Japan's Naomi Osaka was left in tears after Madison Keys came from behind to beat the 18-year-old and book her place in round four of the US Open.
Osaka led 5-1 in the final and deciding set before collapsing under the pressure and handing the American a 7-5 4-6 7-6 (7/3) triumph in Arthur Ashe Stadium.
Osaka, ranked 81st in the world, admitted afterwards that she grew tense as she tried to secure the victory: "At 5-1 I was just very nervous. I kind of wanted to close it out. I felt like I could rely on my serve at that point because I think she was serving at 5-1.
"It didn't really bother me that she held serve at that time but it really started freaking me out when she was going 5-2, 5-3, 5-4, those times."
As for Keys, who will now face Caroline Wozniacki in the last 16, she admitted that it was the best comeback win of her career: "I think just because this is the biggest stage that I have done it on.
"I think I easily could have let a lot of emotions get in the way of being able to come back.
"Being able to kind of block out everything and just really fight through it and get back into the match, I was really proud of myself for that."