Former champion Lindsay Davenport withdrew before her second-round match at Wimbledon on Thursday with an injured right knee.
The 32-year-old American pulled out before her scheduled match on Court 3 against Argentina’s Gisela Dulko, who advanced to the third round by walkover.
Davenport, the 1999 champion, hobbled past Renata Voracova 6-3, 5-7, 6-3 in her opening match on Tuesday with her knee heavily taped.
She had been idle for two months after sitting out the claycourt season and had pulled out of a grass-court warmup tournament at Eastbourn last week due to the same problem.
It was Davenport’s 13th visit to Wimbledon.
She was seeded 25th despite playing only seven tournaments this season in her comeback after leaving the women’s tour in late 2006 to have her first child, a son named Jagger.
“This is my favorite Slam of them all, because of the relative low-keyness,” Davenport said last weekend.
“I love staying where we can walk to the club and have nice quiet dinners.
“I’m an American but the US Open is a much more hectic lifestyle and pace. This one is much more serene.”
Davenport beat seven-time champion Steffi Graf in the ’99 final and was runner-up in 2004 and ’05. She had not lost before the quarterfinals since 1997.