Emma Raducanu played down an uncomfortable practice session in New York, saying she just had "one of those weird days" before she begins her US Open title defence.
Raducanu, 19, seemed to be struggling with a wrist injury and appeared to be upset at one point in Friday's session.
But the British number one said there was nothing seriously wrong before her opening match against Alize Cornet.
"It was one of those blips where you don't know what is going on," she said.
"I can't really explain it, just one of those days when you have certain small things that are niggling away.