Coco Gauff followed up Olympic disappointment with an early Canadian Open exit after being stunned by Diana Shnaider in Toronto.

World number two Gauff suffered early eliminations at the Paris Olympics last week after falling in the singles, doubles and mixed doubles.

The number one seed was then downed 6-4 6-1 by her fellow 20-year-old, who secured the first top-10 win of her career to seal a maiden appearance in the quarter-finals of an ATP 1000 event.

"Sometimes I question like whether I should have played or not," Gauff said, "But at the end of the day I wanted to test myself and see if I would be able to, how I would do being mentally tired a little bit and physically fatigued.

"I said going into the tournament I didn't have high expectations, but I wish I could have competed better today, even if it resulted in a loss. I don't think I competed well."

Shnaider is a remarkable 39-14 across all professional matches for the year, winning three titles in Hua Hin, Thailand (hard) in February, Bad Homburg (grass) in June and Budapest (clay) in July.

"I know Coco is very physically prepared for everyone on tour, and she's running very well, she's covering all of the balls and all the angles on the court," Shnaider said.

"So when there were long rallies and I was winning them I was like, 'Wow, I just beat Coco in long rallies. I am good'. I mean, I tried to play it cool, but inside I was like, 'Yes! I made it!'"

Meanwhile, third seed Aryna Sabalenka eased past British number one Katie Boulter for a routine 6-3 6-3 triumph in Canada.

Sabalenka will next face Amanda Anisimova, one of five Americans in the last eight alongside defending champion Jessica Pegula, Peyton Stearns, Emma Navarro and Taylor Townsend.

Since the beginning of 2020, Sabalenka has reached 17 WTA 1000 quarter-finals, a feat only matched by world number one Iga Swiatek for the most at WTA 1000 events in that time.

Defending Cincinnati Open champion Novak Djokovic will not take part in this year's tournament following his success at the Paris Olympics. 

Djokovic, who claimed his first gold medal at Roland-Garros against Carlos Alcaraz last week, has withdrawn from the US Open tune-up event in the United States. 

The Serbian became only the second player after Andre Agassi in the Open Era have won all four Grand Slams, the gold medal at the Olympics and the ATP Tour Final with his win over the Spaniard in the French capital. 

Djokovic also became the oldest player (37y 74d) to secure the gold medal in either the men’s or women’s singles at the Olympics, since the sport’s reinstatement as an Olympic event in 1988.

However, he has chosen to focus on the upcoming US Open, a competition he won 12 months ago against Daniil Medvedev to claim the latest of his 24 grand slam titles. 

"We certainly understand that it is a quick turnaround from his Olympic triumph to come to Cincinnati," Tournament Director Bob Moran said in a news release.

"His title run here last year was so memorable. We are eager to see him on court again soon."

Last year in Cincinnati, Djokovic claimed the title in three sets against Alcaraz, claiming his second win over the Spaniard in their fourth meeting. 

The Serbian's victory over Alcaraz at the Games took his record to 5-4 over the world number three having lost in the Wimbledon final the previous month. 

Djokovic's withdrawal moves Frenchman Giovanni Mpetshi Perricard into the draw.

Stefanos Tsitsipas has slammed his father's coaching style after suffering a shock straight-sets defeat at the Canadian Open on Thursday.

The 25-year-old was beaten 6-4 6-4 by Kei Nishikori, the world number 576, as he secured the scalp of the tournament so far in Montreal.

It follows a disappointing Olympic Games for Tsitsipas, who was knocked out by eventual winner Novak Djokovic in the quarter-finals.

He also struggled at Wimbledon last month, suffering defeat to Emil Ruusuvuori in the second round.

Now, he has hit out at his coach and father, Apostolos Tsitsipas, who he asked to leave midway through Thursday's match, for seemingly not reaching the standards he is looking for.

"I need, and I deserve, a coach that listens to me and hears my feedback as a player," Tsitsipas said.

"My father hasn't been very smart or very good at handling those situations. It's not the first time he has done that. I'm really disappointed at him.

"I really don't know right now if I'd consider any changes, but I'm really disappointed.

"The most important thing for a player is to have direct and good feedback from a coach. The coach is not the one holding a racket. The player is the one trying to execute a game plan.

"It's a collaborative work that you put in together. It has to be reciprocal in order for me to try to develop my tennis. It's something I don't want to get stuck at that."

Naomi Osaka crashed out of the Canadian Open with a straight-sets defeat to Elise Mertens in the second round on Thursday.

The Belgian held her nerve for her second win over Osaka this year, beating her 6-3 6-4 in Toronto to set up a meeting with Liudmila Samsonova in the round of 16.

Osaka was caught out by making errors from the baseline and failed to gain any momentum as her preparation for the US Open took a hit with her early exit.

Despite the defeat, the former world number one remained upbeat about her performance as she looks to build on this result.

"I feel like I could have put a bit more on the court, a bit more from the baseline shots," Osaka said. "I got a bit caught up in the idea of being consistent and staying in the exchanges, I don't know.

"I'm happy with how I fought despite not winning, but I feel like I learned a lot.

"Unfortunately, I have always suffered a lot from my perfectionism, and I also tend to doubt myself a lot, but I think it's necessary to go through this process and have tough losses from which you can learn a lot about yourself.

"I know there will be many tough defeats like this one, but hopefully, I hope to be back in the top ten soon." 

Data Debrief: Fight fizzles out

Osaka struggled to gain a foothold in the match, losing her serve four times while only earning two breaks in return. 

She won just 37% of her second serve points (10/27) and failed to win more than two games in a row as Mertens edged out of her reach. 

Jannik Sinner began his defence of the Canadian Open title with a routine 6-2 6-4 victory over Borna Coric in Montreal.

Sinner, who won his first ATP Masters 1000 crown at the 2023 event and has since won the Miami Open and his first grand slam at this year's Australian Open, was victorious within one hour and 37 minutes at the Omnium Banque National presente par Rogers.

The Italian, who missed the Paris Olympic Games with tonsillitis, showed no signs of rust on his first hard-court outing since his Miami triumph in March.

He stuck the ball sweetly from the off and only dropped four points behind his own first serve, with breaks in the third games of both sets putting him on course for victory.

He will face 15th seed Alejandro Tabilo or Lorenzo Sonego in the last 16 as he prepares for a potential title tilt at the US Open.

Speaking after his win, Sinner said: "I've been here for a little bit so I'm maybe a bit more used to the conditions, but still, I'm very happy about the performance.

"It was a very tough match. Even if you watched the score, it felt closer for sure. 

"I had to save a break point in the second set and if he makes that one it could potentially change the match. It was a very good mindset today and I'll try to keep going."

Data Debrief: Forty and counting for Sinner

Sinner's victory, coming at the age of 22 years and 357 days, made him the youngest player to achieve 40 successive wins against players ranked outside the ATP's top 20 since Rafael Nadal, who completed that feat aged 22 years and 285 days at Indian Wells in 2009.

Daniil Medvedev suffered a rare hard-court loss to an opponent outside the world's top 20 as Alejandro Davidovich Fokina sent him crashing out of the Canadian Open in the last 32.

Third seed Medvedev was beaten 6-4 1-6 6-2 by world number 43 Davidovich Fokina, the Spaniard coming through a one-hour, 56-minute contest in Montreal.

Davidovich Fokina, who reached the semi-finals of the tournament in 2023, will now face either Karen Khachanov or Matteo Arnaldi for a place in the quarter-finals.

It was only Medvedev's third hard-court defeat to an opponent ranked outside the ATP's top 20 since the start of 2023, with the others both coming against Sebastian Korda.

Medvedev was not the only player to be on the receiving end of an upset on Thursday, as Japan's Kei Nishikori beat Stefanos Tsitsipas 6-4 6-4 for his first top-20 win since 2021.

However, things were far more comfortable for world number four Alexander Zverev, who crushed Jordan Thompson by a 6-1 6-1 scoreline to reach the third round.

Zverev won a huge 95% (18/19) of points behind his first serve, also slamming 20 winners past Thompson, who had previously led the duo's head-to-head series 2-1.

Coco Gauff continued her preparations for the defence of her US Open title by reaching the next round of the Canadian Open, beating China's Yafan Wang in straight sets.

Gauff needed just under an hour and a half to get the job done in Toronto, emerging a 6-4 6-4 victor to bounce back from her disappointment at the Paris Olympics. 

The world number two started shakily, saving three break points in the third game before converting a break of her own to lead 3-1 in the opening exchanges. 

Wang would fight back, however, winning the next three games on the bounce, but the American would rally to take the first set. 

It looked as though Gauff would cruise to victory after taking a three-game lead, but her Chinese opponent would show her powers of recovery once more, levelling the encounter soon after. 

The pair would trade blows for the remainder, with Gauff proving too strong for Yang late on, claiming the triumph with a love game on serve. 

Gauff will face Diana Shnaider for a place in the quarter-finals following the Russian's triumph over Magdalena Frech earlier in the day. 

Data Debrief: Gauff fights off spirited Wang

While Gauff was far from her best in Toronto, she adjusted well to the hard surface having competed on the clay courts of Roland-Garros at the Olympics. 

The American impressed on serve, registering six aces throughout the contest while also winning 65% of her first-serve points. 

Naomi Osaka said her straight-sets victory over Ons Jabeur in the Canadian Open demonstrates her growing confidence.

The four-time grand slam champion defeated world number 16 Jabeur 6-3 6-1 in her first-round match in Toronto.

Osaka’s victory follows her early exit in the Olympics where she lost in straight sets to Germany’s Angelique Kerber last month at Roland-Garros.

Away from the clay courts, the Japanese player felt the surface and her opponent brought out the best in her in Canada.

“Everyone knows I really love hard court,” said Osaka. “So I don’t know, I wasn’t really thinking too much.

"It felt very instinctual and honestly when I play the best players like Ons I tend to play better."

Now, Osaka believes she is beginning to build momentum again after her hiatus.

“I think if you’ve been following my journey a little, I go through mountains and hills. But now I’m feeling quite confident in myself as a person and a player and I think that showed a little,” she explained.

“Hopefully I can continue to play a lot more matches, but I think I just really love playing tennis and it’s been an honour to play such a great match in front of everyone.”

Coco Gauff is not expecting to win the Canadian Open as she manages the transition from clay to hard courts following the Olympics. 

Gauff fell short of a medal last month, losing to Donna Vekic in the singles while bowing out of the mixed and women's doubles with Jessica Pegula and Taylor Fritz. 

The world number two is one of the headline names at the WTA event in Toronto after a number of high-profile players, including world number one Iga Swiatek and Wimbledon champion Barbora Krejcikova, dropped out.

Her opening game of the tournament sees her face Yafan Wang, however, Gauff has tempered expectations as she prepares to defend her US Open crown at Flushing Meadows.

"I am not going into this expecting to win or anything. That would be great and it's the goal, but being realistic I was on clay three days ago," Gauff said. 

"I'm just trying to use this to see where I am and what I need to do to get ready for the US Open."

After her frustration in Paris, Gauff will have to wait another four years to win an Olympic medal, but has the comfort of the next Games being held on home soil in Los Angeles.  

And despite suffering disappointment in all three Olympic disciplines (singles, doubles and mixed doubles) this year at Roland-Garros, the American put her name forward to compete across the board again in 2028. 

"I would still do all three [events] again if that’s a possibility in '28," Gauff said. 

"I mean it's four years from now, I'll be 24, so I will still be on the healthier and younger side of things, and especially if the draw size for mixed is that small, I feel like that's one everyone wants to play.

"I had a great experience, from not being able to go to Tokyo to being able to go here, I just feel like LA, I'll hopefully be on the podium.

"I just feel like that's what my life consists of, having a disappointing result and then the next time is the best thing in the world."

Iga Swiatek is sure of her place at the WTA Finals after it was announced the world number one had qualified for season's grand finale.

The season-ending tournament will take place in the Saudi Arabian city of Riyadh for the first time, and will be held in November.

Swiatek, who won bronze at the Paris Olympics last week, has become the first player to secure her place at the Finals.

The 23-year-old has scooped five titles in 2024, including the French Open, which she has won four times.

“It's a great feeling to qualify for the WTA Finals for the fourth year in a row," said Swiatek, the reigning WTA Finals champion.

"I hope that the performances of the eight best players of the season will give a lot of joy to the fans all over the world."

Swiatek will become the youngest player to appear at the WTA Finals for four consecutive years since Victoria Azarenka (2009-2012).

After been knocked out early on in 2021, Swiatek reached the semi-finals in Fort Worth in 2022 before triumphing in Cancun last year.

Naomi Osaka put her Paris Olympics disappointment behind her as she eased to the next round of the Canadian Open in a straight-sets win over Ons Jabeur.

Osaka fell at the first hurdle to Angelique Kerber at Roland-Garros last month, but was back to her best as she emerged a 6-3 6-1 victor in Toronto. 

The four-time grand slam champion wasted no time in stamping her authority on proceedings, earning a two break points to take a 3-0 lead early on. 

And that would prove decisive, with the world number 95 seeing out the rest of her service games, closing out the first set with a love game. 

Jabeur would have no response to Osaka's stunning display, with the Japanese finding another pivotal break before winning the remaining three games to confirm the win. 

Osaka will face Elise Mertens in the round of 32 after the Belgian beat Katie Volynets in straight sets earlier in the day. 

Data Debrief: Osaka over Olympics disappointment

Having suffered disappointment in Paris, Osaka responded in emphatic style upon her return to the court and will want to continue that momentum moving forward. 

Osaka converted all three of the break points she had, winning all eight of her service games. 

It proved to be a difficult day at the office for Jabeur, who uncharacteristcally served seven double faults throughout the contest compared to Osaka's four. 

Rafael Nadal has withdrawn from the US Open, claiming he would be unable to give 100% effort should he participate.

Nadal, who played in both the singles and doubles at the Paris Olympics, skipped Wimbledon earlier this year in order to feature at Roland-Garros.

However, after losing to Novak Djokovic in the singles and then failing to reach the medal matches alongside Carlos Alcaraz in the doubles, Nadal has elected to miss this season's final major and instead ready himself for the Laver Cup, which will take place in September.

It means the 38-year-old, who has triumphed four times at Flushing Meadows, may well have featured at the last major of his extraordinary career.

In a post on social media, Nadal wrote: "I have decided not to compete at this year’s US Open a place where I have amazing memories.

"I will miss those electric and special night sessions in NYC at Ashe, but I don't think I would be able to give my 100% this time.

"Thanks to all my US fans in particular, will miss you all and will see you another time.

"Best of luck to all for the always amazing US Open! My next event will be the Laver Cup in Berlin."

Naomi Osaka quipped she has been "stalking" Iga Swiatek after her first-round defeat at the Olympics.

Four-time grand slam champion Osaka, now ranked at world number 95, lost in straight sets to Germany's Angelique Kerber on Court Philippe-Chatrier in Paris.

Former world number one Osaka returned to tennis earlier this year after giving birth in July 2023.

Now she hopes she can climb back up the rankings by watching others on the tour, and world number one Swiatek has been high on her list.

"I was stalking Iga. I was watching her practice at the Olympics, and for me, that's something I want to do more, watch the great players, because there's always something I can pick up on," Osaka told reporters ahead of the Canadian Open.

"I know she has one of the best footwork skills on the WTA. I'm just trying to copy a little bit." 

The Japanese player found her Olympics experience more enjoyable than three years ago at her home Games, where she lit the Olympic flame.

"I would say in Tokyo [2020], I was definitely really stressed. In Paris, I felt a lot more fun. And obviously there were spectators there, so it was a lot different," reflected the 26-year-old.

"In Paris, I felt a lot more fun. And obviously there were spectators there, so it was a lot different. But I didn't stay in the village, so that is something that I regret a little bit, not to have the full experience. Overall, I think it was it was fun. Hopefully, I can play in LA [in 2028]."

Osaka has naturally faced challenges in her return to sport following pregnancy, which has made her presence at the Olympics a year on from giving birth impressive in itself.

"Honestly, after pregnancy, I wasn't really sure how my movement would be," said Osaka.

"I remember being on the track at UCLA [University of California, Los Angeles] and almost crying in frustration because I felt like I couldn't run as fast as I wanted to.

"It felt like I was in a body suit that was not performing the way I wanted. Now, to be here, is a really incredible achievement."

Having a daughter has also given Osaka a new outlook on her sport.

"I lost in the Olympics, I was, of course, really devastated," she explained. "But I was just surrounded by my team.

"Then I went back home, and I saw my daughter, and she's just happy to be alive. She's happy that I'm her mom and it just gave me a lot of motivation.

"I feel like when I was younger I was searching for my purpose in life. The way I grew up, my only purpose was tennis. Then obviously taking the year that I had as a break, it let me see that there are so many different things in life and it's a beautiful world."

Holger Rune made a strong start at the Montreal Open as he defeated Roberto Bautista Agut 6-2 3-6 6-2.

Rune, who withdrew from the Olympics due to a wrist injury, had been set to face Milos Raonic in the first round.

However, Raonic withdrew just moments before the match was due to start, so lucky loser Bautista Agut filled in.

It left Rune having to swiftly adapt to a new opponent, but despite a wobble in the second set, the Dane was generally in control throughout Tuesday's contest.

"It was a challenge for sure," Rune said. "It's never easy coming back after a little break — not the longest break, but for me, I'm very young and luckily I haven't been injured much. It was difficult but I think I managed to find the rhythm quickly.

"It was kind of tricky. It's two completely different game styles. I kind of had to adjust from one tactic to another in five minutes. Luckily, I played Bautista before so I had a clue, and obviously he's been on Tour for many years, so I know him very well.

"It was not easy. I was expecting a big server and trying to manage to get in the rallies with Milos, and now it was a completely different story. I needed to attack much more and play on my terms."

Next up for Rune, who has won 13 of his 15 opening-round matches this season, is a tie against Pablo Carreno Busta.

Data Debrief: Scandi style

Since the format’s inception in 1990, world number 17 Rune is now the fourth Scandinavian player to claim 30+ wins from an opening 50 ATP Masters 1000 matches.

He joins Stefan Edberg (41), Magnus Gustafsson (32) and Casper Ruud (31) on that list.

Victoria Azarenka reached a career milestone with her straight-sets victory in the opening round of the Canadian Open on Tuesday.

She overcame Anastasia Pavlyuchenkova 6-2 6-2 to book her place in the round of 32 in one hour and 17 minutes in Toronto.

In the process, Azarenka became the first player to claim 150 straight-set wins at WTA-1000 events, excluding retirements, since the format's introduction in 2009.

The Belarusian already had the most straight-set wins at WTA-1000 events, but now has 18 more than second-place Agnieszka Radwanska (132).

Azarenka is chasing her first title at the Canadian Open, having reached the semi-finals twice in her previous 11 appearances.