Jessica Pegula rallied after a difficult first set in an emotional US Open semi-final against Karolina Muchova to reach her maiden grand slam final.

Pegula is the oldest American woman in the Open Era to reach her first major final, where she will play Aryna Sabalenka, but she had to do it the hard way in a 1-6 6-4 6-2 in two hours and 13 minutes.

The 30-year-old won her first service game, but Muchova's strength pushed her through the rest of the first set.

Pegula then found herself 2-0 down in the second but dug deep to go on a four-match winning streak and force a decider.

After that, Muchova had no way back, as Pegula got two more breaks in the final set, and she admitted that even she was surprised by the comeback.

"I came out flat, but she was playing unbelievable, she made me look like a beginner," Pegula said.

"I was about to burst into tears because it was embarrassing, she was destroying me.

"I don't know how I turned that around, honestly."

Data Debrief: Pegula's wait is over

It is the second year in a row that an American will play in the women's singles final, with Pegula following Coco Gauff, who won the tournament last time around.

However, by defeating Muchova at the age of 30 years and 193 days, Pegula became the oldest American in the Open Era to reach a maiden grand slam final.

She is also just the third player in the Open Era to win a women's singles semi-final at the US Open after losing the first set 6-1, after Svetlana Kuznetsova (2004) and Victoria Azarenka (2020) – excluding retirements.

Karolina Muchova reached the US Open semi-finals for a second straight year by beating Beatriz Haddad Maia in straight sets at Arthur Ashe Stadium.

Muchova, who was felled in the last four by eventual champion Coco Gauff last year, missed the first two grand slams of 2024 after undergoing wrist surgery, before going out in the first round at Wimbledon.

The 2023 French Open runner-up made a blistering start to Wednesday's quarter-final, though, breaking at the first two attempts and needing just over half an hour to clinch the opener 6-1.

She then appeared to struggle with illness in the second set and was broken to love immediately after registering another break of her own, with two double faults thrown in along the way.

The world number 55 rallied magnificently, though, converting the second of two break points to immediately restore her advantage at 4-3 before receiving treatment courtside. 

Haddad Maia sought treatment herself after appearing to be in distress during the very next game, but the stop-start nature of the contest did not affect Muchova, who sealed her 6-1 6-4 victory with a huge ace.

She will face either world number one Iga Swiatek or home favourite Jessica Pegula for a place in the final on Friday, with their quarter-final clash taking place later on Wednesday.

Data Debrief: Muchova's New York upturn

A trip to Flushing Meadows has proven to be just the tonic for Muchova following a difficult start to the year.

In fact, she is the first woman to reach the semi-finals of the US Open having arrived at the tournament without a single grand slam victory all season since 2020, when Jennifer Brady achieved the feat.

She is also just the second Czech player to reach the last four while winning all five of her matches in straight sets in the Open Era, after Jana Novotna, who did so in 1994 and 1998.

Naomi Osaka's wait for a deep run into a grand slam rolls on after the former world number one was beaten by Karolina Muchova at the US Open.

Osaka, a two-time champion at Flushing Meadows, lost 6-3 7-6 (7-5) on Thursday.

She came up against a player in fine form in Muchova, with the Czech displaying the quality that saw her reach the semi-finals a year ago.

"I was just really trying to be focused," Muchova said.

"I know she's an amazing player and that I have to bring the A-game to have a chance. So I was just trying to be really focused on myself. I knew I had to serve well because her serve is really good. So I was just trying to be kind of locked in myself and focused out there."

"Then the energy and the big court and all that, it for sure helps me. I like that."

Osaka, meanwhile, suggested the nerves got to her on Arthur Ashe Stadium.

"I think during the pressure moments I got nervous," Osaka said, and I don't know if I just have to keep playing more matches and get used to that feeling, especially on a really big stage.

"Honestly, if I get past the disappointment, I feel pretty proud of myself to have gotten that many opportunities while still feeling like I could have played much better."

Data Debrief: Fifth time's the charm?

Muchova is one of nine players to have defeated five former world number ones at grand slam events.

However, out of those, she is the only active player yet to win a major or a WTA 1000 title. Will that change in New York?

Cristina Bucsa and Sara Sorribes Tormo claimed bronze in the women's doubles at the Paris Olympics, beating the Czech Republic's Karolina Muchova and Linda Noskova.  

The Spaniards dominated proceedings from start to finish, coming through in straight sets 6-2 6-2 in an hour and 13 minutes at Roland-Garros. 

Bucsa and Sorribes showed their intent from the start, breaking the Czech's serve in the opening game to claim the early advantage. 

While Muchova and Noskova improved, the Spanish pairing were able to find another break to take the encounter to 5-2, going on to claim the first set at a canter. 

The Czechs missed two opportunities to take the opening game of the second, but allowed their opponents to break their serve once again and race into a 3-0 lead. 

From then on, Bucsa and Sorribes never looked back, winning the final three games in a row to claim Spain's first medal of the day, with Carlos Alcaraz in action against Novak Djokovic in the men's singles final. 

The women's doubles gold medal match will see Italy's Jasmine Paolini and Sara Errani face Mirra Andreeva and Diana Shnaider, who are competing as Individual Neutral Athletes. 

Data Debrief: Spain off to a fine start in the days tennis

With Alcaraz guaranteed to bring home a medal for Spain, Bucsa and Sorribes ensured there was double delight for the nation in the French capital. 

In a one-sided affair, the Spaniards converted five of the nine break points they had, while also winning seven of their service games compared to the Czechs' two. 

Coco Gauff suffered back-to-back defeats in her respective doubles matches as her hopes of an Olympic gold medal were dashed at Roland-Garros. 

In her first game of the day, Gauff teamed up with world number six Jessica Pegula to face Czech Republic duo Karolina Muchova and Linda Noskova. 

After taking the first set, Gauff and Pegula were unable to continue their momentum, falling to a 6-2 4-6 5-10 defeat. 

The American pairing started strongly and raced into an early lead, taking the opening set in what seemingly looked like a straightforward victory for Team USA. 

However, Muchova and Noskova rallied and in a second set that saw five break points converted by both, the Czech's would prevail to take the game to a decider. 

Gauff and Pegula lost four straight games to put their opponents in the ascendency, with Muchova and Noskova able to see out the win to progress to the quarter-finals. 

Gauff emerged back onto the clay courts in the French capital for her mixed-doubles match soon after, joining Taylor Fritz to face a Canadian pairing of Felix Auger-Aliassime and Gabriela Dabrowski. 

The American duo would come from a set down to take the game to a decider, but it would be their opponents who emerge 6-7 (2-7) 6-3 8-10 victors. 

Gauff and Fritz exchanged blows with the Canadians, but were edged out in a first set tie-break after losing four games on the spin. 

But not wanting to let their dreams of a medal die, the American pair would recover from losing an early break point to rally and earn one of their own in the eighth game, seeing out the win to take Gauff to her second third-set decider of the day. 

However, the same result would transpire, with Auger-Aliassime and Dabrowski edging a nail-biting conclusion to book their place in the quarter-finals of the competition. 

Aryna Sabalenka completed a ruthless defence of her Australian Open title by beating first-timer Zheng Qinwen in the final.

The world number two lifted her first grand-slam trophy at Melbourne Park 12 months ago and has been untouchable this fortnight.

She did not drop a set in seven matches and defeated Zheng 6-3 6-2 to become the first player since countrywoman Victoria Azarenka 11 years ago to claim back-to-back titles.

Zheng, who had not had to face a top-50 player through the first six rounds, had hoped to emulate the watching Li Na and claim the title for China a decade on.

But the 21-year-old, the 12th first-time slam finalist in the women’s game in the last three years, was up against it from the start and Sabalenka wrapped up victory in only 76 minutes despite a brief disruption from pro-Palestine protesters.

Zheng was the first player this century to reach a slam final without facing a seeded opponent, and the low rankings of her opponents made this a huge step up.

Early nerves were evident and Sabalenka set straight about seizing on the Zheng serve, breaking for 2-0 and then holding from 0-40 in another statement of intent.

Zheng has struggled with the consistency of her serve this tournament but, when she has made the first delivery, it has been very effective, and two aces helped her get on the board in the fourth game.

The Chinese fans in the crowd were making their presence felt but, while Zheng came up with more big serving to save three set points at 5-2, Sabalenka finished it off decisively on her own delivery.

The Belarusian has ridden emotional highs and lows throughout her career, and her stellar 2023 could have brought her more than one slam title had she not wobbled in defeats by Karolina Muchova, Ons Jabeur and Coco Gauff.

The latter came in the US Open final after Sabalenka had dominated the first set, but here she has been steely on and off court, claiming a cathartic win over Gauff in the semi-finals.

Zheng had won just five games in their only previous meeting in the quarter-finals in New York last summer, and her hopes of doing better were hit by a disastrous start to the second set, serving three double faults in the opening game.

With Zheng trying to hold in the third game, the match was briefly delayed when two spectators held up a Palestinian flag in the stands and shouted until they were hauled away by security to cheers from the remaining fans.

Zheng kept her composure to get on the board but her serve had really dropped off and Sabalenka broke again to lead 4-1.

Zheng managed some brief late resistance, saving four match points, but Sabalenka crunched a forehand winner on her fifth chance before thrusting her arms into the air.

The US Open semi-final between Coco Gauff and Karolina Muchova was held up after a protest in the stands.

Three people, wearing T-shirts bearing the words ‘fossil fuels’ began shouting after the first game of the second set, forcing play to be stopped.

American teenager Gauff and Czech 10th seed Muchova initially stayed on the court for about 10 minutes while security tried to deal with the situation.

The Arthur Ashe crowd at one point began chanting “kick them out” with the protesters apparently being difficult to shift.

“Are they like talking to them or are they going to remove them?” Gauff asked chair umpire Alison Hughes and tournament referee Jake Garner.

She then spoke to her coach, Brad Gilbert, saying “they say they are negotiating, like it’s a hostage situation. What should I do?”

Both players eventually left the court with Gauff leading 6-4 1-0.

Karolina Muchova produced one of the shocks of the French Open by upsetting Aryna Sabalenka to reach her first grand slam final.

Muchova came from 5-2 down in the final set, saving a match point, to win 7-6 (5) 6-7 (5) 7-5 and will take on defending champion Iga Swiatek, who survived her first test, beating Beatriz Haddad Maia 6-2 7-6 (7).

Miyu Kato found Paris redemption in the mixed doubles, winning the title with German Tim Puetz after her disqualification from the women’s doubles.

Picture of the dayStat of the dayTweet of the dayQuote of the dayWho’s up next?

The men’s finalists will be decided at Roland Garros on Friday.

The blockbuster match comes first up when world number one Carlos Alcaraz meets Novak Djokovic for only the second time in a generational clash for supremacy in the men’s game.

The second encounter, meanwhile, sees Casper Ruud trying to make a second final in two years against Alexander Zverev, whose semi-final here last year against Rafael Nadal ended with him leaving the court in a wheelchair.

Top seed Iga Swiatek had little trouble navigating the challenge of Sorana Cirstea in Thursday's Indian Wells Open quarter-final, cruising to a 6-2 6-3 victory.

The world number one started brilliantly by breaking the unseeded Romanian's serve on her first opportunity, and despite Cirstea responding, Swiatek rattled off the final four games of the opening set.

The 21-year-old Polish phenom would not stop there as she continued on a streak of eight consecutive games to jump ahead 4-0 in the second set, finishing the job in 83 minutes.

It is Swiatek's third consecutive tournament where she has made it to at least the semi-finals, having won the Qatar Open and reached the final of the Dubai Tennis Championships in February.

The last time she did not reach the semi-final in a tournament was in January's Australian Open, when she was sent packing in the fourth round by Elena Rybakina.

She will get a chance to avenge that defeat in the semi-final after Rybakina set up the rematch by getting the better of Karolina Muchova 7-6 (7-4) 2-6 6-4.

Rybakina, who became the first Kazakhstan-born player to reach the semi-final of a WTA1000 event since 2009, had a much more competitive affair. 

In the razor-thin battle, both Rybakina and Muchova won exactly 106 out of 212 points, but the reigning Wimbledon champion and Australian Open finalist produced 14 break point opportunities to the Czech's six.

It will be the fourth overall meeting between Swiatek and Rybakina, and after the Pole took their first clash, Rybakina responded with back-to-back straight-sets victories.

The winner will earn a spot in the final, where they will meet the victor of Maria Sakkari and Aryna Sabalenka.

Top seed Iga Swiatek will be hard top stop in her title defence at the Indian Wells Open after a straight-sets thrashing over Emma Raducanu in Tuesday's last 16.

The Polish world number one eased to victory 6-3 6-1 in one hour and 25 minutes over the 2021 US Open champion, who has enjoyed an improved run this week in California.

Swiatek offered few weaknesses in a strong disciplined display, converting four of 10 break points, including three in a one-way second set.

The three-time major winner won 88 per cent on her first serve while she was impressive on return and able to win the longer rallies. Swiatek hit 22-9 winners while Raducanu made 22-14 unforced errors.

Swiatek will take on Romania's Sorana Cirstea in the quarter-finals, after she upset fifth seed Caroline Garcia 6-4 4-6 7-5 in two hours and 24 minutes.

Reigning Wimbledon champion Elena Rybakina also progressed in that part of the draw, setting up a last-eight clash with unseeded Czech Karolina Muchova.

Rybakina won 6-3 6-0 over qualifier Varvara Gracheva in a similarly strong performance, needing only one hour and 21 minutes.  Muchova beat compatriot Marketa Vondrousova 6-4 6-7 (2-7) 6-4 in two hours and 37 minutes.

Third seed Jessica Pegula was the major casualty of the day's play, going down 6-2 3-6 7-6 (13-11) to 16th seed Petra Kvitova in a dramatic two-hour-and-16-minutes clash.

Pegula had opened up a 5-3 third-set lead and squandered a match point on serve, before two-time Wimbledon winner Kvitova squared it up at 5-5. Kvitova, however, was broken immediately to offer Pegula another chance to serve out the match again, which she was unable to take.

The American generated another three match points in the tie-break but could not convert before the Czech eventually prevailed on her own fourth match point, with the deciding set lasting one hour and 12 minutes.

Kvitova will face seventh seed Maria Sakkari in the quarters after she triumphed in a lengthy clash 6-4 5-7 6-3 over Karolina Pliskova, lasting two hours and 43 minutes.

Second seed Aryna Sabalenka also needed three sets to beat Barbora Krejcikova 6-3 2-6 6-4 in two hours and four minutes. Krejcikova had been responsible for Sabalenka's lone loss this season, in a 15-1 year.

Sabalenka, who won this year's Australian Open, will face sixth seed Coco Gauff who defeated Rebecca Peterson 6-3 1-6 6-4. Gauff won the last four games for victory, having trailed 4-2 in the deciding set.

World number one Iga Swiatek proved too good for 32nd seed Bianca Andreescu as she emerged victorious 6-3 7-6 (7-1) in Monday's third round at the Indian Wells Open.

Swiatek started shakily as her serve was broken in the first game of the match, and although she got it back instantly, both competitors ended up creating eight break point opportunities each in a closer-than-expected match.

She will meet England's Emma Raducanu in the fourth round after the resurgent 20-year-old collected her best win of the year, defeating 13th seed Beatriz Haddad Maia 6-1 2-6 6-4.

Raducanu, the 2021 US Open champion, has begun to work her way back up the rankings. Having come into the tournament ranked 77th in the world after an injury-riddled season, she has now won four of her past five matches, with her only loss in that span coming against world number six Coco Gauff at the Australian Open.

World number five Caroline Garcia was pushed to a third set for the second match in a row, but prevailed 6-4 6-7 (7-5) 6-1 against Leylah Fernandez, booking a clash against Romania's Sorana Cirstea after she won 6-3 6-1 against fellow unseeded competitor Bernarda Pera.

Karolina Muchova kick-started a great day for the Czech Republic representatives as she got the better of Italy's Martina Trevisan 6-4 3-6 6-4, and Marketa Vondrousova kept it going with a 7-6 (7-5) 6-4 victory over world number four Ons Jabeur.

Reigning Wimbledon champion Elena Rybakina is shaping up as a threat to win it all, yet to drop a set this week following her 6-3 7-5 triumph over Paula Badosa.

Iga Swiatek started the defence of her Qatar Open title by taking less than an hour to beat Danielle Collins on Wednesday.

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.

Victoria Azarenka breezed into the second round of the Qatar Open with an emphatic straight-sets defeat of Ipek Oz on Monday.

Playing her first match since losing to Elena Rybakina in the semi-finals of the Australian Open, Azarenka dispatched outsider Oz 6-1 6-1.

Azarenka, a two-time champion in Doha, only needed an hour and seven minutes to book a meeting with Belinda Bencic or Viktoriya Tomova.

The Belarusian broke twice in the first set and four times in the second, failing to hold just the once in a commanding display.

Eighth seed Veronika Kudermetova battled her way past Barbora Krejcikova, winning 6-4 3-6 7-6 (7-5).

Karolina Muchov secured an impressive 6-2 6-2 win over Martina Trevisan in the opening first-round match of the day.

Aryna Sabalenka secured a straight-sets win in her first match of 2023, but was made to work for it by Liudmila Samsonova at the Adelaide International.

The number two seed won 7-6 (10-8) 7-6 (7-3), saving seven set points after going 5-1 down in the first set, before roaring back to take both tie-breaks.

Sabalenka will face Marketa Vondrousova in the quarter-finals, with the Czech having produced a dominant performance in a 6-0 6-4 win against Kaia Kanepi. 

"When it's 1-5 down, it's like you have nothing to lose, and you just go for your shots without thinking," Sabalenka said.

"That really helped me to stay in the set, to keep fighting and to keep trying."

Fourth seed Veronika Kudermetova eased through after a 6-4 6-0 victory against Bianca Andreescu, while Marta Kostyuk also advanced with a hard-fought 6-7 (5-7) 6-2 6-3 win over Elena Rybakina.

At the ASB Classic in Auckland, second seed Sloane Stephens is out after falling to Rebeka Masarova.

Having been forced to resume on Wednesday after rain suspended play the previous day, Stephens struggled against her Spanish opponent, eventually losing 6-3 7-6 (7-5).

Fifth seed Wang Xiyu is also out after retiring from her match against Karolina Muchova, but seventh seed Danka Kovinic is through after a simple 6-1 6-4 win against Nao Hibino.

Kovinic will face Lauren Davis next after she overcame Tamara Zidansek 6-2 6-1, while fellow American Sofia Kenin will take on number one seed Coco Gauff in the last 16 after she beat Wang Xinyu in straight sets.

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.