Barbora Krejcikova explained she was hit by breathing difficulties and a spell of severe dizziness as she overcame Garbine Muguruza at the US Open.
French Open champion Krejcikova – who is making her main-draw debut at Flushing Meadows – had to hold off a fightback from former world number one Muguruza on Sunday to progress into her first US Open quarter-final with a 6-3 7-6 (7-4) victory.
However, Muguruza was left angry after Krejcikova started to take more time in between points.
After saving three set points at 4-5 down in the decider, Krejcikova went off court for medical treatment, before returning to see out the match on a tie-break.
Muguruza appeared to confront Krejcikova during the post-match handshake, and the Spaniard told the media: "I'll let you guys judge what you think about this.
"I think, between players, you know a little bit how to behave in certain moments and I wasn't very happy at the end of the match."
Krejcikova, however, explained how she had suffered during the match.
"I think I started the match really well and was playing good tennis," Krejcikova said, according to the WTA.
"The key was to start the match well. There were a lot of breaks, which was difficult, but I was happy that I won the first set 6-3. Out of nowhere I got the lead 4-0 and then things started to get complicated.
"Garbine started to raise her level and I was expecting that. At the end I was really struggling and I feel really bad right now.
"I don't really know what happened, but I couldn't breathe. I started to feel dizzy and the whole world was shaking. It never happened to me before."
Krejcikova also needed medical attention after the match and did not hold a post-match news conference.
The Czech has now won 29 of her last 32 matches and will face Aryna Sabalenka, the highest seed remaining at Flushing Meadows, in the quarter-finals.
Swiatek passes Kerber test to reach Italian Open quarter-finals
Two-time Italian Open champion Iga Swiatek advanced to the quarter-finals of this year's tournament with an impressive 7-5 6-3 win over Angelique Kerber on Monday.
Three-time grand slam winner Kerber provided Swiatek with a real step up after routine victories over Bernarda Pera and Yulia Putintseva in the first two rounds on the clay in Rome.
Kerber responded to Swiatek's first break – which came in the eighth game – with one of her own, but the world number one then recaptured her composure to force a series of break points in Kerber's next two service games, finally converting at the eighth attempt to take the opener.
Kerber refused to go away, breaking straight back in the first game of the second set, but Swiatek upped her game to take the contest away from the 36-year-old.
Swiatek dropped just three further points on her own serve from there, adding three breaks of her own to set up a last-eight meeting with Madison Keys for Tuesday.
Data Debrief: Swiatek unmatched on clay
While Kerber rolled back the years to trouble Swiatek early on, she lacked the staying power to live with the world number one in longer rallies on a surface where she is truly unmatched.
Her win ratio at clay-court events at WTA 1000-level now stands at 88.2 per cent (30 wins, four defeats), the best of any player to have played a minimum of five matches since the format's 2009 introduction, ahead of Serena Williams at 88 per cent.
Osaka sees encouraging Italian Open run halted by Zheng in last 16
Naomi Osaka's promising Italian Open run was halted by Zheng Qinwen on Monday, as the seventh seed denied the four-time grand slam champion a quarter-final place.
Following Saturday's triumph over Daria Kasatkina – her second successive straight-sets win over a top-20 opponent in Rome – Osaka laughed off the "Clayomi" moniker given to her by some fans.
On Monday, her old troubles on the surface came back to the fore as Zheng dominated from the off to make the tournament's last eight for a second straight year, winning 6-2 6-4.
Osaka saw her serve broken in the very first game only to hit straight back, but Zheng assumed control by taking seven straight games to go from 2-1 down in the opener to 2-0 up in the second set.
The 21-year-old produced a clinical performance and converted all four of her break points, winning 78 per cent of first-serve points to Osaka's 68 per cent as she teed up a quarter-final clash with either Coco Gauff or Paula Badosa.
Data Debrief: 'Clayomi' no more as Zheng triumphs
Osaka impressed on a surface long regarded as her worst in Italy, but it was a bridge too far for her on Monday, Zheng reaching her fourth WTA 1000 quarter-final.
Since the format's introduction in 2009, she is just the second Asian player to reach multiple quarter-finals on both hardcourts and clay at that level before the age of 23, the other being Osaka.
Djokovic bemoans 'completely off' performance after early Italian Open exit
Novak Djokovic lamented his dismal showing as Alejandro Tabilo profited from the world number one's "completely off" performance to triumph at the Italian Open.
Tabilo stunned Djokovic with a straight-sets victory in the third round on Sunday, winning 6-2, 6-3 in his maiden ATP Tour clash with the Serbian.
The Chilean advances to the fourth round at a Masters 1000 event for just the second time after Indian Wells in 2023, with Djokovic unable to explain his struggles in Rome.
"I just wasn't able to find any kind of good feelings on the court, to be honest, striking the ball. I was completely off," he said.
A six-time champion in Rome, the 36-year-old won his opening-round match at the ATP Masters 1000 event against Corentin Moutet.
However, Djokovic was inadvertently hit on the head by a falling water bottle when leaving the court after that victory.
Whether that incident impacted his performance against Tabilo remains to be seen.
"I don't know, to be honest. I have to check that," he said. "Training was different. I was going for [a] kind of easy training yesterday.
"I didn't feel anything, but I also didn't feel the same. Today under high stress, it was quite bad – not in terms of pain, but in terms of this balance.
"Just no coordination. Completely different player from what it was two nights ago. Could be. I don't know. I have to do medical checkups and see what's going on."
Tabilo's next opponent will be Karen Khachanov, who saw off Francisco Cerundolo 6-2, 6-4, while Djokovic is made to wait for his 1100th match win.
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