British number one Johanna Konta has progressed into the third round of the US Open at Flushing Meadows after defeating the unseeded Bulgarian Tsvetana Pironkova in three sets.
However, it wasn't easy for the 25-year-old, who collapsed on court after suffering from blurred vision, which meant she struggled to control her breathing and rocketing heart rate.
Konta was forced to her knees and began hyperventilating and had to wait several minutes for medical assistance from the trainer.
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"My heart rate spiked and I couldn't really control my breathing," she said.
"It was basically very embarrassing. I started hyperventilating. I started shaking. That's why I went down on the ground, because I was quite violently shaking."
Playing on Court 13, an outside court that was very exposed to the sun, Konta admitted that she certainly hit her limits.
The hot and humid conditions have been causing issues for the entire tournament and are taking their toll on even the fittest players. Few are fitter and stronger on the WTA than Konta.
Konta received ice bags to help cool her body from the chief umpire, and waited for assistance from the doctor before making her way back to her chair.
She returned after an increased medical timeout to lose the second set, but managed to eventually fight back and win the final set in 50 minutes, which secured her progression into the third round.
You can see the video of Konta collapsing below.
Her Bulgarian opponent Pironkova was becoming a threat to Konta, and as the Brit collapsed, she had a set point to level the match, which she capitalised upon on the restart.
But, the 71st ranked player in the world struggled in the third set and bemoaned the length of the medical timeout.
"I wish I could say all players use bathroom breaks accordingly to go to the toilet,"
"Some players use them to refocus. I don't think they should be used that way."
"With that toilet break, I think the match was stopped for just too long. I had my momentum going, I was getting back in the match."
British number one Konta will play Swiss 24th seed Belinda Bencic in the third round on Friday.