Elise Mertens twice came back from the brink to beat Simona Halep and reach a Madrid Open quarter-final against former doubles partner Aryna Sabalenka.
Third seed Halep was the highest-ranked player in action on Wednesday but came unstuck against Mertens despite taking the opener and leading by a break in each of the subsequent sets.
Mertens emerged a 4-6 7-5 7-5 winner after two hours and 34 minutes, defeating Halep for the first time on clay and only the second time on any surface.
There were opportunities for both players throughout and Halep struck first, losing her break lead in the first but recovering on this occasion.
The Romanian, a two-time winner who has also twice lost in the final in Madrid, twice cancelled out a deficit in the second but could not then capitalise on a lead of her own.
Mertens battled back and broke to love to level the match, then maintained her composure to see out a back-and-forth decider once Halep had again forged ahead.
"She played really well, and she definitely deserved to win because she was stronger in the end," Halep said.
"I cannot say I played bad, but I did some mistakes, important mistakes. Sometimes it's just a little bit and the match is going away."
Sabalenka is up next for Mertens, although she had a much more straightforward path through the third round.
Jessica Pegula held her up for only 52 minutes in a dominant 6-1 6-2 success.
In the same half of the draw, Anastasia Pavlyuchenkova upset another seed, following up her straight-sets victory over Karolina Pliskova by beating Jennifer Brady in three. She plays Karolina Muchova next.
At L'Open 35 de Saint-Melo, second seed Rebecca Peterson came from behind to see off Xiyu Wang, while Tamara Zidansek and Arantxa Rus also produced comebacks.
Nina Stojanovic survived three sets, but Christina McHale crashed out to Viktoriya Tomova.
'A part of me left with them' says Djokovic after Nadal, Murray retirements
Novak Djokovic said a part of him had "left" after Rafael Nadal followed his other great rivals Roger Federer and Andy Murray in announcing his retirement.
Djokovic enjoyed a long-lasting rivalry with Nadal, along with Federer and Murray, with tennis' 'Big Four' winning a combined 69 grand slam titles.
The Serbian is currently aiming to join Federer and Jimmy Connors as the only players to achieve 100 ATP Tour-level titles, and is two games away from doing so at the Shanghai Masters.
Djokovic overcame a plucky display from Czech teenager Jakub Mensik on Friday, coming from a set down to win 6-7 (4-7) 6-1 6-4 and progress to a record 77th semi-final at Masters 1000 events.
The triumph came a day after Nadal confirmed he would retire next month, following 60 head-to-head meetings with Djokovic, the latest coming at the Paris Olympics earlier this year.
Djokovic won 31 of those encounters, with four coming in grand slam finals at the US Open, Wimbledon and the Australian Open.
With Federer announcing his retirement in 2022 and Murray calling time on his career after the Olympics, Djokovic will soon be the only active player from the 'Big Four' that dominated the sport for many years.
And while the Serbian is still enjoying his tennis, he got emotional at the "overwhelming" feeling of being the last man standing.
"He has been my greatest rival and my rivalry with him has impacted me the most in my career by far," Djokovic said.
"We knew that moment is coming sooner than later but it's still a shock.
"When it came officially for Roger a few years ago as well, when he announced retirement and Andy as well this year. It's overwhelming for me to be honest.
"I don't know what to make of it. I still enjoy competing but part of me left with them. A big part of me. It's tough news for the tennis world, the sports world.
"Rafa is an inspiration to millions of children around the world so he can be very proud of his career."
Djokovic to monitor Mensik after fighting back in Shanghai thriller
Novak Djokovic said Jakub Mensik was one to watch after being forced to fight from a set down to beat the teenager in a dramatic Shanghai Masters quarter-final on Friday.
Djokovic prevailed 6-7 (4-7) 6-1 6-4 in two hours and 19 minutes to maintain his quest for a 100th ATP Tour-level title, advancing to a record 77th semi-final at Masters 1000 events.
Though he lost control in the second set, Mensik advanced his reputation as an elite server by registering 17 aces to Djokovic's seven throughout the course of the contest, with seven of those arriving in the opening set.
The Czech, ranked 65th, had defeated world number six Andrey Rublev and number nine Grigor Dimitrov en route to the last eight, and Djokovic was impressed by the fight he put up.
"We went toe-to-toe until the last moment," Djokovic said. "I was fortunate to find great serves in the last game, a couple of aces, that helps.
"I didn't serve that well at the end of the first set when I was serving for it. He managed to turn things around by playing a good tie-break."
Asked about Mensik's potential, Djokovic said: "I could see today why he is one of the best servers we have in the game.
"He is only 19, the future is very bright for him. He knows that I am always there for him, whatever he needs.
"Jakub is somebody that I have been following for the last three or four years, ever since he played the junior finals of the Australian Open.
"We like playing each other, we raise the level when we face each other. We've played a lot of practice sets and it's always fun."
Djokovic will now face Taylor Fritz in the semi-finals on Saturday, with a spot in Sunday's final – against Jannik Sinner or Tomas Machac – on the line.
Zheng to face Wang in first all-Chinese WTA 1000 semi-final in Wuhan
World number seven Zheng Qinwen will face Wang Xinyu in the first all-Chinese semi-final at a WTA 1000 event on Saturday, following the duo's quarter-final victories on Friday.
Zheng overcame Wimbledon and French Open runner-up Jasmine Paolini 6-2 3-6 6-3 in the last eight of the Wuhan Open, teasing several errors out of the Italian in the deciding set of a big-hitting encounter.
She has now won more matches since the end of Wimbledon (23) than any other player on the WTA Tour, and her next opponent will be compatriot Wang.
Wang came through a gruelling encounter with Ekaterina Alexandrova earlier on Friday, saving two match points en route to a 4-6 6-4 7-6 (8-6) victory.
Making her first WTA 1000 semi-final, the world number 51 is the second-lowest ranked player to ever reach that stage in Wuhan.
The winner of Saturday's tie will take on either Aryna Sabalenka or Coco Gauff in the final, with both players bidding to become the first Chinese player to go all the way at the tournament.
Data Debrief: Rare home contest in the offing
Since the inception of WTA 1000 events in 2009, only two local pairs have met in a semi-final match in the format, ahead of Zheng and Wang becoming the third this weekend.
Serena and Venus Williams faced off in Miami in 2009, while Madison Keys and Sofia Kenin battled it out in the final four of the 2019 Cincinnati Open.
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