It was a day for comebacks at the Stuttgart Open, with number one seed Iga Swiatek recovering from a set down to beat Karolina Pliskova in the quarter-finals.

Swiatek made a disastrous start, going 4-0 down, and though she broke back once, was unable to find the second as Pliskova took the opening frame 6-4.

The determined Pole stepped up a level though to take the second 6-1, before breaking early in the third.

It was still an improvement for the Czech player, who lost 6-0 6-0 to Swiatek in their only previous meeting in Rome in 2021.

Pliskova kept her opponent honest on her own serve, but Swiatek had too much for the world number 17 as she clinched the decider 6-2.

Aryna Sabalenka also showcased her powers of recovery as she beat Paula Badosa despite going a set down.

The second seed won 4-6 6-4 6-4 in an even contest that saw nine breaks of serve, before the Belarusian eventually got over the line.

Sabalenka is now the player with the joint-most comeback wins over the last two seasons (13) level with Caroline Garcia, though the French star was actually the victim of a comeback herself on Friday.

Garcia won the first set against Anastasia Potapova, before the Russian came back to take it 4-6 6-3 6-3 to set up a semi against Sabalenka.

There was no need for such drama from Ons Jabeur, who eased to a 6-3 6-0 victory against Beatriz Haddad Maia in just 68 minutes to confirm a clash with Swiatek.

Iga Swiatek is through to the quarter-finals of the Stuttgart Open after easing to a 6-1 6-4 win over Zheng Qinwen on her return from a rib injury.

Swiatek had not played since sustaining the issue in the semi-finals of Indian Wells over a month ago, but advanced on Thursday despite stating that she felt "rusty".

The world number one won 84 per cent of points after landing her first serve in as she made up for lost time.

Swiatek also forced eight break points, winning four of them as she took just and hour and 26 minutes to set up a quarter-final with Karolina Pliskova, who bested Donna Vekic in a thriller.

Pliskova looked to be on her way to a routine win as she claimed the first set 6-2, only for the Croatian to take the second via a tie-break.

The decider also went the distance, with Pliskova able to finally put Vekic away 6-2 6-7 (5-7) 7-6 (7-5) to book her clash with Swiatek.

Coco Gauff perhaps paid the price for taking almost three hours to beat Veronika Kudermetova on Wednesday, as the fifth seed fell to a straight-sets loss to Anastasia Potapova on Thursday, going down 6-2 6-3.

Fourth seed Caroline Garcia will go up against Potapova next after she defeated Tatjana Maria 7-6 (7-5) 6-4, while Paula Badosa had few problems seeing off fellow Spaniard Cristina Bucsa 6-1 6-2 and will face second seed Aryna Sabalenka in the last eight.

Third seed Jessica Pegula rallied back from a set down for the second straight match to advance into the final 16 with a 3-6 6-4 7-5 victory over 26th seed Anastasia Potapova.

Potapova won the first set in 39 minutes, claiming the only break of the frame in the sixth game, but Pegula responded by breaking immediately in the second.

Despite squaring the match up, the American trailed 3-1 in the third set, only to fight back again and triumph in two hours and 17 minutes.

Pegula will face 15th seed Petra Kvitova after she won a seesawing three-set contest over 24th seed Jelena Ostapenko, 0-6 6-0 6-4.

Ostapenko won the first six games, before Kvitova won the next 10, only for the Latvian to hit back and claim the next four, squaring up the deciding set at 4-4. But two-time Wimbledon champion Kvitova held her nerve and won the final two games for victory.

World number two Aryna Sabalenka progressed to the final 16 via walkover after her third-round opponent Lesia Tsurenko withdrew.

The 2023 Australian Open champion will take on 2021 French Open winner Barbora Krejcikova after she toppled Wang Xin 6-2 6-7 (1-7) 6-2.

Seventh seed Maria Sakkari secured victory in a two-and-a-half-hour third-round clash with Anhelina Kalinina, winning 3-6 6-2 6-4.

Two-time major runner-up Karolina Pliskova won 6-1 7-5 over Veronika Kudermetova, progressing into the last eight to face Sakkari.

Sixth seed Coco Gauff, who turns 19 on Monday, eased past 54th-ranked fellow teenager Linda Noskova 6-4 6-3 in one hour and 19 minutes.

Sweden's Rebecca Peterson continued her resurgent form with a 3-6 6-3 6-1 win over Jil Teichman, setting up a clash with Gauff.

Aryna Sabalenka showed exactly why she is ranked second in the world as she dominated her opening match of the Indian Wells Open on Friday against Evgeniya Rodina.

Belarus' Sabalenka needed just 66 minutes to defeat the Russian 6-2 6-0, taking advantage of her first-round bye to book her spot in the third round against Ukraine's Lesia Tsurenko.

Tsurenko had to come from behind against the in-form Donna Vekic, fresh off her Monterrey Open title last week, but that big effort may have had the Croatian with heavy legs as she ran out of steam 2-6 6-2 6-2.

It was a strong day for the Ukranians as 27th seed Anhelina Kalinina beat the Czech Republic's Linda Fruhvirtova 4-6 6-4 7-5, and she will next face Greece's Maria Sakkari.

Sakkari, the seventh seed, had to deal with adversity after a poor first set against Shelby Rogers, coming back to win 2-6 6-4 6-0.

Olympic gold medallist Belinda Bencic lost her Swiss showdown against Jil Teichmann 3-6 6-3 6-3, while Veronika Kudermetova got the better of her Russian compatriot Anna Blinkova 6-3 6-4.

The second-highest ranked American in the field, Coco Gauff, had no issues dispatching Spain's Cristina Bucsa 6-2 6-4. But it was tougher work for America's top hope Jessica Pegula as she was pushed all the way by recent Merida Open champion Camila Giorgi, before prevailing 3-6 6-1 6-2.

Iga Swiatek continued her ruthless form as she progressed with ease to the WTA Dubai Tennis Championships third round on Tuesday.

The world number one cruised to a 6-1 6-1 triumph over 2021 US Open finalist Leylah Fernandez, just three days after winning the Qatar Ladies Open in Doha.

That marked Swiatek's 41st main-draw victory in WTA 1000 events in just her 53rd outing, only Serena Williams and Maria Sharapova (52 each) have won more than 40 such matches in fewer attempts.

The 21-year-old has won her last 35 hard-court matches against opponents ranked outside the world's top 30, though Swiatek said she had to adapt against Canada's Fernandez.

"It wasn't that easy for sure. It was much tougher than the score said," said Swiatek, who will look to make the fourth round for the first time in Dubai when she faces Liudmila Samsonova.

"In the second set ... I needed to go a level up. I didn't have much time to get used to the conditions, but I'm just happy I could play solid tennis."

Jessica Pegula, the third favourite at the tournament, defeated Viktoriya Tomova 6-2 5-7 6-1 to set up a third-round battle with Ana Bogdan, who overcame Shelby Rogers 7-6 (7-3) 6-3.

Fifth seed Coco Gauff coasted past Aliaksandra Sasnovich with a 6-0 6-4 victory, teeing up a meeting with Elena Rybakina, who slammed six aces in a 7-5 6-2 defeat of Marie Bouzkova.

World number two Aryna Sabalenka, who defeated Rybakina at this year's Australian Open final, made light work of lucky loser Lauren Davis in a straight-sets rout as she claimed her 12th straight win in 2023.

Dubai's defending champion Jelena Ostapenko will be the next challenge for Sabalenka after defeating 17-year-old Linda Fruhvirtova for her seventh straight win at the event.

Barbora Krejcikova saved four match points en route to a 6-4 4-6 7-5 win over seventh seed Daria Kasatkina and will meet Karolina Pliskova next after she downed sixth favourite Maria Sakkari in straight sets.

Belinda Bencic and Marta Kostyuk played out the match of the day as the former claimed a 6-7 (7-9) 7-6 (7-5) 6-4 triumph, with that clash taking three hours and 27 minutes – the second-longest on the WTA Tour this year.

Poland will have a woman in the semi-final of the Australian Open after Magda Linette emerged victorious 6-3 7-5 in Wednesday's quarter-final against Karolina Pliskova.

World number one Iga Swiatek was expected to be flying the flag for Poland deep into the tournament, but after her surprising exit it is now the 30-year-old Linette who will try to step up and go all the way.

Having never advanced past the third round at any of her previous 29 grand slam appearances, Linette has now hit a remarkable run of form that includes consecutive wins over world number 19 Anett Kontaveit, world number 18 Ekaterina Alexandrova, and world number four Caroline Garcia.

Against Pliskova – a former world number one – Linette capitalised on some sloppy play as her Czech opponent committed an uncharacteristic 36 unforced errors with only 18 winners.

Pliskova also committed seven double-faults, leading to a meagre 58 per cent success rate (34-of-59) from her service points, while Linette converted at a 70 per cent clip (45-of-64).

Speaking on the court immediately after her triumph, Linette said: "I will never forget this. This is the first time ever I'm breaking through some really difficult things for me. This will stay with me for life, so I'm really grateful and super happy for the support."

Linette will face the winner between Aryna Sabalenka and Donna Vekic in the semi-final, while Elena Rybakina and Victoria Azarenka will battle it out for the other spot in the decider.

Emma Raducanu and Coco Gauff both got off to winning starts at the ASB Classic in Auckland on Tuesday.

Raducanu had to come from a set down to beat Linda Fruhvirtova 4-6 6-4 6-2, while top seed Gauff had an easier time of it as she dismissed Tatjana Maria 6-4 6-1 on another day interrupted by the rain.

Second seed Sloane Stephens was only able to get through three games before play was suspended in her match against Rebeka Masarova, while fifth seed Wang Xiyu was 5-3 down in the first set against Karolina Muchova when the rain came.

Fourth seed Bernarda Pera is out after her match with Viktoria Kuzmova resumed having being washed out on Monday, and the American was unable to prevent a 6-4 6-4 defeat, with Kuzmova advancing to face Raducanu in the last 16.

The only two other matches completed on Tuesday saw Elena-Gabriela Ruse beat Erin Routliffe in three sets, and Anna Blinkova overcome Elisabetta Cocciaretto, also in three.

At the Adelaide International, Zheng Qinwen earned a hard-fought victory against number six seed Anett Kontaveit, eventually winning 6-1 4-6 7-6 (9-7).

Eighth seed Ekaterina Alexandrova also crashed out despite winning the first set against Marketa Vondrousova, going on to lose 4-6 6-3 6-2, though seventh seed Jelena Ostapenko is through after beating Karolina Pliskova 6-1 6-3.

In a contest that lasted over two-and-a-half hours despite only two sets being played, Victoria Azarenka beat Anhelina Kalinina 7-6 (11-9) 7-6 (7-5), and will face Zheng next, while Sorana Cirstea will go up against top seed Ons Jabeur in the last 16 after beating Viktorija Golubic in straight sets.

Karolina Pliskova will reunite with coach Sascha Bajin for the 2023 season, she has announced.

The pair previously began working together in November 2020, with Pliskova going on to enjoy a successful 2021 season that saw her reach the Wimbledon final, as well as the title matches in Rome and Montreal.

However, they parted in July 2022 after the former world number one, who missed the start of the campaign with a hand injury, suffered a surprise second-round Wimbledon exit, having also fallen at that stage of the French Open.

Despite reaching the US Open quarter-finals under the guidance of Czech compatriot Leos Friedl, Pliskova has slipped to 31st in the WTA rankings, but German coach Bajin is confident her fortunes can improve.

"I am returning mainly because I still believe I can help Karolina with my insights," Bajin said.

"Her game has gradually improved since her hand injury and, in my eyes, she has proven that she can still compete with the best in the world.

"We will want to build on these performances and that is why we have decided to renew our connection. I can't wait to sit in her corner again."

Of Friedl, Pliskova added: "Many thanks to Leos, who willingly started working with us immediately. I think that under his guidance, we managed to get some interesting results."

Coco Gauff won the battle of the American teenagers as she progressed into the San Diego Open second round with a 6-3 6-3 over Robin Montgomery on Wednesday.

The 2022 French Open finalist beat fellow 18-year-old Montgomery in a rain-affected match in one hour and 23 minutes, to clinch a last-16 clash with Bianca Andreescu.

The match marked Gauff's first game on tour since losing to Caroline Garcia in the US Open quarter-finals last month, although she had to endure an overnight rain delay, resuming on Wednesday up 6-3 3-2.

Gauff only needed 20 minutes on Wednesday to close out the victory, finishing the match with 3-0 aces, winning 76 per cent on her first serve and converting four of seven break points.

Croatian qualifier Donna Vekic continued her strong run with a 6-3 6-2 win over 2022 US Open quarter-finalist Karolina Pliskova. Vekic moved into the third round, having beaten Maria Sakkari in the first round too.

Fourth seed Jessica Pegula eased her way into the third round with a 6-3 6-1 victory over wild card Coco Vandeweghe in only 69 minutes. Pegula can secure her first WTA Finals qualification this week.

Danielle Collins was another American victor, triumphing 6-2 6-4 over Italy's Martina Trevisan in one hour and 27 minutes, reaching her third quarter-final of the year.

Donna Vekic produced a spectacular second set to shock world number seven Maria Sakkari 7-6 (7-3) 6-1 in the first round of the San Diego Open on Tuesday.

After a hard-fought first set where both women were able to convert one of their four break point opportunities, Vekic took control in the tie-breaker and carried that momentum in the second set.

Vekic won 65 per cent of her service points in the second set, while Sakkari could only muster a 47-per-cent success rate, despite having a significant edge in first-serve accuracy (79 per cent to Vekic's 53 per cent).

The Croatian only had two break point opportunities, and that is all she needed, taking both to run away with one of the biggest wins of her career.

Vekic will play Karolina Pliskova in the second round after the Czech defeated America's Caroline Dolehide 6-3 6-4.

Pliskova, ranked 22nd in the world, had no issue with the world number 181 in one of Tuesday's biggest mismatches, nabbing a break-to-love in the first set before taking a quick double-break to begin the second.

World number 11 Daria Kasatkina was too strong for Leylah Fernandez, cruising to a 6-2 6-2 victory in exactly one hour.

Sloane Stephens earned a shot against world number five Aryna Sabalenka in the second round after getting the better of Switzerland's Jil Teichmann 6-1 7-6 (7-2).

World number 13 Garbine Muguruza was clearly not at 100 per cent, retiring hurt after losing the first five games of her match against China's Qinweng Zheng, and Coco Gauff will resume her contest against Robin Montgomery leading 6-3 3-2 after rain halted the action for the day.

Naomi Osaka's title defence at her home Pan Pacific Open event came to a premature end as she withdrew from her second-round match against Beatriz Haddad Maia.

The former world number one, who won the Tokyo tournament when it was last held in 2019, was unable to compete in Thursday's match due to illness.

"I am really sorry that I am not able to compete today," Osaka said. "It's an honour to be able to play at the Pan Pacific Open in front of the amazing fans here in Japan.

"This has and always will be a special tournament for me and I wish I could have stepped on court today, but my body won't let me."

Haddad Maia advanced on a walkover and will next face fourth seed Veronika Kudermetova, who defeated Mexican qualifier Fernanda Contreras Gomez 6-0 6-1 to reach the quarter-finals.

Liudmila Samsonova also progressed to the last eight, with a 7-6 (7-5) 6-3 win over Wang Xinyu continuing her good form.

However, sixth seed Karolina Pliskova exited the competition on Thursday at the hands of Petra Martic, who prevailed 6-3 6-4 and will face Zhang Shuai next.

At the Korea Open, top seed Jelena Ostapenko recovered from two games down in the deciding set to overcome Anastasia Gasanova 6-3 5-7 7-5.

Ostapenko remains on a possible semi-final collision course with Emma Raducanu, who came through 6-4 7-5 against Yanina Wickmayer, while Magda Linette saved two match points to beat Kristina Mladenovic 4-6 7-6 (7-5) 6-2.

Naomi Osaka began the defence of her Pan Pacific Open crown with a quick win after opponent Daria Saville was forced to retire in just the second game.

Four-time grand slam champion Osaka won the opening game, before Saville was unable to continue due to a scary-looking injury to her left knee.

The former world number one will now face a second round match with world number 16 Beatriz Haddad Maia, who eased to a straight sets victory over Yuki Naito.

Karolina Pliskova secured her place in the next round in Tokyo with a 6-2 6-1 demolition of Isabella Shinikova, while Zhang Shuai will face second seed Caroline Garcia on Wednesday after overcoming Mai Hontama in two sets.

In Seoul, Jelena Ostapenko's hopes of repeating her 2017 heroics at the Korea Open are still alive after the number one seed narrowly beat 19-year-old Jeong Bo-young.

The world number 19 looked to be cruising after the opening set, but the unheralded South Korean hit back in the second and took it to a tie-break in the third, before Ostapenko's class showed as she won the crucial tie-break 7-2.

Elsewhere, 2021's beaten finalist Kristina Mladenovic saw off wildcard Park So-hyun 6-4 4-6 6-3, while second seed Ekaterina Alexandrova overcame a worrying second set to beat Asia Muhammad 6-1 3-6 6-1.

Wimbledon semi-finalist Tatjana Maria is also safely through to the second round after a tight 7-6 (7-5) 7-6 (7-5) triumph over Eugenie Bouchard.

Aryna Sabalenka credited a greater awareness of what to expect from Karolina Pliskova for her US Open quarter-final victory.

Sabalenka and Pliskova went into Wednesday's match having split their four previous meetings.

Pliskova, though, had the last two, the Czech coming from a set down to beat Sabalenka in last year's Wimbledon semi-finals and also prevailing in the last four in Montreal in 2021.

But Sabalenka turned the tide this time around at Flushing Meadows, a blistering forehand return sealing a 6-1 7-6 (7-4) triumph and a place in a second successive US Open semi-final.

Sabalenka said in her on-court interview: "The last two matches, I don't want to say I didn't respect her and I didn't expect from her a great level, I was thinking ok I'm on the top I have to beat her and today I expect a great level, I expect the long rallies, I expect the tough match and I just tried to stay in this match as long as I can and just tried to make her work for it and should played really well and somehow I was able to handle this level and win this match."

Next up for Sabalenka will be either world number one Iga Swiatek or home hope Jessica Pegula.

And she knows either opponent will present a significant hurdle as Sabalenka seeks to reach a first grand slam final.

"It's a semi-final, it's going to be tough and I'm ready for it, I'm ready for another fight," she added. 

"I think I just have to stay focused on myself and do whatever I can, do my best and be ready for a great battle."

Aryna Sabalenka believes she is ready for the challenge of Karolina Pliskova in the quarter-finals after losing both of their meetings in 2021, saying she knows what to expect this time around.

Sabalenka defeated Danielle Collins 3-6 6-3 6-2 on Monday, with the world number six coming from a set behind to collect her seventh win from her past eight matches.

With Pliskova getting the better of Sabalenka's Belarusian compatriot Victoria Azarenka 7-5 6-7 (5-7) 6-2, it sets up the fifth career meeting between the pair, with their head-to-head record split at two wins apiece.

Sabalenka won both meetings in 2018, but after years without a match against each other, Pliskova flipped the script in 2021 with wins in Montreal and at Wimbledon.

Speaking to the media after her fourth round win, Sabalenka said she was caught by surprise at how much Pliskova had improved in the years between their matches, and how that will not be the case this time around.

"To be honest, on those matches, the first matches I won against her, I was an upcoming player," she said. "I was lower in the ranking, I was respecting every top player. I was kind of expecting a great level from them.

"Then, in the last two matches last year, I was in the top. Every time she was making me move, every time she was making winners, I was like, what's going on? How is it possible? Oh, my God, she is making winners.

"I want to say that I wasn't kind of really respecting her. Right now I really expect great level from her. 

"It's going to be tough. Every time she will make some winners, it's not going to be pissing me off, it's going to be like, okay, it's normal, she's making it, what next?"

Meanwhile, Pliskova believes she is playing her best tennis of the season at the moment after advancing to the quarter-finals for the second straight year, having lost to Maria Sakkari at Flushing Meadows in 2021.

She told the media after defeating Azarenka that it may have been her best performance of the year – and maybe even longer.

"I think this was one of the best matches this year, from my side," she said. "I think also from her. I thought the level of the tennis was quite good for all three sets.

"Maybe in the third set, maybe she started to drop it a little bit. Of course, it was understandable because physically it was also quite tough. We had long rallies, long points, long games.

"But quite happy with my level. I think I'm playing quite good tennis now, maybe even better than last year here."

Simona Halep came from a set behind to defeat seventh seed Jessica Pegula 2-6 6-3 6-4 in the semi-final of the Canadian Open on Saturday, booking her place in the final against Beatriz Haddad Maia.

Romania's Halep, the 15th seed, struggled to return Pegula's serve in the opening set, winning just 32 per cent (nine-of-28) of her return points while compounding her early issues with four double faults.

Whether Pegula began to run out of steam, or Halep figured something out, she had significantly more success against the American's serve the rest of the way, winning 55 per cent (12-of-22) of her return points in the second set, and 57 per cent (20-of-35) in the decider.

Halep has now won 11 of her past 13 matches, and Pegula is her third consecutive win against a top-25 opponent after defeating both world number 21 Jil Teichmann and world number 13 Coco Gauff in straight sets. 

While this will be Halep's 18th career WTA 1000 final, it will be Haddad Maia's first, after she emerged triumphant 6-4 7-6 (9-7) against 14th seed Karolina Pliskova.

She did not have a serving advantage against Pliskova, who won the ace count nine-to-one, but she was gritty, saving four of the six break points she faced, and refused to concede the second set after dropping the first three games.

Haddad Maia – the only Brazilian ranked inside the top-100 – has now beaten five consecutive top-25 opponents on her way to the final, including world number one Iga Swiatek, Olympic gold medalist Belinda Bencic and Canadian hometown hero Leylah Fernandez.