Coco Gauff won her Olympic singles debut with a dominant straight-sets victory over Ajla Tomljanovic on Sunday.

The American cruised through in just 57 minutes on Court Philippe Chatrier, winning 6-3 6-0 in the evening session.

Gauff raced into a 3-0 lead in the first set and did well to hold off the Australian's fightback after trading breaks for the next four games. She soon regained her advantage at 5-3 though, before winning the final game to love to take the lead.

Gauff eased through the second set with little fuss and Tomljanovic had no answers as she finished the game on the wrong end of a bagel.

Next up for Gauff is Argentina's Maria Lourdes Carle, who routed Tatjana Maria 6-0 6-0 on Sunday.

Data Debrief: Gauff gets off to perfect start

Gauff missed the Tokyo 2021 Olympics through illness, and she could not have asked for a better start in Paris after winning both her doubles and singles matches.

The 20-year-old won the final eight games in a row en route to her dominant win, breaking Tomljanovic's serve six times throughout the match.

Novak Djokovic is confident he can recover from a wrist injury in time for his Australian Open title defence.

The world number one struggled with a problem with his right wrist and was not at his best in a straight-sets defeat to Alex de Minuar in the United Cup in Perth.

Djokovic, bidding for a record-extending 11th men’s Australian Open singles title, lost 6-4 6-4 to world number 12 De Minaur as Australia beat Serbia 2-0 in their quarter-final in the mixed team event.

“Congrats to De Minaur, he was very solid from the beginning, just played a great match and deserved to win,” Djokovic said in a post-match interview.

“I was not at my level, but it was just one of these days where you didn’t feel your best on the court and your opponent played very well, that’s all I can say.

“I have enough time to get myself in the right shape for the Australian Open and that’s what matters the most at this point.

“I think I’ll be OK, to be honest, but it did have quite an impact, particularly on the forehand and serve.

“But, again, I don’t want to be too much time talking about it and taking away credit for the victory from De Minaur, he was just very solid as he always is.

“Congrats to him and to the Australian team. It is what it is for us I guess and I move on with my thoughts in Melbourne.”

Djokovic will find out his first-round opponent at Melbourne Park when the singles draw for the first grand slam of the year takes place on Sunday.

The 36-year-old needed a medical time-out for his wrist problem in his previous United Cup match against the Czech Republic’s Jiri Lehecka, which he won in three sets on Tuesday.

Against De Minaur he twice needed treatment, first after holding serve to lead 4-3 in the opening set and again after he had been broken to trail 5-4.

“I knew I was probably not going to be at 100 per cent physically, emotionally, mentally game-wise in the opening week of the season,” Djokovic added.

“Neither did I expect that or want that to be honest. It’s all a part of the build-up for the Australian Open.”

Despite Djokovic’s fitness concerns, De Minaur produced an impressive performance to seal one of the biggest wins of his career in just over an hour-and-a-half.

Ajla Tomljanovic followed De Minaur’s win by beating Serbia’s Natalija Stevanovic 6-1 6-1 to clinch Australia’s semi-final place.

Serena Williams says the chances of her returning to the court are "very high", despite declaring her intention to step away from tennis before the US Open last month.

Though she deliberately avoided saying she would retire prior to the tournament, instead saying she planned to "evolve" away from the sport, many believed Williams' third-round exit at Flushing Meadows last month was the last time she would be seen playing competitive tennis.

Her defeat to Ajla Tomljanovic was met with the kind of fanfare that suggested she was calling it a day on an illustrious career that included 23 grand slam titles, the second most in history behind Margaret Court.

But Williams implied she could yet step on the court again when speaking at a TechCrunch Disrupt event in San Francisco on Wednesday.

In quotes collected by the San Francisco Standard, Williams said: "I am not retired.

"The chances [of me returning] are very high. You can come to my house and [see] I have a court."

Victoria Azarenka has booked a clash with the top seed of the Guadalajara Open after defeating Elina Avanesyan 6-4 6-2 in Monday's opening round.

In the last event of the season before the WTA Finals, Belarus' Azarenka was too strong with her return game for her Russian opponent, winning 53 per cent (32-of-60) of her return points while capitalising on five-of-seven break point opportunities to earn a shot at world number eight Paula Badosa.

While Azarenka has no chance of qualifying for the WTA Finals – with only the top-eight players in the rankings making it through – Belinda Bencic is one of the players who can sneak in with a great result this week.

Needing to make the semi-finals to have a chance, she got off on the right foot with a 7-5 6-7 (10-12) 6-3 win against Leylah Fernandez in her opening match.

Petra Kvitova can also qualify if she reaches the final, and she started without issue, defeating Bernarda Pera 6-3 7-5.

Ekaterina Alexandrova had an outside chance of claiming a WTA Finals spot if she won this tournament, but she was the victim of the day's biggest upset, falling 6-4 7-6 (10-8) to Camila Osorio.

At 22nd in the world, Liudmila Samsonova is the lowest-ranked player in the field with a mathematical chance at qualification, but she is a step closer after handling Kaia Kanepi 6-1 7-5.

Despite Fernandez's earlier loss, it was a strong day for the Canadians, with Bianca Andreescu proving too good in her 6-2 6-4 victory against Jil Teichmann, and Rebecca Marino also only needed two sets to defeat Ann Li 6-2 7-6 (7-2).

China's Lin Zhu came from a set behind to beat France's Alize Cornet 3-6 6-3 6-4, while Ukraine's Marta Kostyuk had a much quicker result in her 6-1 6-3 triumph over Belarus' Aliaksandra Sasnovich.

World number 34 Elise Mertens had no problems in one of the biggest mismatches of the day as she defeated world number 185 Asia Muhammad 6-3 6-2, and Sloane Stephens needed only 54 minutes to advance 6-0 6-2 past Linda Fruhvirtova.

In the last match of the night, Mexico's top chance Fernanda Contreras Gomez was eliminated by Alja Tomljanovic 6-2 6-1.

Iga Swiatek is through to the quarter-finals of the Ostrava Open after Ajla Tomljanovic retired hurt in their second-round match on Wednesday.

The world number one had won the first set 7-5, but her Australian opponent was forced to concede at 2-2 in the second.

Swiatek is now the female player with the most wins in a single year (58) in the last five seasons. Former world number one Ash Barty recorded 57 victories in 2019.

The second seed in Ostrava is out after Paula Badosa was beaten 7-6 (7-4) 6-4 by Petra Kvitova in front of a delighted Czech crowd, while Elena Rybakina is also through to the last eight after coming from behind to win against Aliaksandra Sasnovich 6-7 (5-7) 6-4 7-5.

Wednesday's two other matches saw more success for Czech participants as Karolina Muchova beat seventh seed Beatriz Haddad Maia 6-4 6-4, while Barbora Krejcikova defeated Shelby Rogers 6-2 6-2.

There was less Czech joy at the Jasmin Open in Tunisia, where Katerina Siniakova was beaten 7-5 6-2 by Claire Liu.

Elsewhere, number three seed Alize Cornet eased past Harriet Dart 6-3 6-4, Elise Mertens came from behind to beat Despina Papamichail and Diane Parry went through against French compatriot Lucrezia Stefanini after the latter retired hurt in the second set.

Ons Jabeur believes she can win a major title following her Wimbledon run to the final, having clinched a spot in the US Open semi-final with a straight-sets victory over Ajla Tomljanovic on Tuesday.

The world number five secured her spot in the last four in one hour and 41 minutes, winning 6-4 7-6 (7-4), having trailed 5-3 in the second set.

The win was Jabeur's 43rd this season, trailing only world number one Iga Swiatek, and comes after she lost to Elena Rybakina in July's Wimbledon decider, fueling her belief that she can secure a breakthrough grand slam title.

"I believe in myself after Wimbledon," Jabeur said during her an on-court interview. "I know that I have it in me to win a [major] final. And here I am in the semi-finals."

Jabeur had reached the quarterfinals at the 2020 Australian Open and 2021 Wimbledon Championships, with her recent runner-up finish proving a breakthrough.

"I think the fact that I broke that barrier of being in the quarterfinals all the time, that did help with my confidence," she said.

"Knowing that I could make finals in grand slams really helped my game, just trying to build that experience to go into second weeks in grand slams.

"It was very tough coming here, you know, just the hard court season like wasn't that great for me. So I was trying to build more and more confidence on hard courts.

"Wimbledon helped a lot, for sure."

The 28-year-old Tunisian has made history several times, the latest being becoming the first African or Arab woman in the Open Era to reach the US Open semifinals.

On a personal level, she has now also reached the second week in all four major tournaments.

"I’m just trying to do my job here, hopefully I inspire more and more generations from Africa," Jabeur said. "It really means a lot to me."

Ons Jabeur advanced through to her first US Open semi-final after defeating the in-form Ajla Tomljanovic 6-4 7-6 (7-4) on Tuesday.

Jabeur, the world number five, became the first woman from Africa to make the last four at Flushing Meadows after a powerful display in the quarter-finals accounted for an opponent who has belatedly started to pose problems at grand slams.

Continuing a strong season of her own, in which she played a first major final at Wimbledon, Jabeur broke twice in the opening set as Tomljanovic failed to fully capitalise on her wayward serving, instead getting in her own way with four double-faults to no aces.

It meant the Tunisian threatened to run away with the match when she secured another break in the first game of the second set, but Tomljanovic fought back in what developed into a back-and-forth struggle, with six breaks of serve split evenly through the first nine games.

Although that theme initially continued in the tie-break, with the first four points all going against the serve, Jabeur finally found some big serves when it mattered most to finish the job.

A semi-final against either Coco Gauff or Caroline Garcia now lies before Jabeur, who had not previously gone beyond the third round in New York.

Data Slam: Jabeur powers through

Jabeur lacked accuracy with her serve – landing 40 per cent of her first serves across the match – but was dominant when she was able to keep it fair, converting nine of her 11 accurate first serves in the opener to illustrate the significant power gap between the two women.

ACES/DOUBLE FAULTS

Jabeur – 4/2
Tomljanovic – 1/9

WINNERS/UNFORCED ERRORS

Jabeur – 29/30
Tomljanovic – 12/24

BREAK POINTS WON

Jabeur – 5/6
Tomljanovic – 4/6

Coco Gauff dispatched Zhang Shuai in straight sets to become the youngest US Open quarter-finalist in 13 years.

The 18-year-old American fan favourite won 7-5 7-5 on Sunday, sealing her place in the last eight.

Gauff's victory makes her the youngest player to have reached the quarters at Flushing Meadows since Melanie Oudin in 2009.

Oudin, another American, was 17 at the time, and lost her last-eight tie to eventual runner-up Caroline Wozniacki.

Caroline Garcia is next up for Gauff, who will face either Ons Jabeur or Ajla Tomljanovic should she overcome the US Open quarter-final debutant.

Australia's Tomljanovic followed up her defeat of Serena Williams with a 7-6 (10-8) 6-1 win over Liudmila Samsonova, snapping the Russian's 13-match winning streak and reaching her second career grand slam quarter-final in the process.

World number five Jabeur, meanwhile, made history by becoming the first North African woman to make the US Open quarter-finals in the Open Era.

She is the third woman from the African continent to do so, with South Africans Maryna Godwin (1968) and Amanda Coetzer (1994, 1996 and 1998) having previously achieved the feat. Jabeur defeated Veronika Kudermetova 7-6 (7-1) 6-4.

Ajla Tomljanovic explained she just had to block out the noise surrounding Serena Williams in order to progress at the US Open.

Williams' called time on her illustrious career following Friday's 7-5 6-7 (4-7) 6-1 loss to Tomljanovic, though did leave the door open to a possible return.

The 40-year-old had announced her impending retirement last month in Vogue, and before each of the three matches she played at Flushing Meadows, the tournament organisers paid tribute to the 23-time grand slam champion.

Williams had the backing of the crowd against Tomljanovic, who knew she had to cut through the background noise and focus on her game.

"I'd say the biggest thing was just to block out all the noise. At the end of the day I tried to keep it simple," she said.

"It's just another tennis match for me. I'm happy to be in the third round and have a great opportunity to play on Arthur Ashe. It's what I dreamed of when I was a kid. Just not make it bigger than it is because everyone else already made it huge.

"From the first moment I walked on court, I didn't really look around much. I was completely in my own little bubble."

Tomljanovic will face Ludmilla Samsonova in the next round and is already putting her win over Williams to one side.

"It's already kind of in the past. I mean, I'm happy I won, I actually think a little too quickly about the next one! I never feel like I have a problem with that. I have more of an issue chilling out and taking it easy the next day," she said.

Williams did not bow out without a fight, saving five match points in the deciding set before finally falling short.

"I stopped counting after the second [match point]," Tomljanovic said. "You know what, every match point she saved, it was all credit to her. I didn't feel like I did much wrong.

"I had this weird calmness because I felt like if I get broken, I mean, so what? Serena broke me. Wow, I'm just like the next person she broke when she's down 5-1.

"I know she comes up with her best tennis when she's in the most trouble. I didn't feel like I'm choking it away or something. I just kept calm and actually took a page of her book."

Ajla Tomljanovic had conflicting emotions after beating Serena Williams, as she admitted she felt like a "villain".

Williams' called time on her illustrious career following Friday's 7-5 6-7 (4-7) 6-1 loss to the Australian, though did leave the door open to a possible return.

The 23-time grand slam champion did not let it go easy, clawing back five match points before Tomljanovic finally clinched the deciding set.

While Tomljanovic is sad to see Williams go, she could not say she was sad to have won, sealing a place for herself in tennis history in the process.

"No one's going to pronounce my name right," she quipped after it was suggested she would now be the answer to a common trivia question regarding Williams' final opponent.

"That's going to suck. I don't think I've of been part of tennis history [before], so that's pretty cool.

"I do feel a little bit like the villain. Like I said in Cincinnati, I really did want to play Serena before she retired. If I was the loser today I'd probably be really sad. I don't want to say I'm sad, but just conflicted.

"Probably the most conflicted I've ever felt after a win. During the match I was so eager to win. I mean, I wanted to win as much as the next person because I didn't look at her like, 'oh, Serena, her last tournament'. 

"But then when it ended, it almost didn't feel right. When she started talking about her family and everything, I got emotional because I can relate to having a strong bond with your family.

"When she said that she wouldn't be there if it wasn't for them, I relate to that a lot. Just the whole moment after was just tough to handle a little bit."

Asked what Williams meant to her, Tomljanovic replied: "Growing up I didn't really have idols, but Serena and Venus [Williams] were just so good that I looked up to them the most, I'd say.

"What always drew me to them was their bond with their family, like the togetherness. They always spoke about that, like it was so important to them. I can relate to that because I'm very close to my family and I wouldn't be where I am without them.

"From a young age I remember seeing them with their dad and thinking that's kind of like my story a little bit. Just the fact that you don't have to have anything other than supportive family, a dream, and just will and passion and love for the game to make it. Not just make it, but what she's achieved is absolutely incredible.

"I don't know if it's ever going to be repeated while I'm still around. I still have years left in me. I want to dream bigger than I have so far because that's what she embodies."

Williams bows out with the most grand slam titles in the Open Era, though one short of Margaret Court's all-time record of 24.

Serena Williams hinted that she will return to the court at some point in the future after going down in the third round of the US Open against Ajla Tomljanovic on Friday.

Williams, who saved five match points before eventually succumbing in the three-plus hour marathon, gave an emotional on-court interview where she thanked her family, but also highlighted that she felt like she was getting better as the tournament wore on.

When asked conclusively if this was her final US Open, she was non-committal, saying "you never know".

She took the insinuation that she is not finished playing a step further during her sit-down press conference, laying the breadcrumbs for another go around at the Australian Open.

"I don't know [what it would take to play again] – I'm not thinking about that. I always did love Australia, though," she said with a smile.

"But yeah, you know what, I've come a long way since last year at Wimbledon. Just not sure if that was my last moment or not. Making it a different moment I think is much better.

"And it takes a lot of work to get here. Clearly I'm still capable. It takes a lot more than that. 

"I'm ready to, like, be a mom, explore a different version of Serena. Technically in the world I'm still super young, so I want to have a little bit of a life while I'm still walking."

When asked what she thinks her life will be like moving forward, Williams said she is excited to be able to spend more time with her daughter, and that karaoke is on the agenda.

"I'm definitely resting tomorrow, and then probably spending some time with my daughter," she said. "I'm a super hands-on mom. I've been with her almost every single day of her life, minus two days or three days.

"It's been really hard on her, my career. So it will be, you know, nice just to do that and spend some time with her, do things that I never really have done or had an opportunity to do. I have such a bright future ahead of me, I don't know.

"Also, I'm kind of at an advantage because COVID happened. I think everyone shut down for a year, and we kind of got to see what our lives would be like if we weren't playing tennis. 

"Then I got injured last year, so I took off literally a year. So I got to see, again, like, what every day would be like to wake up and not have to go to the gym.

"So I don't know. I think I'm definitely probably going to be karaoke-ing tomorrow."

Touching on how she would like her career to be remembered, Williams said her unique passion and fire is at the forefront.

"I mean, there's so many things to be remembered by," she said. "Like the fight. I'm such a fighter. 

"I feel like I really brought something, and bring something, to tennis. The different looks, the fist pumps, the just crazy intensity. I think that obviously the passion, I think, is a really good word.

"Just continuing through ups and downs. I could go on and on. But I just honestly am so grateful that I had this moment, and that I'm Serena."

Serena Williams was emotional during her post-match interview in the sold-out Arthur Ashe Stadium after her loss to Ajla Tomljanovic in the third round, thanking her family for their decades of support.

Williams ended up going down in a match that lasted three hours and seven minutes, with a 15-minute final game where Williams saved five match points illustrating her fighting spirit down to the last moments.

If this is her final US Open – which she was hesitant to confirm – she will finish with the most main draw wins ever at the tournament with 108, and her 23 grand slam titles are also the most of all-time.

Speaking on the court after Tomljanovic gladly ceded the floor to the legend, Williams turned her attention immediately to her family as she reflected on the journey to this point.

"Thank you, Daddy. I know you're watching," she said as she began to tear up. "Thanks, Mom… I thank everyone that's here, that's been on my side so many years, decades. Oh, my gosh, literally decades.

"But it all started with my parents – they deserve everything. So I'm really grateful for them. These are happy tears, I guess. I don't know.

"And I wouldn't be Serena if there wasn't Venus, so thank you, Venus. She's the only reason that Serena Williams ever existed."

She added: "It's been a fun ride. It's been the most incredible ride and journey I've ever been on, I mean, in my life.

"I'm just so grateful to every single person that's ever said 'go, Serena' in their life. I'm just so grateful."

When asked if this would definitely be her last US Open, Williams was hesitant due to how well she performed, and left the question unanswered.

"I mean, I'm literally playing my way into this and getting better – I should have started sooner this year," she said with a laugh.

"I don't think so, but you never know. I don't know."

Serena Williams' last US Open has come to an end in the third round, going down 7-5 6-7 (4-7) 6-1 against Ajla Tomlanovic on Friday night.

It was a rough start for Williams, getting her serve broken in the first game of the match, but she got it straight back with a break-to-love by utilising her stunning power.

While her power brought her some easy points, it was also her undoing at times, with 16 unforced errors in the first set compared to 10 winners.

After securing another break to go up 5-3, serving for the opening set, Williams could not finish it off, losing the next four games in a row as Tomljanovic found a way to extend points and turn them into grinding rallies.

Not disheartened, Williams came out on fire in the second set, ripping off the first four games, but Tomljanovic again fought back. From 5-2 down, the Australian surged to level things at 5-5 before forcing a tiebreaker.

In the tiebreaker, Williams worked her way to a 5-4 lead, and took two consecutive mini-breaks to send the crowd into raptures and the match to a deciding set.

But where world number two Anett Kontaveit folded in Williams' last match, Tomljanovic did not, responding instantly after having her serve broken in the opening game to take the next five in a row, with a chance to serve things out at 5-1.

The crowd tried to will the living legend back into the contest, saving the first five of Tomljanovic's match points as she refused to go down easily, but she was not able to convert either of her three break point opportunities in a final game that lasted nearly 15 minutes, ultimately going down on the sixth match point.

After a collective groan in the sold-out Arthur Ashe Stadium, the crowd rose to their feet to pay their respect to the greatest women's tennis player of all time in her final outing at the US Open, as she treated the crowd to one more of her famous twirls at the grand slam she has won six times.

Data Slam: Six-time champion Serena leaves behind records that will stand the test of time

Williams finishes her US Open career with the seven more main draw wins than any other player, male or female. Her 108 wins leads Chris Evert (101), Jimmy Connors (98), Martina Navrilova (89) and Roger Federer (89).

She is also one of five players – along with Navrilova, Federer, Rafael Nadal and Novak Djokovic – to spend at least 300 weeks as the world number one, and her 23 career grand slam titles is the most of any player, leading Steffi Graf (22) and Nadal (22).

WINNERS/UNFORCED ERRORS

Williams – 49/51

Tomljanovic – 32/30

ACES/DOUBLE FAULTS

Williams – 11/7

Tomljanovic – 3/9 

BREAK POINTS WON

Williams – 5/13

Tomljanovic – 8/13

The Serena Williams' farewell tour in Toronto is over after she was knocked out of the Canadian Open 6-2 6-4 by 12th seed Belinda Bencic on Wednesday.

Williams, playing for the first time since declaring on Tuesday her intention to retire after this month's US Open, was no match for Tokyo Olympics gold medalist Bencic.

The 23-time major winner was unable to claim back-to-back WTA singles wins for the first time since last year's French Open, having defeated Nuria Parrizas-Diaz for her first victory in 430 days on Monday.

Bencic triumphed in one hour and 17 minutes, winning 84.2 per cent of first-serve points and converted five of eight break points throughout the match.

Williams' power was on show with 13 winners, but Bencic was physically more capable and decisively managed 25 winners with only 13 unforced errors.

Elsewhere, 2019 US Open winner and local hope Bianca Andreescu edged Alize Cornet in a see-sawing clash in the evening, winning 6-3 4-6 6-3 in two hours and 26 minutes.

Fourth seed Paula Badosa and fifth seed Ons Jabeur, who was last month's Wimbledon runner-up, were forced to retire due to injury.

Spanish 24-year-old Badosa withdrew against Yulia Putintseva 7-5 1-0 due to muscle cramping, while Zheng Qinwen had a walkover against Jabeur 6-1 2-1 due to abdominal pain.

Top seed Iga Swiatek brushed aside Ajla Tomljanovic 6-1 6-2 in 64 minutes. The win means Swiatek is the first player to win 15 WTA 1000 matches in straight sets in a row since 2009.

Canadian 13th seed Leylah Fernandez also bowed out, going down 7-6 (7-4) 6-1 to Brazil's Beatriz Haddad Maia, who will face Swiatek in the third round.

Second seed Anett Kontaveit lost 6-4 6-4 to Jil Teichmann in one hour and 27 minutes. Teichmann will next face Simona Halep who won in 71 minutes against Zhang Shuai 6-4 6-2.

Sixth seed Aryna Sabalenka got past Sara Sorribes Tormo 6-4 6-3 to set up a third-round meeting with Coco Gauff after she defeated Wimbledon champion Elena Rybakina 6-4 6-7 (8-10) 7-6 (7-3) in an epic that lasted two hours and 49 minutes.

Jessica Pegula won 6-2 7-5 over American qualifier Asia Muhammad to progress through to face Camila Giorgi after she knocked off Elise Mertens 7-3 7-5.

Third seed Maria Sakkari triumphed in three sets 6-2 4-6 6-2 over Sloane Stephens and will face Karolina Pliskova next after the Czech beat Amanda Anisimova 6-1 6-1.

Eighth seed Garbine Muguruza won 6-4 6-4 against Kaia Kanepi and Alison Riske toppled 16th seed Jelena Ostapenko 7-6 (7-2) 0-6 7-5.

Coco Gauff shined on the opening day of the Canadian Open on Tuesday, defeating American compatriot Madison Brengle 6-1 6-3 to move to a record of 14-4 from her past 18 matches.

Gauff, who has not lost to anyone ranked lower than world number 22 Amanda Anisimova since the Australian Open, continued that impressive record by cruising past world number 62 Brengle, winning 58 per cent (34-of-59) of her return points in a dominant showing.

Anisimova, who eliminated Gauff from Wimbledon, also made it through her first match unscathed as she defeated hometown Canadian Carol Zhao 6-1 6-3.

China's Qinweng Zheng put another dagger into the Canadians with her 3-6 7-6 (7-5) 6-4 win over Rebecca Marino, but Bianca Andreescu gave the fans something to cheer for as she upset world number nine and winner of this past week's Silicon Valley Classic Daria Kasatkina 7-6 (7-5) 6-4.

Spain's Sara Sorribes Tormo prevailed against American Claire Liu 7-6 (7-4) 2-6 7-6 (7-5) in a three-and-a-half-hour battle of attrition, while Australian qualifier Ajla Tomljanovic upset world number 16 Veronika Kudermetova 6-4 2-6 7-6 (7-4) in two-and-a-half hours.

It was a disappointing showing from world number 10 Emma Raducanu as she went down 7-6 (7-0) 6-2 to the reigning champion of this event, Italy's Camila Giorgi.

Naomi Osaka also will need an early flight home after being forced to retire against Estonia's Kaia Kanepi, pulling the plug due to a persistent back injury while trailing 7-6 (7-4) 3-0.

In the late session, Olympic gold medalist Belinda Bencic successfully navigated the challenge of Tereza Martincova 6-4 6-2 to book a second round fixture against Serena Williams, and world number four Maria Sakkari survived a scare to finish strong and defeat Sloane Stephens 6-2 4-6 6-2.