Third seed Stan Wawrinka was forced to stave off a match point before booking his place in the fourth round of the US Open.
Wawrinka edged a hard-fought five-setter against Dan Evans 4-6, 6-3, 6-7 (8), 7-6 (10), 6-2.
The Swiss faced a match point in the fourth set tiebreaker, but capitalized on some serving jitters from Evans to remain alive before storming home in the final set.
After losing the opening set, Wawrinka recovered to level matters only to go behind once more when Evans held firm in a third-set tiebreaker. With neither player able to make the most of multiple service breaks in the fourth, a tiebreaker was once again required.
Serving at 8-7 up in breaker, Evans had the match in his hands, but Wawrinka produced a superb volley to get out of jail and proceeded to take the set.
The two-time grand slam winner then reeled off for straight games at the start of the set to take control of the decider before some late controversy.
Evans was visibly struggling with an injury, but was refused a medical timeout when the physio ruled he had cramp, an aliment which is no longer treatable during a timeout.
“I know when I’m cramping,” Evans shouted at the chair umpire. “It’s not cramp. I went over on my ankle. It’s crap. You’re all good friends, aren’t you.”
The Briton appeared to be invigorated by the incident and drew one break back, but the damage was done and Wawrinka wrapped up the set 6-2 and with it the match.
Speaking after the match, Wawrinka said: "I think I showed unbelievable fight tonight. Saving match point was tough. He's really talented, was pushing me a lot and there was a lot of pressure to stay in the match.
"I tried to dictate play a bit more at the end but I am really happy to finish like that. I had to stay positive and find some mental fight to stay in the battle."
Wawrinka will play Illya Marchenko in the last 16 after the Ukrainian was the beneficiary of Nick Kyrgios' unfortunate injury-enforced retirement.