New Delhi, July 9 -- Taylor Fritz was three games into his Wimbledon quarterfinal against Alexander Zverev when his knee tendinitis started flaring up, and the American knew right away he was in trouble.

"I was just like panicking, 'What am I going to do?'" the sixth-seeded Fritz said. "I just didn't expect it at all."

In the end, there was nothing he could do.

Zverev's serve and the pain in Fritz's knee were too much to overcome as the last American man left in the singles tournament lost 6-4, 6-4, 6-2 on No. 1 Court on Wednesday.

Fritz, who reached the 2024 U.S. Open final after beating Zverev in the quarterfinals, has struggled with knee tendinitis in the past. But he had no indication previously at Wimbledon that it might flare up...