Emma Raducanu was forced to retire from her Korea Open semi-final against Jelena Ostapenko due to injury, leaving the Latvian to face second seed Ekaterina Alexandrova in Sunday's final.

The 2021 US Open winner was featuring in her first semi-final since that fairytale triumph at Flushing Meadows, and took the opening set 6-4 after making a flying start on Saturday.

Ostapenko then fought back to level the match, with Raducanu first appearing to struggle with her movement when she was a break up in the second, forcing her to take an off-court medical timeout.

The 19-year old later retired citing a left glute injury when 3-0 down in the decider, ending her confidence-boosting run in Seoul and teeing up a final meeting between the top two seeds.

Indeed, Alexandrova enjoyed a more routine outing in her meeting with Wimbledon semi-finalist Tatjana Maria, downing the German 6-2 6-4 to advance to her second final of the year.

At the Pan Pacific Open in Tokyo, meanwhile, Chinese teenager Zheng Qinwen reached her first WTA Tour final with a hard-fought win over world number 13 Veronika Kudermetova.

Having required over three hours to seal her 5-7 6-3 7-6 (7-3) triumph, the world number 36 said: "After the match when I won the last point, the feeling was incredible. 

"The opponent, she's playing unbelievable tennis. She has a really good serve and hits the ball hard, she moves well. It's my first time in the final. I'm so happy."

Her compatriot Zhang Shuai was unable to replicate those exploits, however, as Liudmila Samsonova eased into her third WTA final of the year with a 7-6 (7-4) 6-2 win. 

In-form Samsonova has won both of her previous final appearances this year - each of which came last month - and is 3-0 in showpiece matches for her career.

Ons Jabeur has now made it to the second week in all four grand slams after her win over Shelby Rogers at the US Open.

Jabeur, the fifth seed at Flushing Meadows, had previously fallen short of making the second week in the season's final grand slam, having reached the third round in three successive years between 2019 and 2021.

But the Tunisian world number five ended that wait with a 4-6 6-4 6-3 defeat of American Rogers.

Jabeur reached the final at Wimbledon this year, her first appearance in a major showpiece match, but lost to Elena Rybakina.

She has made it to the fourth round of the grand slams six times, having managed quarter-final runs at Wimbledon (2021) and the Australian Open (2020).

Another US Open fourth-round debutant awaits Jabeur in the form of Veronika Kudermetova, who despatched Dalma Galfi 6-2 6-0. 

Kudermetova's victory took just 46 minutes, making it the shortest match of the tournament.

Shelby Rogers continued her dream run at the Silicon Valley Classic with victory over ninth seed Veronika Kudermetova securing a spot in the final against last year's runner-up Daria Kasatkina who toppled Paula Badosa.

Unseeded 29-year-old American Rogers has knocked off top seed Maria Sakkari along with Amanda Anisimova and 2019 US Open winner Bianca Andreescu on her way to the decider.

Rogers is also yet to drop a set, maintaining that run against the higher-ranked Kudermetova for a 6-3 6-4 victory in one hour and 20 minutes.

The triumph marks Rogers' biggest final in her career and her first on tour in six years.

Rogers, who trailed 2-0 in the second set, broke Kudermetova's serve with her second match point to clinch victory.

Second seed Badosa was bundled out by Kasatkina 6-2 6-4 in 46 minutes in the other semi-final on Saturday.

Badosa did not appear 100 per cent physically throughout the match and Kasatkina capitalised to secure back-to-back finals in San Jose.

The Spaniard had three break points in the decisive game before Kasatkina converted her first match point.

Kaia Kanepi and Liudmila Samsonova both powered their way into the Citi Open final with comfortable victories on Saturday.

Sixth seed Kanepi ruthlessly swept aside Australian Daria Saville 6-3 6-1 in one hour and 13 minutes, moving her closer to her fifth career title. The 37-year-old Estonian blasted 18 winners for the match.

World number 60 Samsonova proved too good for China's Wang Xiyu, winning 6-1 6-1 in one hour and seven minutes. Samsonova's big hitting was a key feature behind her win with four aces and 17 winners.

Despite being ranked fourth in the world, Paula Badosa came into her quarter-final showdown with the red-hot Coco Gauff as the underdog, but she played like a favourite en route to a 7-6 (7-4) 6-2 victory.

Usually one of her stronger weapons, Gauff's serve was a liability on Friday, with six double faults in the first set alone to drop the opening frame despite breaking Badosa twice.

In the second set, while Badosa was converting 92 per cent (11-of-12) of her accurate first serves into points, Gauff's figure was down at 53 per cent (eight-of-15) as the Spaniard's return game was at its best.

Badosa will meet seventh seed Daria Kasatkina in the semi-final after the Russian beat Belarus' Aryna Sabalenka 4-6 7-5 6-0. The longer the match went, the less effective Sabalenka became with her ability to return serve.

In the first set, which Sabalenka won, she was successful in 53 per cent (19-of-36) of the points against Kasatkina's serve, and that number plummeted to 14 per cent (two-of-14) in the decider.

Third seed and Wimbledon finalist Ons Jabeur was eliminated by ninth seed Veronika Kudermetova 7-6 (7-5) 6-2, and she will meet unseeded American Shelby Rogers in the second semi-final after she defeated Amanda Anisimova 6-4 6-4.

Meanwhile, in Washington at the Citi Open, Emma Raducanu felt the effects of her gruelling match 24 hours prior as she went down 7-6 (8-6) 6-1 to Liudmila Samsonova.

On Thursday, Raducanu played in the longest two-set match of the WTA season as she eventually made her way through two tiebreakers against Camila Osorio in two hours and 49 minutes, and she ran out of steam after another tough tie-break against Samsonova.

Samsonova will play China's Xiyu Wang in the semi-final after another upset, knocking out fourth seed Victoria Azarenka in convincing fashion 6-1 6-3.

Estonia's Kaia Kanepi booked her place in the second semi-final after a 6-7 (4-7) 6-4 6-3 win against Anna Kalinskaya, where she will meet Daria Saville after the Australian got the better of Canada's Rebecca Marino 6-1 7-5. 

Naomi Osaka delivered a terrific third set to defeat China's Qinweng Zheng 6-4 3-6 6-1 in the opening round of the Silicon Valley Classic.

Osaka's serve was sharp and it carried her through the match, with 11 aces to Zheng's three, while giving up one break of serve and securing three breaks herself.

After Zheng fought back to win the second set, Osaka was the steady head in the decider, allowing her opponent to implode with three double-faults in crucial points to collect her first win since April.

Osaka will meet Cori Gauff in a star-studded second-round matchup after Gauff dominated Anhelina Kalinina 6-1 6-0.

She was simply too powerful for her Ukrainian opponent, winning 89 per cent (25-of-28) of her first serves to never give Kalinina a chance.

Canada's Bianca Andreescu was eliminated by American Shelby Rogers 6-4 6-2, while Russia's Veronika Kudermetova won a hard-fought battle against Italy's Camila Giorgi 7-6 (7-2) 4-6 7-5.

Meanwhile, in Washington at the Citi Open, Emma Raducanu looked in good touch as she handled the challenge of Louisa Chirico 6-4 6-2 to advance to the second round.

Raducanu will meet Colombia's Camila Osorio after she beat American Sofia Kenin 7-6 (7-2) 6-1, and top-20 talent Victoria Azarenka had no issues against Dayana Yastremska to win 6-4 6-0.

Australian Ajla Tomljanovic continued her strong run of form with a convincing 6-1 6-4 win against American Sloane Stephens, and the Czech Republic's Tereza Martincova recovered from a horrible first set to defeat Xinyu Wang 0-6 6-4 6-4.

Germany's Andrea Petkovic cruised to a 6-2 6-2 win against Denmark's Clara Tauson, and Russia's Anna Kalinskaya defeated American Madison Brengle 6-3 6-0.

Aryna Sabalenka will meet Ekaterina Alexandrova in The Rosmalen Grass Court Championship final, while Beatriz Haddad Maia set up a showdown with Alison Riske in the Nottingham Open showpiece.

Sabalenka, ranked sixth in the world, put paid to Shelby Rogers 7-6 (8-6) 6-0, as the favourite in the Netherlands reached her second singles final this year.

World number 30 Alexandrova had little difficulty against Veronika Kudermetova as she triumphed 6-3 6-1 to reach her first singles final of the season.

Sabalenka and Alexandrova have split four previous meetings with two wins apiece, with the latter taking the most recent clash in straight sets at the Moscow quarter-finals last year.

Seventh seed Haddad Maia stunned favourite Maria Sakkari in the quarter-finals to tee up the last-four clash with Tereza Martincova in Nottingham.

The Brazilian raced out the blocks once more to progress past Martincova, with the former 6-3 4-1 up before the Czech retired with injury.

Rain stopped play in the second semi-final between Viktorija Golubic and Riske with the scores level at one set each.

Sixth seed Riske capitalised from that point onwards to edge past Golubic 6-3 4-6 6-3.

Top seed Maria Sakkari was eliminated from the Nottingham Open at the quarter-final stage by world number 48 Beatriz Haddad Maia on Friday.

Haddad Maia made it three career wins out of three against Sakkari with a 6-4 4-6 6-3 victory to reach her first WTA semi-final on grass.

The Brazilian will now take on Tereza Martincova, who beat last year's runner-up Zhang Shuai 6-3 6-2, for a place in Sunday's final.

Sixth seed Alison Riske is also through to the last four after recovering from a set down to beat home favourite Harriet Dart 4-6 6-2 6-1.

Riske's sixth career semi-final on grass will come against Viktorija Golubic, who surprised Ajla Tomljanovic 6-3 7-6 (8-6) in the final match of the day.

At The Rosmalen Grass Court Championships, second seed Belinda Bencic's participation was ended with a straight-sets defeat to Veronika Kudermetova.

French Open quarter-finalist Kudermetova prevailed 6-4 6-2 in 87 minutes to snap a three-match losing streak against Bencic.

Russian compatriot Ekaterina Alexandrova is up next in the semi-finals after easing past American qualifier Caty McNally 6-0 6-1

Top seed Aryna Sabalenka is into her third semi-final in her past five tournaments, meanwhile, thanks to a 6-2 3-6 7-6 (7-5) win over Alison Van Uytvanck.

Shelby Rogers, a 3-6 6-1 6-4 winner against Kirsten Flipkens, awaits Sabalenka in Saturday's semi-final.

Elena Rybakina and Tamara Zidansek were both surprise second-round losers at The Rosmalen Grass Court Championships as numerous top seeds fell on Thursday.

Third favourite Rybakina struggled to find her rhythm and fell to a 6-2 6-4 loss against world number 42 Shelby Rogers.

The American will face Kirsten Flipkens in the quarter-finals in the Netherlands after she eased past Ann Li in straight sets.

Aryna Sabalenka, the favourite at the tournament, had little difficulty in negotiating past Arianne Hartono 6-2 6-3 and she will meet Alison van Uytvanck in the next round.

The Belgian picked up the scalp of compatriot Elise Mertens, the eighth seed, with a 6-2 6-3 win over the world number 29.

Fourth seed Zidansek was another to fall as she suffered a 6-1 6-1 loss to Catherine McNally, while Veronika Kudermetova profited from Anna Blinkova retiring with the match heading for one set each.

Belinda Bencic, the second favourite, will next challenge Kudermetova after she bucked the trend of the day with a battling 7-6 (7-2) 6-4 win over Anna Kalinskaya.

Seventh seed Ekaterina Alexandrova had no trouble in advancing, meanwhile, as she saw off Anhelina Kalinina 6-4 6-2.

Maria Sakkari found herself 1-0 down against world number 109 Rebecca Marino before rain stopped play at the Nottingham Open, but the top seed responded to claim a 1-6 6-3 6-3 win.

Third seed Camila Giorgi had no such luck against Hannah Dart as she was eliminated 5-7 6-4 7-6 (7-3), while Alison Riske and Ajla Tomljanovic beat Caroline Garcia and Katie Boulter respectively in straight sets.

Daria Kasatkina aims to climb another "mountain" when she faces Iga Swiatek in her first grand slam semi-final at the French Open.

Kasatkina won an all-Russian showdown with Veronika Kudermetova on Court Philippe-Chatrier 6-4 7-6 (7-5) to break new ground at a major on Wednesday.

The 20th seed had lost her previous two grand slam quarter-finals in 2018, but she was not denied on this occasion in Paris.

Kasatkina will do battle with Swiatek for a place in the Roland Garros final on Thursday after the world number one beat Jessica Pegula in straight sets.

Top seed Swiatek has beaten Kasatkina twice in hard-court events this year and the Pole is on an astonishing 33-match winning run.

Yet Kasatkina has not dropped a set at the French Open and the 25-year-old is relishing the challenge of playing the biggest match of her career.

She said: "We played a few times this year. Okay, I lost those matches, but it was a different story. It was a hard court, beginning of the year, I was not in the same shape as I am now.

"I cannot compare what we are going to have tomorrow and what we had in February, March when we were playing. It's going to be completely different match. I want to win a lot, she wants to win as well, and it's going to be a good match.

"You never know what's going to happen in the semi-final of a grand slam, so it's going to be fun and that's it."

Kasatkina will savour her best performance at a major, but is hungry for more.

"I have no time to relax, I'm playing already tomorrow. So a little bit of time to enjoy it, because still it's special for me, a first semi-final," she added.

"But I know that tomorrow is another mountain in front of me which I have to climb and that's it. Maybe it's even better that I don't have much time to think about how good it is to be in the semi-finals, so I have another battle."

As she prepares to face the all-conquering tournament favourite, Kasatkina does not believe she has ever been in better shape.

She said: "Mentally and physically I feel the best I ever was, which is good, because it means that I'm improving. But I don't feel safe, because when you're in the comfort zone it means there's something wrong.

"I think it's better to feel something behind you, so you don't relax much. I think I'm always ready, you have to be always be ready.

"It doesn't have to be like, 'Oh, I'm so bad, and what do I have to do now?' But if you are ready and you know how to get out of this, this is also what I learn."

Daria Kasatkina is through to her first grand slam semi-final after winning an all-Russian battle with Veronika Kudermetova in straight sets at the French Open.

Kasatkina lost her previous two major quarter-finals in 2018, but she broke new ground with a 6-4 7-6 (7-5) victory at Roland Garros on Wednesday.

The 20th seed will face Iga Swiatek or Jessica Pegula for a place in the final after ending Kudermetova's best run at a grand slam.

Kudermetova paid the price for 50 unforced errors in her maiden major quarter-final on Court Philippe-Chatrier, where Kasatkina overcame the nerves to move into the last four.

It was Kudermetova who drew first blood when she broke to lead 3-1, but she failed to consolidate as a tenacious Kasatkina responded immediately.

The two 25-year-olds both fended off a couple of break points in their next service games, but Kasatkina edged in front for the first time courtesy of a sublime cross-court winner to take a 5-4 lead after a terrible miss from Kudermetova with the court wide open.

A steely Kasatkina was moving superbly and served out the set, before moving into a 3-1 lead in the second set after three consecutive games went against the serve.

The 29th seed was struggling to find her rhythm, but she was level at 4-4 when her compatriot overcooked a forehand.

Kasatkina had looked edgy in that service game, yet she had an opportunity to serve for the match when a Kudermetova backhand struck the net cord and landed on her side of the net.

A nervy Kasatkina was unable to serve it out but held to force a tie-break after Kudermetova called for treatment on her left foot.

Kasatkina took a 6-1 lead in the breaker following a string of errors from Kudermetova and finally finished it off with her fifth match point, executing a drop shot to perfection.

Data Slam: No setbacks for Kasatkina in Paris

Kasatkina has not only put together her longest run in a grand slam, she has done so without dropping a set. While it was certainly not all plain sailing in the quarter-final, she showed her strength of character to come through another test in straight sets.

WINNERS/UNFORCED ERRORS
Kasatkina – 16/25
Kudermetova – 38/50

ACES/DOUBLE FAULTS
Kasatkina – 0/3
Kudermetova – 3/2

BREAK POINTS WON
Kasatkina – 5/17
Kudermetova – 4/7