Top seed Ashleigh Barty moved into the quarter-finals with a three-set win over Shelby Rogers while Petra Kvitova and Garbine Muguruza exited in the Round of 16 of the Volvo Car Open in Charleston.
World number one Barty was pushed all the way by 52nd ranked Rogers, with both players trading breaks in the final set, before the Australian prevailed 7-6 (7-3) 4-6 6-4.
The victory extends Barty's winning streak to eight matches having won last week's Miami Open.
Barty won 82 per cent of first serve points and sent down 10 aces to get the edge on the American, who saved eight of 13 break points throughout the match.
"The conditions are difficult. It's pretty quick," Barty said in her on-court interview post-game.
"Shelby was able to control the centre of court for a lot of the match. It was about trying to get control when I could. She's an exceptional player, it's always a fight no matter what surface or where we are in the world. It's always one that I enjoy."
Barty will play Spaniard 71st ranked Paula Badosa in the quarter-finals after she beat Caty McNally 6-3 6-3.
Third seed Kvitova was the major casualty on Thursday, losing 6-4 6-1 to Montenegrin Danka Kovinic.
The first set was tightly fought before Kovinic pulled away as Kvitova's errors mounted.
"We both have pretty big serves and she's very good hitting from the baseline," Kovinic said post-game. "Today it was the key that I tried, and did it really well, to take her pace of the ball and use her energy."
Sixth seed Garbine Muguruza also bowed out injured, despite leading 6-0 2-2 against 11th seed Yulia Putintseva.
Muguruza laboured for a few games after a medical time-out before retiring with a left leg injury. Putintseva will next face Kovinic.
Seeds Ons Jabeur, Veronika Kudermetova and Cori Gauff also progressed to the last eight, while Sloane Stephens won in straight sets against Ajla Tomljanovic.
Meanwhile at the Copa Colsanitas second round in Bogota, seventh seed Tereza Martincova was knocked out, going down 6-3 6-3 to Colombian teenager Maria Osorio Serrano.
On the outdoor clay courts, fifth Tamara Zidansek moved into the quarter-finals with a 6-2 6-3 win over Giulia Gatto-Monticone, while Harmony Tan beat Daniela Seguel.
Sinner revels in 'special feeling' after confirming year-end number one ranking
Jannik Sinner says it is a "special feeling" to confirm the year-end number one spot following his Shanghai Masters semi-final win.
Sinner is the first Italian to end a calendar year as number one, having clinched the top ranking with a 6-4 7-5 win over Tomas Machac.
He will face Novak Djokovic in his maiden Shanghai final, and his fourth consecutive showpiece, though he lost the most recent in Beijing to Carlos Alcaraz last week.
Sinner (2023-24) has become only the third player in the Open Era to reach seven or more ATP event finals on hard court in consecutive seasons after Roger Federer (2004-07 and 2014-2015) and Novak Djokovic (2011-13 and 2015-2016).
Sinner, who has 64 wins under his belt this season, is the 18th player to end the year as the top-ranked player and said he has fulfilled a childhood dream in doing so.
"It's amazing. It's something you dream of when you are a kid, when you are young, just to reach the number one," Sinner told Sky Sports.
"Now having the year-end, it's also a different and special feeling.
"It means so much to me, obviously. This is something I could not accomplish without all the people I have around — the family and friends and also a big credit to my team."
Djokovic hoping 'stern' Fritz test is ideal preparation for Sinner showdown
Novak Djokovic expressed his relief at reaching the Shanghai Masters final, saying his win over Taylor Fritz pushed him to his limits on Saturday.
Djokovic kept his hopes alive of claiming a 100th tour-level title with a battling 6-4 7-6 (8-6) triumph over the American after overcoming a hip issue at the end of the second set.
The 37-year-old required a medical timeout in the closing stages of his almost two-hour-long battle but returned to the court to reach his fifth showpiece match in Shanghai.
In doing so, Djokovic surpassed Andy Murray (four) for the outright most finals reached at the event, while also extending his unbeaten run against Fritz to 10 matches.
But the 24-time grand slam champion acknowledged the challenges he faced against Fritz, who threatened to take the encounter the distance.
"It always takes it out of me, these kinds of battles, but particularly towards the end of the tournament," said Djokovic.
"At this stage of my career, I’m doing my best to recover, and I had some issues here and there on the court, physically, yesterday and today. But I managed to overcome it.
"It was a stern test. Taylor is in form, playing probably the best tennis of his life coming off a grand slam final, and he's playing really well, particularly on this surface.
"He's serving big, so I knew it was going to be a big test for me. I did not want to get to a third set, and I'm just glad to overcome in two.”
The Serbian's victory set up a meeting with world number one Jannik Sinner, who beat Tomas Machac 6-4 7-5 in the other semi-final.
It will be the pair's first meeting since their final four clash at the Australian Open earlier this year, a contest Sinner would go on to win his maiden grand slam title.
But having performed well at his first tournament since his US Open exit, Djokovic is hoping to join Jimmy Connors and Roger Federer in the 100 club against a player he described as "the best in the world."
"I came to Shanghai after five years of not playing in China, the place where I've always had great success, both in Shanghai and Beijing," said Djokovic.
"[I've won] many titles, had great battles and great performances. I’ve said it many times, the support that I get here is tremendous, and I'm very grateful.
"That creates an energy that keeps me going, keeps me running, so I did come here definitely with a vision and a desire to get to the final and fight for a 100th title.
"I get that chance against the best player in the world, and let's see what happens."
Zheng sets up Sabalenka meeting after reaching first WTA 1000 final in Wuhan
Zheng Qinwen is through to the Wuhan Open final after a straight-sets win over Wang Xinyu.
In a historic, first-ever all-Chinese semi-final at a WTA 1000 event, Zheng reached her first such final, prevailing 6-3 6-4.
There was little to separate the two in the opening exchanges – just as Zheng edged in front with the first break in the fourth game, Wang responded, levelling the scores back at 3-3.
However, Zheng rallied, successfully defending a break point on her way to winning the last three games in a row to take the first set.
Wang faced 12 break points throughout the match, but failed to defend one in the second-set opener, before protecting three as she took a 2-1 lead.
Despite her fight, the Olympic gold medallist dug deep once more, getting two back-to-back breaks in order to clinch clinching the match.
She will face Aryna Sabalenka, who has never lost a match in Wuhan, in the final on Sunday.
Data Debrief: Home favourite
It has been a banner year for Zheng, who is also still in with a chance of qualifying for the WTA finals. Including the Olympics, she has reached the final of four events during 2024, the most she has managed during a single season.
Only Qiang Wang and Shuai Peng (four each) have made more WTA level finals on Chinese soil than Zheng (three, Zhengzhou and Zhuhai in 2023 and Wuhan in 2024) among Chinese players in the Open Era.
In fact, Zheng is just the second Chinese player to reach the final of a WTA 1000 event since the introduction of the format in 2009, after Li Na.
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