Montreal (AP): Roger Federer lost for the first time since May against Jo-Wilfried Tsonga by 7-6 (5), 1-6, 7-6 (3) in a dramatic collapse in the Rogers Cup quarterfinals on Friday.

Federer led 5-1 in the third set then lost his serve twice as Tsonga took a 6-5 lead with the sellout crowd of 11,490 at Uniprix Stadium in a frenzy.

``I did not feel real good - 5-1 down and Roger playing well and I had no solutions,'' said Tsonga, who played with a sore right arm he hurt on a dive volley to win the first set. ``I just told myself 'You have to hit the ball one more time than him,' and I did it.''

Federer had to save three match points to force a tiebreaker, and Tsonga used two aces to take a 6-3 lead then Federer double-faulted on match point.

``It's obviously disappointing but you know, that's what Jo does - he doesn't make a return for an hour and then he puts in a few and than all of a sudden he's back in the match,'' Federer said. ``I should never have allowed it but it happened, so it's a pity.''

The world's top-ranked player saw the end of his 21-match winning streak, which included titles at Madrid, the French Open and Wimbledon, where he claimed a record 15th career Grand Slam crown.

Federer took a break after Wimbledon while his wife gave birth to twin girls, and there were doubts about his form coming into the Rogers Cup. But he looked sharp until the end of the third set, when his first serve deserted him and he hit several groundstrokes wild.

``It's great to get some matches in ahead of Cincinnati and the U.S. Open,'' Federer said. ``But my goal wasn't to just to play matches and do press conferences.

``The whole trip here was to do well and try to win the tournament.''

The seventh-seeded Tsonga advanced to a semifinal on Saturday against third-seeded Andy Murray. The Frenchman leads their career series 2-1.

Murray ended Nikolay Davydenko's 12-match winning run with a 6-2, 6-4 victory. Davydenko, seeded eighth, came into the tournament following wins at Hamburg and Umag.

Murray's string of service games won finished at 19 when Davydenko broke him in the fifth game of the first set, but he has still yet to drop a set in the tournament.

``Every time I've played against him, you never feel like you're playing your best tennis because he takes the ball so early,'' Murray said of Davydenko. ``He rushes you. Pretty much every rally, he plays very aggressively. But I had my game plan and I did it really, really well in terms of the way I struck the ball.''

Murray improved to 5-4 against Davydenko to reach the Rogers Cup semifinals for the third time in four years.

Fifth-seeded Andy Roddick beat fourth-seeded Novak Djokovic 6-4, 7-6 (4) for the third time this year. Roddick leads the ATP Tour with 33 tiebreaker wins.

``I've played seven of the last nine days, including last week (in Washington), so when you get to those crucial points, you've got to win them,'' Roddick said.

Roddick is looking to reach a third straight final, after losing to Federer in a five-set thriller at Wimbledon and dropping the final in Washington to Juan Martin Del Potro.

He will face the winner of the late match between defending champion Rafael Nadal and Del Potro.