LONDON (AP):

French Open champion Rafael Nadal was knocked out of the Queen's Club grass-court championships Friday, losing 7-5, 7-6(0) to the 106-ranked Nicolas Mahut of France.

Nadal, looking sluggish throughout the match, was broken in the last game of the first set and then failed to win a single point in the tiebreaker. Mahut, who entered the match with a singles record of 6-11 this year, had a look of disbelief on his face after sealing the win with a shot that bounced off the edge of the net, arching past Nadal's racket.

Mahut will face Arnaud Clement of France, who defeated Croatia's Ivo Karlovic 7-5, 6-4 in another quarter-final.

Second-seeded Andy Roddick also advanced to the semi-finals, after beating Marin Cilic of Croatia, 6-4, 7-6 (5). Roddick held off a break point at 5-4 with a service winner to take the first set, but then had to fight back from 1-4 in the second as he failed to find any consistency.

"I played spotty today," Roddick said. "I was a little bit sloppy with some of the errors. If I want to get through two more matches and try to win this tournament again, I'll have to do better than that."

The American, who is aiming for his fourth title at Queen's, will face Dmitry Tursunov, who rallied from 2-4 in the final set to upset third-seeded Fernando Gonzalez 6-3, 6-7 (5), 6-4.