Daria Kasatkina

Kasatkina, who beat Shelby Rogers in the final of the Silicon Valley Classic a couple of weeks ago, dominated Parry from the jump with her powerful serve.

Parry did not stand a chance when Kasatkina would land her first serves fair, with the Russian converting 88 per cent (15-of-17) of those opportunities in the opening frame, before winning 92 per cent (12-of-13) of her total service points in the second set.

Kasatkina, who has now collected three straight-sets wins in a row, will face Australia's Daria Saville in the final after her semi-final opponent, Marta Kostyuk, withdrew due to injury.

Meanwhile, at Tennis in the Land, Liudmila Samsonova continued her red-hot form with a 6-1 6-2 semi-final victory over Bernarda Pera to book her place in the final.

Samsonova, who is yet to drop a set at the tournament, dominated both with her serve and in her return game, winning 89 per cent (32-of-36) of her service points and 56 per cent (24-of-43) of her return points. She created nine break point opportunities, while allowing zero.

She will play Aliaksandra Sasnovich in the final after the Belarusian outlasted France's Alize Cornet 6-7 (5-7) 7-5 6-3 in a match that lasted two hours and 53 minutes.

Sasnovich shot herself in the foot early with four double faults in the opening set, but cleaned it up as the match wore on, committing just two the rest of the way.

In an emotional interview with documentary maker Vitya Kravchenko, Kasatkina, who lives in Barcelona, teared up at the prospect of potentially being unable to return to Russia after being so candid.

The recent French Open semi-finalist has won four WTA titles in her career, including trophy runs at the Kremlin Cup in Moscow and the St Petersburg Open.

She has spoken about matters of sexuality in the past, and when asked whether she has a girlfriend, Kasatkina said in the new documentary: "Yes."

On her social media accounts, Kasatkina confirmed she and Olympic figure skater Natalia Zabiiako, who she described as "my cutie pie", are a couple.

She knows LGBT matters are taboo in Russia, saying: "So many subjects are taboo in Russia, some of them more important than ours, it's no surprise.

"This notion of someone wanting to be gay or becoming one, so ridiculous I think. There's nothing easier in this world than being straight.

"Seriously, if there is a choice, nobody would choose being gay. Why make your life harder, especially in Russia? What's the point?"

Asked whether she would be able to hold hands with her girlfriend in Russia, Kasatkina said: "Never."

Assessing the process of coming out, the 25-year-old said: "It's up to you how to do it and how much to tell. Living in peace with yourself is the only thing that matters, and f*** everyone else."

Few Russian sports stars have spoken out against the invasion of Ukraine, but Kasatkina made it clear that she feels strongly the war must stop.

Asked what she wanted most of all, Kasatkina said: "For the war to end. There hasn't been a single day since February 24 that I haven't read some news myself. Or haven't thought of it. [I want] for the day to just pass by without it.

"What people go through there, people that have relatives in Ukraine, especially when you start talking about Russia, Belgorod, here we go again. I can't imagine what they're going through, it's a full-blown nightmare.

"If only we could do something to stop that, even tiny percentage to stop. Not to change people's minds or something, only stop. Without a thought, I'd do anything, but unfortunately that's impossible and I think you understand it. We can't affect it. We can't change events that unfold. You feel powerless."

When she was asked by Kravchenko whether she was afraid she might not be allowed back to Russia because of her criticism, Kasatkina said: "Yes, I have thought about it."

She broke down in tears at that point.

Kasatkina has found support for coming out, with former doubles star Pam Shriver among those thanking her. She was also praised by Russian women's national team footballer Nadya Karpova, who has spoken about her own lesbian life and has also been a critic of the war.

Karpova posted on Instagram: "You are beautiful! I'm proud."

Kasatkina thanked Karpova in the YouTube documentary, saying: "Not only did Nadya help herself by coming clean and getting this burden off her chest, but she helped others.

"I believe it's important the influential people from sports, or any other sphere really, speaks about it. It helps."

World number 10 Kasatkina took a 6-4 6-4 victory in one hour and 53 minutes of hard battle with her great friend, Saville showing resilience despite struggling with an ankle problem.

The outcome made Kasatkina the second Russian winner of the day on the WTA Tour after Liudmila Samsonova took the Tennis In The Land title in Cleveland, Ohio.

Kasatkina, who also won the Silicon Valley Classic in early August, will turn her focus away from a successful week in Canada and towards the US Open, which gets under way in New York on Monday.

The 25-year-old will be targeting a deep run at Flushing Meadows after achieving her best grand slam result in June when she reached the French Open semi-finals, before being prevented from playing Wimbledon due to a blanket ban on players from Russia and Belarus imposed by the All England Club.

In the second set of a gruelling and gripping tussle, Saville looked nailed on to come from 4-1 down to level at 4-4 when she led 40-0 in the eighth game, only for her game to briefly disintegrate, allowing Kasatkina to move 5-3 ahead.

Still, it was an unsteady Kasatkina at the other end of the court, and the Barcelona-based player was broken by Saville when serving for the match.

There was nothing secure about Saville on serve either, and Kasatkina had two match points in the next game at 15-40. She was unable to take either, or the third and fourth that arrived soon after. On her fifth opportunity, Kasatkina was relieved to see Saville hit wide.

Kasatkina begins her US Open campaign against British qualifier Harriet Dart on Monday, while Saville starts on the same day against Romanian Elena-Gabriela Ruse.

Third seed Kontaveit, who won this competition last year, retired when a set down to Tereza Martincova, while world number seven Maria Sakkari was defeated 5-7 7-5 7-5 by 21-year-old American Alycia Parks in a big upset.

Parks lost the opener but found two crucial breaks of serve when 6-5 up in both the second and third sets to eliminate the fourth seed.

The withdrawal of Belinda Bencica – seeded sixth – with a foot injury put Barbora Krejcikova into the quarter-finals, while Ekaterina Alexandrova will also be in the last eight after overcoming fifth seed Daria Kasatkina 6-1 7-6 (7-1).

The tournament favourites were in much better form at the Jasmin Open in Tunisia, as the top two seeds sealed their places in the quarter-finals with straight-sets wins.

Favourite Ons Jabeur cruised to a 6-1 6-3 victory over Evgeniya Rodina, converting four of her seven break points to safely advance to the next round of her home tournament.

And number two seed Veronika Kudermetova eased past Magdalena Frech 6-3 6-4 to set up a quarter-final meeting with Diane Parry.

Sixth seed Kudermetova showed great defiance to defeat American Collins 4-6 7-6 (7-5) 6-1 on Thursday.

Kudermetova fended off five match points when serving to stay in the tournament at 6-5 down in the second set and duly forced a tie-break.

Collins, runner-up to Ash Barty in the Australian Open final last year, took a 3-0 lead in the breaker, but back came her Russian opponent to level the match.

The world number nine dominated the deciding set to seal a meeting with Bencic in the last four.

Eighth seed Bencic got the better of WTA Finals champion Garcia 6-2 3-6 6-4.

Garcia broke straight back after going 3-1 down in the final set, but Bencic broke for the fourth time in the match to go through.

Paula Badosa and Daria Kasatkina will contest the other semi-final after beating Beatriz Haddad Maia and Petra Kvitova respectively. 

Elisabetta Cocciaretto saved two match points as she came from a set down to beat Bernarda Pera 5-7 7-6 (10-8) 6-4 in the quarter-finals of the Hobart International. 

The 21-year-old Italian will now face 2020 Australian Open champion Sofia Kenin, who also stormed back to defeat Anhelina Kalinina 4-6 6-3 6-1.

Lauren Davis and Anna Blinkova will do battle in the other semi-final following wins over Wang Xinyu and Yulia Putintseva respectively. 

World number 26 Camila Giorgi battled from a break down in both sets to beat fifth seed Muguruza 7-5 6-3 in an hour and 53 minutes. 

That meant 12th seed Giorgi made her second straight quarter-final, following a last-eight appearance in Birmingham, and will next face Viktoriya Tomova, who defeated Kirsten Flipkens 3-6 6-3 6-4. 

Jil Teichmann, the 10th seed at the tournament, was a notable second-round elimination, falling to a 7-6 (9-7) 4-6 6-3 defeat to Briton Harriet Dart, who later triumphed 6-4 2-6 6-4 over Marta Kostyuk. 

Dart's fellow Briton Katie Boulter stunned last year's Wimbledon runner-up Karolina Pliskova in the second round but had no such luck against Petra Kvitova, losing 5-7 6-0 7-5. 

Beatriz Haddad Maia, the winner at the Birmingham Open last week, extended to a 12-match winning streak with a 6-1 6-2 victory over Jodie Burrage. 

Jelena Ostapenko also progressed after Madison Keys retired when 6-3 down and will next face Anhelina Kalinina, who battled to a 6-3 2-6 6-3 win over 16th seed Yulia Putintseva. 

While seeds fell at Eastbourne, there were not as many shocks at the Bad Homburg Open, where Angelique Kerber defeated Lucia Bronzetti 6-2 6-3 to reach the quarter-finals. 

Fourth seed Simona Halep also made the last eight with 6-0 6-3 victory over Tamara Zidansek and will meet Amanda Anisimova after she won an All-American match against Ann Li 6-0 6-2. 

Alize Cornet downed Tatjana Maria 7-6 (7-4) 6-4 to tee up a clash with Kerber, while Bianca Andreescu will meet top seed Daria Kasatkina after defeating Katie Swan 6-4 6-4. 

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.

The 18-year-old Czech was impressive against the third seed as she recorded her first win against anyone in the top 30 of the world rankings.

Fourth seed Veronika Kudermetova eased past Amanda Anisimova in just an hour and 15 minutes, winning 6-3 6-0, while Liudmila Samsonova will face second seed Aryna Sabalenka in the next round after coming from a set down to beat Zhang Shuai 5-7 6-3 6-0.

Irina-Camelia Begu and Elena Rybakina also both came from behind to secure wins, with the latter beating fifth seed Danielle Collins to set up a last-16 clash against Ukrainian Marta Kostyuk, who beat Jaimee Fourlis 6-1 3-6 6-4.

At the ASB Classic in Auckland, 42-year-old Venus Williams comfortably overcame her 21-year-old opponent Katie Volynets 7-6 (7-4) 6-2, and will play China's Zhu Lin next after she eliminated sixth seed Madison Brengle 4-6 7-6 (8-6) 6-4.

Third seed Leylah Fernandez beat Brenda Fruhvirtova 6-1 6-1 to set up a last-16 tie with Julia Grabher after she defeated Tereza Martincova in three sets.

Eighth seed Rebecca Marino is through after beating Dalma Galfi in straight sets and will now face Ysaline Bonaventure, who eventually put away Caty McNally 5-7 6-4 6-4.

Viktoria Kuzmova led fourth seed Bernarda Pera 5-4 in the opening set when rain stopped play for the day.

Four-time grand slam winner Osaka crashed to a resounding 6-3 6-1 loss to Spain's Sara Sorribes Tormo, exiting her first tournament on clay since the 2021 French Open, where she withdrew citing mental health issues.

Osaka, who had posted an underwhelming 20-15 record on the surface prior to this week, looked uncomfortable throughout and appeared to struggle with a leg injury during a disappointing second set display.

The 24-year-old was not the only high profile player to be on the receiving end of a shock during a day of drama in the Spanish capital, as several of the competition's seeds failed to secure places in the last 16.

Another home favourite, Garbine Muguruza, fell to a resounding loss of her own as Anhelina Kalinina raced to a 6-3 6-0 victory over the seventh seed, while sixth seed Danielle Collins was thrashed 6-1 6-1 by Canadian Bianca Andreescu.

Fourth seed Maria Sakkari was the highest-ranked player in action, and although the world number five won the first set of her clash with Daria Kasatkina, the Greek eventually fell to a 3-6 6-3 6-1 loss, while 2021 US Open runner-up Leylah Fernandez went down 6-4 6-4 to Jil Teichmann.

One big name who did make comfortable progress, however, was Fernandez's US Open conqueror Raducanu, who eased to a 6-2 6-1 win over Kostyuk to set up a last-16 encounter with another Ukrainian in Kalinina. 

The 19-year-old, who has been quoted as saying she believes clay could prove to be her best surface in the future, was delighted with her victory and enjoying the tournament after dropping just one game in the second set.

"I'm definitely happy with my performance," Raducanu said on court. "Marta's a great opponent - I knew it was going to be a really tough battle. I went out there trying to be really aggressive and it paid off.

"It's my first clay court season and I'm really enjoying it. Madrid is such a cool city and it's got such a great vibe about it. I definitely want to try and stay here for as long as possible."

It is the first time since the 2012 Stuttgart Open that all four top seeds reached the final four in a WTA 500 event.

Pegula, the top overall seed and the only remaining American, used her commanding serving game to overwhelm 12th seed Paula Badosa 6-3 7-6 (8-6).

She ended up winning 80 per cent of her accurate first serves – compared to 57 per cent for Badosa – and it resulted in the Spaniard producing just one break point opportunity in the match, which she could not take.

Pegula will meet fourth seed and Olympic gold medallist Belinda Bencic next after her relatively comfortable 6-3 6-3 triumph against Russia's Ekaterina Alexandrova.

Switzerland's Bencic needed just 80 minutes to get the job done, creating 12 break point chances compared to Alexandrova's two, while winning the first three games of each set.

After coming into the tournament without consecutive wins since early January, reigning Wimbledon and US Open finalist Ons Jabeur looked back to her best in a dominant 6-0 4-1 (retired) drubbing of Anna Kalinskaya.

Jabeur is yet to lose a set in Charleston, and she will try to keep that the case when she faces Daria Kasatkina in her semi-final.

Kasatkina earned her spot in the final four with Friday's only three-setter, emerging victorious 6-7 (5-7) 6-4 6-2 against Madison Keys in just over two and a half hours.

Pegula, the top-ranked American and the tournament's overall top seed, may have thought it was going to be smooth sailing after collecting a break-to-love in the match's opening game, but it was just the beginning of a two-hour-and-32-minute battle.

Begu played terrific tennis against a world-class opponent, winning 47 per cent of the match's total points, but she shot herself in the foot with eight double faults while Pegula had just one.

With the victory, Pegula booked her place in the quarter-final against Spain's Paula Badosa after her stylish 6-1 6-3 result over Russian 19-year-old Diana Shnaider.

Badosa now has a 4-2 record since the beginning of March, but both of those losses came to the in-form Elena Rybakina in eliminations from both the Indian Wells Open and the Miami Open.

Meanwhile, reigning Wimbledon and US Open finalist Ons Jabeur needed just 82 minutes to dispatch Caroline Dolehide 6-3 7-5, and combined with her opening victory against Lesia Tsurenko it is Jabeur's first consecutive wins since the Adelaide International in early January.

Jabeur will play Anna Kalinskaya in her quarter-final after the Russian upset two-time Australian Open champion Victoria Azarenka 6-4 7-6 (7-5).

It was a strong day for the Russians, as Ekaterina Alexandrova got the better of Julia Grabher 6-4 6-2, and world number eight Daria Kasatkina knocked out Bernarda Pera 6-3 7-6 (7-3).

Olympic gold medalist Belinda Bencic won the longest match of the day in a two-hour-and-45-minute war of attrition against Shelby Rogers 4-6 7-5 6-2, but the Americans had something to cheer for in the late window as Madison Keys advanced past Magda Linette 6-2 3-6 6-1.

The former US Open champion was outclassed by her opponent, with the Russian cruising to a 6-2, 6-2 triumph to progress to the semi-finals of the competition. 

Having started brightly, Raducanu would drop an early break point in the fourth game, allowing Kasatkina to race into a commanding lead before seeing out the first set. 

The Brit would again start slow as Kasatkina found another early break, and despite Raducanu's best efforts, was unable to mount a comeback. 

Kasatkina would end the match with a strong serve, with Radacanu sending the ball long to confirm the win for the Russian, who will play Jasmine Paolini in the next round.

Data Debrief: Raducanu second-best at Eastbourne

Radacanu was outclassed by the world number 14 throughout but can take confidence from her two impressive wins over Jessica Pegula and Sloane Stephens. 

For Kasatkina, she reached her second consecutive semi-final at Eastbourne, impressing on centre court as she won 68% of her first serve points against Raducanu. 

The former US Open champion was outclassed by her opponent, with the Russian cruising to a 6-2, 6-2 triumph to progress to the semi-finals of the competition. 

Having started brightly, Raducanu would drop an early break point in the fourth game, allowing Kasatkina to race into a commanding lead before seeing out the first set. 

The Brit would again start slow as Kasatkina found another early break, and despite Raducanu's best efforts, was unable to mount a comeback. 

Kasatkina would end the match with a strong serve, with Radacanu sending the ball long to confirm the win for the Russian, who will play Jasmine Paolini in the next round.

Data Debrief: Raducanu second-best at Eastbourne

Radacanu was outclassed by the world number 14 throughout but can take confidence from her two impressive wins over Jessica Pegula and Sloane Stephens. 

For Kasatkina, she reached her second consecutive semi-final at Eastbourne, impressing on centre court as she won 68% of her first serve points against Raducanu. 

The former US Open champion was outclassed by her opponent, with the Russian cruising to a 6-2, 6-2 triumph to progress to the semi-finals of the competition. 

Having started brightly, Raducanu would drop an early break point in the fourth game, allowing Kasatkina to race into a commanding lead before seeing out the first set. 

The Brit would again start slow as Kasatkina found another early break, and despite Raducanu's best efforts, was unable to mount a comeback. 

Kasatkina would end the match with a strong serve, with Radacanu sending the ball long to confirm the win for the Russian, who will play Jasmine Paolini in the next round.

Data Debrief: Raducanu second-best at Eastbourne

Radacanu was outclassed by the world number 14 throughout but can take confidence from her two impressive wins over Jessica Pegula and Sloane Stephens. 

For Kasatkina, she reached her second consecutive semi-final at Eastbourne, impressing on centre court as she won 68% of her first serve points against Raducanu. 

Ninth-seed Raducanu was the biggest name in action on Tuesday and had been hoping to rack up three successive WTA Tour victories for the first time since her incredible US Open success in September last year.

But Kalinina, who saw off Sloane Stephens and Garbine Muguruza in her two previous matches, got the better of the Brit in an entertaining 6-2 2-6 6-4 win.

Raducanu had not dropped a set in either of her first two outings in Madrid but Kalinina quickly put an end to that.

While the teenager responded well in the second, getting an important break to make it 3-1, Kalinina rallied again in what was a closer deciding set.

The pair traded breaks and then Kalinina got another to set her en route to victory at 5-4 – she had to save one more break point but did ultimately see off Raducanu to book a clash with Jil Teichmann in the last eight.

Teichmann beat Elena Rybakina earlier in the day, dispatching the 16th seed in impressively comfortable fashion as she won 6-3 6-1.

Progression from the last eight for Teichmann will see her reach the semi-final of a WTA 1000 event for the first time.

Sara Sorribes Tormo, the last Spaniard left in the draw, defeated Daria Kasatkina 6-4 1-6 6-3 in something of a rollercoaster ride to line up a quarter-final contest with 12th seed Jessica Pegula.

The American kept her focus despite opponent Bianca Andreescu needing a medical timeout and rain causing a 30-minute halt, eventually winning 7-5 6-1.

The world number 11 is among a number of Russian and Belarusian players set to return to the All England Club next week following last year’s ban due to the invasion of Ukraine.

Kasatkina, who first faces Saturday’s Eastbourne final against Madison Keys, left Roland Garros in early June with a “very bitter feeling” having being jeered by the crowd after her defeat to Ukrainian Elina Svitolina.

She is enjoying being back in front of “very respectful” spectators in Britain for the first time in two years and looking forward to competing at SW19.

“I have always liked playing in the UK,” she said following her 6-2 7-5 semi-final win over Camila Giorgi at the Rothesay International. “I had good results here and good memories.

“I’m really happy to be back and to have this opportunity again.

“It feels great because the people here, we can see that they have got the culture of the game, they know when they have to support, when it’s the tight moment of the match.

“They are very respectful to the players. People are super nice to me. I really appreciate the support.”

Knowing Svitolina would stick to her policy of not shaking hands with Russian or Belarusian players, Kasatkina gave her opponent a thumbs-up in Paris but still received boos.

The 26-year-old Russian has been drawn to play American Caroline Dolehide in the first round at Wimbledon.

Asked if she thinks the welcoming atmosphere will continue in south-west London, she replied: “Oh, even more. The tournament is the most classic tournament we have.

“The only disturbing fact on the matches is the popping of the champagne! I’m really happy to be back there.”

Kasatkina, who has spoken against the war in Ukraine, dug in to see off Giorgi on Friday at Devonshire Park.

She breezed through the opening set in just over half-an-hour but was forced to hold off a fightback in a tight second after her Italian opponent battled back from 4-1 down to level at 5-5.

World number 25 Keys awaits her in Saturday’s showpiece after she overcame an injury scare to progress to her second Eastbourne final by upsetting fellow American Coco Gauff.

The 2014 champion, who suffered a painful fall in the middle of the second set, triumphed 6-3 6-3 against the world number seven on a blustery afternoon in Sussex.

“I just took a slip and my hip went in the direction it shouldn’t have gone in,” said the 28-year-old, who has been draw against British wildcard Sonay Kartal at Wimbledon. “Hopefully it’s fine for tomorrow.

“I’ve had a little bit of a not great year so far, so being able to make a final here where I won my first title is amazing.

“It’s definitely 10 times more difficult when you have to play Coco and then you throw in hurricane winds on top of it.”

Playing for the first time since she was knocked out of the Australian Open by Elena Rybakina in the fourth round last month, normal service was resumed by the domineering world number one in Doha.

The top seed brushed Collins aside in only 53 minutes, racing to a 6-0 6-1 victory to march into the third round.

Collins only won four points as she suffered the misery of a first-set bagel, an inspired Swiatek taking the opener in only 21 minutes.

Swiatek's run of games won was ended at nine when Collins got on the board at 3-1, but the Pole broke for a fifth time before serving it out for an emphatic victory.

The 21-year-old three-time grand slam champion, who made only six unforced errors, will do battle with Belinda Bencic for a place in the quarter-finals.

Bencic beat two-time champion Victoria Azarenka 1-6 7-6 (7-4) 6-4 to take her place in the last 16, storming back from 4-1 down in the second set when she appeared to be on her way out.

Second seed Jessica Pegula saved two match puts as she dug deep to beat Jelena Ostapenko 6-2 2-6 7-5 to set up a meeting with Beatriz Haddad Maia, who beat Daria Kasatkina in straight sets.

Fourth seed Coco Gauff got the better of Petra Kvitova 6-3 7-6 (8-6), while Veronika Kudermetova and Maria Sakkari also made it through.

The Australian Open finalist, who was runner-up to Aryna Sabalenka in Melbourne less than a fortnight ago, wrapped up a 6-4 6-2 win after just 69 minutes.

Looking to build on her momentum after reaching a second major final, the third seed broke the former world number one in the opening game of the first set and twice in the second.

Next up for the Kazakh is a showdown with sixth seed Beatriz Haddad Maia, who edged out Yulia Putintseva 6-4 6-7 (5-7) 7-6 (7-4).

Top seed Daria Kasatkina was forced to come from behind before eventually sealing her third victory over Jil Teichmann in as many meetings.

Last season's French Open semi-finalist has endured a mixed start to 2023. A finalist in Adelaide, she suffered a surprise first-round exit at the Australian Open.

It looked like Kasatkina's struggles would continue after losing the opening set 6-1, but she lost just two games thereafter to prevail a commanding 1-6 6-0 6-2 victor.

Elsewhere, Liudmila Samsonova reached her first quarter-final of the year after beating former French Open champion Barbora Krejcikova 7-5 7-6 (8-6).

Over in Linz, Melbourne quarter-finalist Donna Vekic enjoyed a commanding 6-3 6-1 victory over Madison Brengle to book a last-eight clash with top seed Maria Sakkari.

There were also wins for sixth seed Petra Martic and Clara Tauson over Alison Van Uytvanck and Camila Giorgi respectively, but fourth seed Anhelina Kalinina was beaten in straight sets by Anna-Lena Friedsam.

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.

Sakkari is one of the players needing a strong result in the tournament to break into the top-eight of the world rankings to qualify for the upcoming WTA Finals, entering the week at 10th, but only needing to make up one spot, with number eight Simona Halep out due to injury.

With her victory over Kostyuk, Sakkari avoided notching four consecutive losses for the first time this season, and will likely only need one more win to move into WTA Finals contention.

Her next opponent appears to be world number 16 Danielle Collins, who had no issue dispatching American compatriot Caroline Dolehide 6-4 6-1 to book her second-round fixture against Magdalena Frech after the Polish qualifier beat Yulia Putintseva 6-3 6-4.

World number seven Daria Kasatkina also should be locked into the WTA Finals after cruising past China's Lin Zhu 6-1 6-2, while 18th-ranked Beatriz Haddad Maia's season is over after a disappointing 7-5 6-2 upset loss to Katerina Siniakova.

Petra Kvitova needed to reach the final to have a chance of qualifying, but after a strong first set she fell 3-6 6-2 6-0 against Canada's Bianca Andreescu. In a good day for the Canadians, Eugenie Bouchard also beat Kayla Day 7-5 6-3 as the former world number five fights her way back up the rankings after a long injury layoff.

Italy's Elisabetta Cocciaretto defeated Russia's Anastasia Potapova 6-2 6-1, while Latvia's top talent Jelena Ostapenko cruised past America's Lauren Davis 6-1 6-3.

Madison Keys was too strong for Magda Linette in a 6-3 6-3 triumph, and in an all-Czech matchup, Marie Bouzkova downed Tereza Martincova 6-2 7-5.

Croatia's Donna Vekic eliminated Brazil's Laura Pigossi 6-4 6-1, and Italy's Martina Trevisan showed why she is top-30 in the world with a convincing 6-4 6-3 straight sets win against Japan's Nao Hibino.

In the last match of the night, world number 10 Caroline Garcia survived an early scared to come from behind and defeat Rebecca Marino 6-7 (2-7) 6-3 7-6 (7-5).