Sebastian Korda said he could barely hold the racquet before retiring in the Australian Open quarter-finals Tuesday, but despite the disappointment is confident of "really big things" ahead.
He said he first felt the injury while playing the Adelaide International this month, where he made the final and forced a championship point before being beaten by Novak Djokovic.
But it had not bothered him in the opening four rounds at Melbourne Park until he hit a return in the second set.
"I had it in Adelaide and then it went away completely. Now it just came back out of nowhere," he said. "I have never had any wrist issues before.
"I knew kind of what it was right away, right when I hit the return. I kind of felt that spot that I was feeling before.
"Some forehands I couldn't even hold the racquet. Volleying was almost impossible for me, so it was a little tough."
Despite the pain of defeat, it was a hugely successful Australian Open for Korda, who made a Grand Slam quarter-final for the first time.
Along the way he stunned two-time losing finalist and seventh seed Daniil Medvedev and world number 10 Hubert Hurkacz.
"There is a lot of positives. I mean, way more positives than even negatives," he said.
"Today was tough, but hopefully it's nothing serious and I can take care of it so I don't have it in the future.
"Still a great tournament. My first quarter-final in a Grand Slam. You know, I'm going to go forward with my head high and keep working."