Canadian Denis Shapovalov has given a brutally frank response after being denied a toilet break during his four-hour marathon on Monday night.
Shapovalov said he was worried about having to relieve himself on the court after the chair umpire ordered him back onto the court.
The tense moment came after Shapovalov had conceded the fourth set with the match on a knife-edge.
"What happens if I go? Do I get a fine? I don't care," he said.
"What do you mean I can't go? Are you going to disqualify me? I have to pee.
"I'm going to p*** my pants. I'm going to p*** in a bottle."
After winning the match in five-sets, Shapovalov insisted his bathroom emergency was genuine and nowhere near an attempt at gamesmanship to stop opponent Jannik Sinner's momentum.
"I was just blowing off steam, just kind of cooling my head, getting rid of it," he said.
"But also, I do think it's a dumb rule. Especially for me, I've got the smallest bladder ever, so I literally got to take a p*** every set. So it's difficult, especially when you're on that court for so long.
"Before the match I'm trying to hydrate as much as possible, so yeah, I gotta pee, man."