Jessica Pegula advanced to her first-ever major semi-final, stunning Iga Swiatek in straight sets at the US Open on Wednesday.
The home favourite became the fourth American to reach the semi-finals of this year's tournament after Emma Navarro, Taylor Fritz and Frances Tiafoe.
Pegula took advantage of the world number one's off-night, cruising through 6-2 6-4 in just under 90 minutes on Arthur Ashe Stadium.
There was little let-up for Swiatek, who lost her serve twice in quick succession at the start of the match as Pegula raced into a commanding lead, and the sixth seed recovered well after going behind in the second set to pull back in front.
And Pegula, who made just one double fault, and 22 unforced errors compared to Swiatek's 41, believes that was the difference in the quarter-final.
"I thought I played a really clean match, served pretty well, returned well," Pegula said.
"I feel like I didn't really do anything that bad and was able to kind of jump on her really early, and I think frustrate her.
"I was able to keep my level even when she picked it up in the second set."
Pegula will face Karolina Muchova for a place in the final.
Data Debrief: Righting wrongs
Going into Wednesday's match, history was not exactly on Pegula's side as she held a 0-6 record in her previous grand slam quarter-finals.
However, a quick start ensured that she claimed her 21st WTA top 10 win of her career - in the past four decades, only two US players have claimed more without reaching a women's singles final at a grand slam, though she will be hoping to avoid staying on that list.
Pegula is also the fourth American in the Open Era to reach the women's singles semi-finals at the Canadian, Cincinnati and US Open in a calendar year after Rosemary Casals (1970), Serena Williams (2013-15) and Sloane Stephens (2017).
Wawrinka reflects on 'tough year' after reaching ATP 1000 hard-court milestone
Stan Wawrinka reflected on a "really tough year" after racking up a new ATP 1000 milestone with his first-round victory over Giovanni Mpetshi Perricard at the Shanghai Masters.
The three-time grand slam champion secured a 7-6 (7-2) 7-6 (8-6) victory in China in what was the first ATP meeting between the two.
According to Opta Ace, it represented Wawrinka's landmark 100th hard-court victory in ATP 1000 events, becoming the 12th player to do so.
Speaking on court after the victory, the veteran 39-year-old said: "It's been a really tough year so far, but I'm not getting younger so I'm trying to keep pushing myself.
"I'm happy with the match. I think it was a really good level. I was playing really good, one of the best matches of the year for me.
"He's such an aggressive player. It was great to be here, so much support here, so I'm enjoying my time in China."
Wawrinka, who only had five ATP wins this year before featuring in Shanghai, next faces Flavio Cobolli in round two.
Gauff rallies back against Starodubtseva to reach China Open semi-final
Coco Gauff came from behind to defeat Yuliia Starodubtseva and reach the semi-finals of the China Open.
Gauff was no match for the qualifier in the first set of Thursday's tie, but the American rallied back to win 2-6 6-2 6-2.
The world number six will face Paula Badosa, the 15th seed, on Saturday.
She is vying for a place in her first final since she triumphed in Auckland in January, and her first at a WTA 1000 event since she won the Cincinnati Open in 2023.
Data Debrief: Comeback queen
Including retirements, Gauff (two) has achieved multiple match wins from a set down at a single WTA 1000 event for the first time in her career, and for the first time at a single WTA event overall since last year's US Open.
Since the format's inception in 2009, meanwhile, only Caroline Wozniacki (eight) has reached more WTA 1000 semi-finals than Coco Gauff (seven) before turning 21. World number one Iga Swiatek (five) is the only other player to reach 5+ semi-finals over that span.
Badosa stands between Gauff and the final. She beat home hope Zhang Shuai in the quarters, and became the second Spaniard to reach the semi-finals of the China Open since the inception of the tournament in 2004 after Garbine Muguruza in 2015.
She is the second oldest player to reach the semi-finals of the China Open in their maiden appearance after Amelie Mauresmo in 2006.
Alcaraz lauds 'beast' Sinner after winning China Open classic
Carlos Alcaraz described Jannik Sinner as "a beast" and the world's best player after downing the Italian in Wednesday's remarkable China Open final.
Alcaraz and Sinner battled it out for over three hours in the Beijing showpiece match, with Alcaraz eventually triumphing 6-7 (6-8) 6-4 7-6 (7-3).
The Spaniard took the decisive tie-break with a remarkable run of seven straight points, having lost a tie-break in the opening set to fall behind.
At the age of 21 years and 150 days, Alcaraz is the youngest player to defeat the world number one in an ATP event final after losing the opening set since Juan Martin del Potro (20 years, 356 days), who came back to beat Roger Federer at the US Open in 2009.
Speaking after his sixth career win over the Italian (four defeats), Alcaraz outlined his belief he had overcome the very best in the sport.
"He could have won in two, I could have won in two, he could have won in three. It was a really close match," said Alcaraz.
"Jannik, once again, he showed that he's the best player in the world, at least for me.
"The level that he's playing, it's unbelievable. It's a really high quality of tennis. His shots, physically, mentally... he's a beast."
Sinner breezed into a 3-0 lead in the third-set tie-break, only for Alcaraz to show extraordinary resilience to maintain his 100% record against Sinner this year, having previously beaten him at Indian Wells and Roland Garros.
"I never lost hope. Honestly I knew that every tie-break Jannik plays is almost on his side," Alcaraz said of the decider.
"I thought that in the third set, I'm not going to lie down after two mini-breaks for him. I thought, 'okay, I have to give everything that I have just to try to give myself the opportunity to be close'.
"During the whole week I've been playing great tennis. Probably sometimes the luck went to my side a little bit in the matches."
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