Rebecca Sramkova handed number-one seed Petra Kvitova a shock defeat on home soil at the Prague Open to record her first WTA Tour-level win in a main draw since 2017.

The unseeded Slovakian took the first set 7-6 (7-5) before Kvitova bounced back to take the next 6-3. Sramkova, however, battled through injury to win the final set 6-4 and upset the two-time Wimbledon winner.

Seventh seed Nina Stojanovic avoided an early exit as she recovered from a first-set loss to beat Vitalia Diatchenko 6-7 (5-7) 6-1 6-3, while ninth seed Greet Minnen defeated Italian Giulia Gatto-Monticone 6-0 4-6 6-1.

Unlike Kvitova, the top seed at the Hungarian Grand Prix, Yulia Putintseva, cruised past Ekaterine Gorgodze 6-2 6-4 to record a straight-sets first-round win in Budapest.

But Irina-Camelia Begu, the fourth favourite, was not as fortunate as she failed to secure second-round progression, falling 3-6 4-6 to the unseeded Anna Karolina Schmiedlova.

The Hungarian Grand Prix provided more shocks, with Irina Bara knocking out eighth seed Sara Errani courtesy of a 4-6 7-5 6-2 triumph, while seventh seed Viktoriya Tomova crashed out to Paula Ormaechea in straight sets.

On day one of the Ladies Open Lausanne, favourite and 2021 Roland Garros semi-finalist Tamara Zidansek shook off a first-set loss to dispatch of Marina Melnikova 2-6 6-3 6-2 and book her place in the next round.

Meanwhile, second seed Fiona Ferro was leading her French compatriot Harmony Tan 7-5 2-1 before play was suspended for the day in Switzerland.

Angelique Kerber won two games on Friday to progress to the final of the inaugural Bad Homburg Open, with unseeded Katerina Siniakova her opponent.

Kerber made home advantage count, following up a 2-6 6-3 6-3 quarter-final win over Amanda Anisimova – a match that was pushed back from Thursday when rain washed out play – with a triumph over top seed Petra Kvitova.

The former world number one came back from behind to win 3-6 6-4 7-6 (7-3) and take a spot in her first WTA singles final since 2019.

Kerber and Kvitova have now met 15 times, with the German winning on nine occasions.

She will go up against an unexpected finalist in the form of Siniakova, who defeated Sara Sorribes Tormo.

The Czech is the world number two in doubles, winning three grand slam titles in that format, and will be looking to replicate the feat of her regular partner Barbora Krejcikova, who triumphed at the French Open this year.

At the Viking International in Eastbourne, Jelena Ostapenko made light work of Elena Rybakina, while Anett Kontaveit made it into the final due to Camila Giorgi's retirement.

Latvian wildcard Ostapenko finished her 6-4 6-1 victory with zero double faults – the first time she has managed such a performance since winning in Luxembourg two years ago.

"I'm really happy with the way I played this week, and every match I played better and better," Ostapenko told a news conference after clinching a spot in her ninth career final.

"It's been a while [since making a] final, so I'm really happy to be in a final and looking forward to tomorrow's match."

The 2017 French Open champion will face Estonia's Kontaveit, who has won their previous two meetings and was 5-4 up in the opening set against Giorgi when her opponent retired hurt.

"It's actually nice to have a Baltic final, because [we're] not such big countries, but we still have good players," Ostapenko added.

"Anett, I know since juniors. We have been playing a lot, maybe not so many matches but we practice sometimes together, in juniors, and played even doubles. So I know her quite well."

Novak Djokovic will start the defence of his Wimbledon title against British wildcard Jack Draper, and Serena Williams takes on Aliaksandra Sasnovich in the first round.

Djokovic is just one grand slam title away from matching Roger Federer and Rafael Nadal's record tally of 20 after winning the Australian Open and French Open this year.

The world number one will take on 19-year-old Draper, a quarter-finalist at Queen's Club last week, in his first match at SW19 for two years after the 2020 championships were called off due to the coronavirus pandemic.

Djokovic faces a potential quarter-final against Andrey Rublev, while Federer could come up against second seed Daniil Medvedev in last eight.

 

First up for eight-time Wimbledon champion Federer is an encounter with Adrian Mannarino, while injury-plagued two-time winner Andy Murray will start his home major against the 24th seed Nikoloz Basilashvili.

Stefanos Tsitsipas, beaten by Djokovic in a thrilling French Open final this month, has been drawn to face American Frances Tiafoe in round one of a tournament that gets under way on Monday.

Simona Halep announced just before the draw was made on Friday that she would not defend her title due to a calf injury.

Williams, runner-up to Halep in the 2019 final, must get past Sasnovich of Belarus in the first round and could face third seed Elina Svitolina at the quarter-final stage.

World number one and top seed Ash Barty takes on Carla Suarez Navarro, who made a grand slam return at Roland Garros after recovering from cancer. Barty could come up against Bianca Andreescu in the last eight.

Petra Kvitova against Sloane Stephens is a standout first-round match, while Coco Gauff's first assignment will be a meeting with 20-year-old Briton Fran Jones.

Second seed Elina Svitolina crashed out of the Viking International in Eastbourne at the last-16 stage on Wednesday with a straight sets defeat to Elena Rybakina.

The world number five lost 6-4 7-6 (7-3) to 21st-ranked Rybakina, whose reward is a meeting with Coco Gauff's conqueror Anastasija Sevastova in the quarter-finals.

Third seed Bianca Andreescu of Canada also lost in straight sets, Anett Kontaveit of Estonia beating her 6-3 6-3.

And it was the same story for fourth seed Iga Swiatek, though she at least took a set as she was beaten by Daria Kasatkina.

It took an impressive rally from Russia's Kasatkina to bounce back from losing the first en route to a 4-6 6-0 6-1 success.

She will now face Jelena Ostapenko, who beat Ons Jabeur 5-7 6-4 6-3.

In fact, top seed Aryna Sabalenka was the only seed to avoid a surprise exit on Wednesday as she cruised through.

The Belarussian, ranked fourth in the world, beat Alison Riske 6-1 6-4 in just over an hour to set up a clash with Camila Giorgi.

Giorgi had earlier followed up a win over defending champion Karolina Pliskova in the last round by beating Shelby Rogers 6-3 4-6 6-2.

There was no such string of shocks at Wednesday's other WTA event, the Bad Homburg Open in Germany, though first and second seeds Petra Kvitova and Victoria Azarenka needed three sets to progress.

Kvitova lost a second-set tie-break as she beat Ann Li 6-2 6-7 (4-7) 6-1 to reach the quarters, while Azarenka defeated Alize Cornet 6-4 3-6 7-6 (9-7).

Angelique Kerber, the fourth seed, progressed more smoothly, earning a comfortable 6-0 6-2 win over Russia's Anna Blinkova.

And Nadia Podoroska saw off the challenge of Patricia Maria Tig, winning 7-6 (7-4) 2-6 6-4.

Petra Kvitova came from a set down to beat Katarzyna Piter on her return from injury at the Bad Homburg Open, while no play was possible in Eastbourne on Monday due to rain.

Kvitova withdrew from the French Open after suffering a freak ankle injury during her post-match media duties at Roland Garros.

The two-time Wimbledon champion recovered to get her grass-court season under way in Germany and battled to a 4-6 6-1 6-4 over Polish outsider Piter.

A week before the third grand slam of the year gets started at the All England Club, top seed Kvitova trailed 2-0 in the final set as she struggled with her serve, but broke three times to book a second-round meeting with Ann Li.

Sloane Stephens withdrew ahead of her scheduled match with Laura Siegemund due to a foot injury. Riya Bhatia stepped in with Stephens absent, but Siegemund consigned her to a 2-6 7-6 (7-1) 6-1 defeat.

Angelique Kerber needed only 50 minutes to see the back of Ekaterina Yashina 6-1 6-1 on home soil, grasping all five break-point opportunities.

Kerber will do battle with Anna Blinkova in round two and Jessie Pegula's next assignment is an encounter with Katerina Siniakova following a 6-1 6-2 defeat of Amandine Hesse.

Blinkova beat Clara Tauson 7-6 (7-4) 4-6 6-2, while Sara Sorribes Tormo saw off Martina Trevisan 6-4 3-6 6-2

Miserable weather in Eastbourne prevented Karolina Pliskova, Madison Keys, Bianca Andreescu and Madison Keys from playing at the Viking International.

Petra Kvitova has withdrawn from the French Open after damaging her ankle in a fall during a press conference on Sunday.

Kvitova was due to face Elena Vesnina in the second round at Roland Garros, having already beaten qualifier Greet Minnen in straight sets.

The 11th seed's participation in the second grand slam of the year is over, though, due to a freak injury suffered as she was carrying out media duties after her opening match.

Kvitova - a two-time Wimbledon champion - is hoping to recover in time for the grass-court season following such an unfortunate setback.

"It is with great disappointment that I announce my withdrawal from Roland Garros," she tweeted on Tuesday.

"During my post-match press conference on Sunday I fell and hurt my ankle. Unfortunately, after an MRI and much discussion with my team, I have made the tough decision that it would be unwise to play on it.

"It's incredibly bad luck, but I will stay strong and do my best to recover for the grass court season."

Naomi Osaka fended off Patricia Maria Tig at the French Open on Sunday, but the world number two admits she has plenty of room for improvement on clay.

Osaka has been at the centre of attention in the build-up to the tournament, with the 23-year-old refusing to attend mandatory news conferences and suggesting they were not beneficial to her mental health.

The second seed stood by her decision following a straight-sets win over Romanian Tig and was subsequently handed a $15,000 fine and warned repeat offences could see her thrown out of the competition.

However, Osaka did speak in an on-court interview after her 6-4 7-6 (7-4) victory on Court Philippe-Chatrier– just her second win of the season on clay.

"I'd say it’s a work on progress," four-time grand slam winner Osaka said when asked about her clay-court game.

"Hopefully, the more I play the better it'll get. I'm really glad that I won, it's a very beautiful court. I've only played two matches here – one before the roof [was installed] and one right now. Hopefully I'll keep it going."

Next up for reigning US and Australian Open champion Osaka is Ana Bogdan, who defeated Elisabetta Cocciaretto 6-1 6-3.

ANOTHER FRENCH OPEN DUCK FOR KERBER

While Osaka took a place in round two, former world number one Angelique Kerber had no such luck as she came unstuck in the first round at Roland Garros for a third year running.

Now ranked at 27th in the world by the WTA, Kerber lost 6-2 6-4 to qualifier Anhelina Kalinina.

The French Open title has so far eluded Kerber, who has won every other grand slam, and the 33-year-old German has not won a match in Paris since 2018, when she reached the quarter-finals, having also made the last eight in 2012.

Indeed, the 33-year-old's run to the quarters in 2018 was the only time in her last six appearances at Roland Garros that she has progressed beyond the first round.

"She started well and had nothing to lose, while it took me too long to get into the contest," Kerber said. "I will try to learn from the match now because I played good the last few weeks and I had good matches."

SABALENKA AND KVITOVA BATTLE THROUGH

Aryna Sabalenka was the other top seed in action on Sunday, though she was made to work for a 6-4 6-3 defeat of Ana Konjuh.

The third seed, who is in the hunt for a first grand slam title having already won the Madrid Open this month, made a sluggish start and two breaks of serve had her 4-2 down to world number 144 Konjuh.

But Sabalenka rallied herself and a streak of four straight games handed her the set, and a further three successive breaks to start the second put her in command.

Konjuh managed to save the first match point, only for the Croatian qualifier to hit the net as Sabalenka progressed at the second time of asking.

Petra Kvitova, the 11th seed, needed three sets to overcome Greet Minnen 6-7 (3-7) 7-6 (7-5) 6-1, and had to save a match point in the process.

Two-time Wimbledon champion Kvitova was on the edge of a shock exit at 6-5 and a break down in the second set, but a backhand winner rescued her from the brink and forced another tie-break, which the Czech won before carrying the momentum into the decider.

"I would say that from my side it wasn't really good from the beginning," said Kvitova, a semi-finalist at Roland Garros last year.

"I was struggling, I was missing a lot, I was double-faulting a lot.

"I didn't really feel myself that well. I was pretty tight, it was really tough. I mean, I was fighting not only with her but with myself as well. I'm glad that in the end I beat myself as well and beat her, so that counts."

Kvitova will next face Elena Vesnina, who beat lucky loser Olga Govortsova 6-1 6-0 to seal a first singles win since she became a mother in 2018 and took a two-year break from tennis.

Petra Kvitova recovered from a poor start to beat Magda Linette in the first round of the Internazionali BNL d'Italia on Monday.

Linette took just 31 minutes to win the first set in Rome, but world number 10 Kvitova responded superbly to win 1-6 6-0 6-2.

Two-time grand slam champion Kvitova racked up 16 unforced errors in the first set, yet rallied like the great competitor she has proved to be for so long to ensure she will face Vera Zvonareva - conqueror of Christina McHale - in the second round.

The 11th seed from the Czech Republic said: "The first set I started very badly. I was missing almost everything. On the court... [the ball] was bouncing everywhere as well. A little bit windy. I just had to get used to probably everything.

"The beginning of the second set when finally I held my serve and broke her serve, I think since then it was much, much better."

French Open champion Iga Swiatek advanced when Alison Riske retired at 5-4 down in the first set due to a recurrence of a left foot injury.

Swiatek, who will take on Sloane Stephens or Madison Keys in the second round, made 18 unforced errors but had won four games in a row from 4-1 down when the American was unable to continue. 

Coco Gauff battled past Yulia Putintseva 7-5 4-6 6-4 to set up a meeting with 17th seed Maria Sakkari  - who fended off qualifier Polona Hercog 7-6 (8-6) 3-6 6-2.

Amanda Anisimova will do battle with Elina Svitolina, a winner of this tournament twice, after defeating Wang Qiang 7-5 6-3. Jessie Pegula, Jennifer Brady and Petra Martic were among the other winners on day one.

Ashleigh Barty will face the only woman on the WTA Tour to have beaten her since February after the world number one set up a Madrid Open semi-final with Paula Badosa.

Barty took her winning streak on the red clay to 15, overcoming ninth seed Petra Kvitova 6-1 3-6 6-3 to reach the last four in Madrid for the first time.

Among active players, the Australian's red-clay run is bettered only by Serena Williams (32 matches in 2013-14) and Sara Errani (16 in 2012).

The 2019 French Open champion is 24-3 for the season and has now won her last 10 matches against top-20 opponents and five of the last six with Kvitova.

Kvitova's hopes of claiming a rare win over Barty were boosted when she sent the match to a decider, but Barty took her formidable record in three-setters this year to 11-1.

"It's just always staying in the fight," Barty said of her performance in deciders this season. "Always staying in the hunt and never letting it slide away.

"That certainly doesn't guarantee results, doesn't guarantee success. It guarantees you give yourself the best chance to do what you do and to figure it out and to find your way."

Finding her way on the WTA Tour is 23-year-old Badosa, who moved up to a career-high ranking of 62 after a run to the semi-finals in Charleston last month.

She defeated Barty in straight sets en route to the last four having beaten Belinda Bencic earlier in the tournament.

Badosa got the better of Bencic again on home soil on Wednesday, prevailing 6-4 7-5, the Swiss paying the price for a string of unforced errors at the end of each set.

"I expect a completely different match," Badosa said of the reunion with Barty.

"She's the number one in the world. Now she knows me. Number one in the world, they don't like to make mistakes two times in a row, so for sure I expect a tough match and completely different to Charleston."

Aryna Sabalenka is through to the semi-finals after Elise Mertens retired from their clash with a thigh injury. Sabalenka had held a commanding 6-1 4-0 lead.

She will face Anastasia Pavlyuchenkova, who is into her first WTA 1000 semi in over a decade after recording her fourth top-25 win of the week by defeating Karolina Muchova in straight sets.

At L'Open 35 de Saint-Malo, sixth seed Arantxa Rus and seventh seed Jasmine Paolini each lost in the round of 16 but fifth seed Viktorija Golubic fought back to defeat Greet Minnen in three sets.

Ash Barty extended her winning streak to 14 matches on clay with a straight-sets defeat of Iga Swiatek at the Madrid Open.

The 2019 French Open champion defeated last year's winner at Roland Garros 7-5 6-4 to reach the quarter-finals in the Spanish capital.

Swiatek herself came into the contest having won 18 consecutive sets on clay and took early control of the contest as she went 3-0 up in the opener.

However, Barty recovered thanks to imperious play behind her serve as she won 80 per cent of all points behind her first delivery and avoided being broken for the remainder of the contest.

The world number one was 0-40 down at 3-2 in the second but rallied to hold before seeing out the win.

Barty will now face ninth seed Petra Kvitova in the last eight after she battled past Veronika Kudermetova 6-3 4-6 6-4.

The three-time Madrid Open champion required just over two hours to beat the Russian, who has won more matches in 2021 (22) than anyone except Barty (23).

"Always playing Ash, it's a great challenge," Kvitova said. "It will be a great match-up. I really will enjoy it. I'm really looking forward for it.

"She has a game for clay. She's sliding. She's playing lots of slice and everything... She likes clay a little bit more than me probably. I like Madrid. So, who knows, right?"

Eighth seed Belinda Bencic is also through after Ons Jabeur retired from their match with a thigh injury. She will now face Paula Badosa, who needed more than two and a half hours to defeat Anastasija Sevastova in three sets.

At the L'Open 35 de Saint-Malo, Alize Cornet suffered a surprise defeat in the first round as Oceane Dodin prevailed in a marathon match.

Dodin knocked out the top seed in two hours and 56 minutes, recovering after letting two match points slip in the second-set tie-break to win 7-5 6-7 (8-10) 6-1.

Third seed Alison van Uytvanck also made an early exit as Anna Karolina Schmiedlova came from a set down to prevail 2-6 7-5 6-3.

But Viktorija Golubic was victorious, the fifth seed winning in straight sets against Clara Burel.

Jil Teichmann saved six match points in a stunning defeat of Elina Svitolina before Ash Barty breezed into the second round of the Madrid Open on Thursday.

Teichmann produced an astonishing fightback to beat fourth seed Svitolina 2-6 6-4 7-6 (7-5) at the Caja Magica.

Unseeded Swiss Teichmann came from a set and a break down to claim the scalp of the world number five, who squandered a commanding 5-1 lead in the final set.

Svitolina saw six match points come and go in an incredible deciding set, opportunities she was left to rue when the 40-ranked Teichmann won a tie-break to end a contest that took two hours and 33 minutes to settle.

World number one Barty extended her winning run on clay to 12 matches with a 6-2 6-1 success over Shelby Rogers.

Barty claimed her third title of the year in Stuttgart last weekend and the Australian needed just an hour to send Rogers packing, losing just two points on her first serve and not facing a single break point.

French Open champion Iga Swiatek was also an emphatic winner, easing past another American in the form of Alison Riske 6-1 6-1.

Swiatek, making her debut in this tournament, has won 16 consecutive matches on clay after blowing Riske away.

Defending champion Kiki Bertens beat 15-year-old Victoria Jimenez Kasintseva 6-4 6-0, while Petra Kvitova progressed when opponent Marie Bouzkova retired due to hand injury after the Czech won the first set.

Garbine Muguruza was forced to withdraw ahead of her meeting with Sloane Stephens due to a leg injury. Belinda Bencic, Angelique Kerber and Johanna Konta were among the other winners in the Spanish capital.

World number one Ash Barty survived a scare to reach the semi-finals of the Stuttgart Open with a 2-6 6-1 7-5 win over Karolina Pliskova.

The Australian started slowly in the quarter-final of the WTA 500 tournament on Friday as Pliskova broke her serve twice in taking the first set, before Barty hit back with three breaks of her own to force a decider.

Barty was two points away from losing on five occasions as world number nine Pliskova served for the match at 5-4 in the final set.

But she broke the Czech's resolve eventually, sealing victory when Pliskova hit the ball long after a baseline rally.

The win was Barty's eighth consecutive victory over a top-10 opponent and she said in a media conference afterwards that facing top players in the world brings the best out of her.

"When you come up against top-10 opponents, you have to go to that level above to be able to compete. They force you to bring your best," Barty said.

"With a lot of the girls in the top 10, we've had plenty of matches that have gone either way, different experiences, so each time I love that challenge of testing myself against the best."

Barty will face Elina Svitolina in the semi-finals after she saved two match points to claim a 6-7 (4-7) 7-5 6-2 victory over Petra Kvitova.

In the other half of the draw, Simona Halep breezed through to the semi-finals with a 6-1 6-4 win over Ekaterina Alexandrova.

Halep clinically closed out the first set, and although Alexandrova showed more fight in the second, the world number three did not allow her a route back into the match.

Halep will face Aryna Sabalenka following the Belarusian's 7-5 4-6 6-1 win over Anett Kontaveit.

In the Istanbul Cup, top seed Elise Mertens secured her place in the semi-finals with a 6-4 6-4 win over Katerina Siniakova.

Mertens will face Veronika Kudermetova who fought back from a set down to clinch a 2-6 6-3 6-3 win over Ana Bogdan.

The other semi-final will see Sorana Cirstea play Marta Kostyuk. Cirstea progressed after Fiona Ferro, trailing 6-4, retired through injury while Kostyuk beat Ana Konjuh 7-5 4-6 6-3.

Ash Barty made quick work of Laura Siegemund on her Stuttgart Open debut with a 6-0 7-5 triumph in just 84 minutes.

The world number one was given a much sterner test by the former champion in the second set but won all 24 points when landing her first serve and had 19 winners to her name.

Next up for the amiable Australian is a meeting with either Jelena Ostapenko or Karolina Pliskova, who made it through to the round of 16 on Wednesday as did Angelique Kerber and Marketa Vondrousova.

Defending champion Petra Kvitova, seeded sixth, had to overcome a second-set blip to earn a 6-3 3-6 6-3 triumph over Maria Sakkari and a spot in the quarter-finals.

Anett Kontaveit continued her love affair with the tournament, upsetting third seed Sofia Kenin 7-5 6-4. She has now reached the quarter-finals or better in each of her four visits to Stuttgart – including a runner-up finish last season.

At the Istanbul Open, seeded pair Daria Kasatkina (4) and Wang Qiang (8) were ousted by Marta Kostyuk and Ana Konjuh respectively in the round of 16.

Katerina Siniakova and Sorana Cirstea both made the quarter-finals, while Kaia Kanepi was a last-32 victor over Zarina Diyas.

Petra Kvitova brushed aside Jennifer Brady as the defending champion cleared her first hurdle at the Stuttgart Open.

The Czech left-hander was the last winner of the German tournament, beating Anett Kontaveit in the 2019 final, with last year's event cancelled due to the pandemic.

Kvitova was handed a tough opening assignment against Australian Open runner-up Brady, but the American's streak of defeats since that Melbourne final defeat extended to three as Brady lost 6-4 6-3 in an hour and 32 minutes.

Two-time former Wimbledon champion Kvitova, seeded seventh, picked apart the Brady serve once in each set and fended off three break points across the contest to secure her last-16 place.

She was joined in the second round by powerful Belarusian Aryna Sabalenka, as the fifth seed scorched to a 6-2 6-2 win over China's Zhang Shuai.

Earlier, Ekaterina Alexandrova, Kontaveit, Anna Lena Friedsam and Laura Siegemund also went through to the last 16 of the WTA 500 event.

Meanwhile, Fiona Ferro caused a shock at the Istanbul Cup as she landed a 7-5 6-2 first-round win over former champion Petra Martic.

Martic, seeded second this year and ranked 21st in the world, landed the title in Istanbul in 2019 but was rolled over by French player Ferro in an hour and 45 minutes, in a match featuring seven breaks of serve.

Veronika Kudermetova followed her recent maiden title in Charleston with a nerve-jangling first-round win against Bernarda Pera, the fifth seed scrambling through 6-4 3-6 7-6 (7-4).

There was no such toil for top seed Elise Mertens, a 6-2 6-0 winner against Lara Arruabarrena, or for Daria Kasatkina, who dished out a 6-1 6-0 drubbing to Tereza Mrdeza.

Kasatkina is seeking her third title of 2021, having won previously in Melbourne and St Petersburg.

Anastasia Pavlyuchenkova bowed out of the WTA 250 event though, beaten 7-6 (7-2) 6-7 (8-10) 6-4 by compatriot Anastasia Potapova.

Top seed Ashleigh Barty moved into the quarter-finals with a three-set win over Shelby Rogers while Petra Kvitova and Garbine Muguruza exited in the Round of 16 of the Volvo Car Open in Charleston.

World number one Barty was pushed all the way by 52nd ranked Rogers, with both players trading breaks in the final set, before the Australian prevailed 7-6 (7-3) 4-6 6-4.

The victory extends Barty's winning streak to eight matches having won last week's Miami Open.

Barty won 82 per cent of first serve points and sent down 10 aces to get the edge on the American, who saved eight of 13 break points throughout the match.

"The conditions are difficult. It's pretty quick," Barty said in her on-court interview post-game.

"Shelby was able to control the centre of court for a lot of the match. It was about trying to get control when I could. She's an exceptional player, it's always a fight no matter what surface or where we are in the world. It's always one that I enjoy."

Barty will play Spaniard 71st ranked Paula Badosa in the quarter-finals after she beat Caty McNally 6-3 6-3.

Third seed Kvitova was the major casualty on Thursday, losing 6-4 6-1 to Montenegrin Danka Kovinic.

The first set was tightly fought before Kovinic pulled away as Kvitova's errors mounted.

"We both have pretty big serves and she's very good hitting from the baseline," Kovinic said post-game. "Today it was the key that I tried, and did it really well, to take her pace of the ball and use her energy."

Sixth seed Garbine Muguruza also bowed out injured, despite leading 6-0 2-2 against 11th seed Yulia Putintseva.

Muguruza laboured for a few games after a medical time-out before retiring with a left leg injury. Putintseva will next face Kovinic.

Seeds Ons Jabeur, Veronika Kudermetova and Cori Gauff also progressed to the last eight, while Sloane Stephens won in straight sets against Ajla Tomljanovic.

Meanwhile at the Copa Colsanitas second round in Bogota, seventh seed Tereza Martincova was knocked out, going down 6-3 6-3 to Colombian teenager Maria Osorio Serrano.

On the outdoor clay courts, fifth Tamara Zidansek moved into the quarter-finals with a 6-2 6-3 win over Giulia Gatto-Monticone, while Harmony Tan beat Daniela Seguel.

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