Jack Draper was immediately sick after clinching his first-ever win in the main draw at the Australian Open.
The 22-year-old Brit came through a gruelling five-set match against Marcos Giron in the first round in Melbourne.
Draper came back from two sets to one down to beat his American opponent in three hours and 20 minutes.
He won the last two sets 6-0, 6-2 and will face Tommy Paul in the second round.
Jack Draper threw up immediately after his win at the Australian Open
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Both players were flagging due to the intense heat at the first Grand Slam of 2024.
It was Draper who eventually came out on top in a huge physical test for the youngster.
After hitting a left-handed winner to seal the match, Draper almost fell to his knees before walking to the net to shake hands with Giron.
Giron was taking his time to get to the net, with Draper making it evident he was in a hurry.
He didn't have time to shake hands with the umpire as he quickly ran to a bin beside the court to be sick.
Draper was also attended to by medics after his marathon win.
He had earlier called for the physio after the second set and had his blood pressure checked.
Draper has faced questions over whether he has the stamina for five-set matches.
But he answered them in brutal style on Tuesday.
Draper headed into the tournament having missed out on a first ATP Tour title at the Adelaide International.
He won the first set against Jiri Lehecka in Saturday's final but eventually succumbed to the Czech star.
Despite that disappointment, Draper showed that he was in good form heading to Melbourne.
Draper again won the first set against Giron but lost the next two to put him on the brink of an early exit.
His coaching staff urged him to keep points short in the 30-degree heat.
And he dug deeper than he ever has before to pull out an extraordinary win.
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Jack Draper was put through the mill in his first round match
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Meanwhile, British No 1 Cam Norrie got his campaign off to a fine start.
He beat Peru's Juan Pablo Varillas 6-4 6-4 6-2 in two hours and 15 minutes.
Norrie's match started at 11am but temperatures were still at an extreme level.
The 28-year-old will face Italian Giulio Zeppieri in the second round.
Norrie was happy with how he performed and believes he coped with the heat well.
He said: "I do like playing in the warmer conditions when it's bouncy, the ball's bouncing around and it's travelling.
Cam Norrie was also victorious in the first round
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"I like to play first, as well. So I was coming from Auckland and in the right time zone to play first.
"I was up pretty early. I think it was hot, but I think I managed it, and I felt better and better as the match progressed.
"I think I really did the basics well today.
"Especially managed my service games well and I think that was the difference in the match.
"It was not easy to play at all.
"It was really quick conditions, and the court was moving around quite a lot with the wind. Happy to be through.”
