able to do the next step in a personal meeting to convince us of her wellbeing and her state of mind."