Wimbledon, England ? Three-time finalist Andy Roddick was stunned in the fourth round at Wimbledon on Monday by an 82nd-ranked Taiwanese player who hadn’t won a match here the past four years.

The fifth-seeded American was ousted, 4-6, 7-6 (3), 7-6 (4), 6-7 (5), 9-7, by Yen-hsun Lu in a match that lasted more than 4 1/2 hours.

Lu sealed the victory in the 16th game of the fifth set with his only service break of the match.

Roddick had 38 aces, but converted only one of eight breakpoint chances. Lu finished with 22 aces.

“I thought he served better than he has against me before,” Roddick said. “That being said, I had shots. I didn’t take advantage of them.”

Lu’s win overshadowed victories by Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray on the men’s side, and the Williams sisters and Kim Clijsters among the women.

Defending women’s champion Serena Williams overcame Maria Sharapova, 7-6 (9), 6-4, to reach the quarterfinals and avenge her loss to the Russian in the 2004 final.