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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."