Jack Draper says being sick on court in his US Open semi-final defeat was "the worst feeling ever", but he believes Grand Slam success is "just a matter of time".
The Briton vomited three times during his 7-5 7-6 (7-3) 6-2 defeat by world number one Jannik Sinner in New York.
Reaching the last four was the best run of the 22-year-old's career at a major.
"When you're playing long matches, you need to be able to drink and give your body the supplies it needs to keep on going," Draper said.