Athens: Leander Paes and Mahesh Bhupathi overcame an injury scare and Switzerland's world number one singles player Roger Federer to advance to the quarterfinals of the men's doubles tennis at the Olympic Games in Athens today (Aug 17, 2004).

A bleeding nose for Paes early in the second set threatened to derail the 'Indian Express' but the multiple Grand Slam champion quickly recovered from the injury to power the 'Indian Express' to a 6-2 7-6 (9/7) victory past Federer and his Swiss partner Yves Allegro in the second round.

The defeat meant the end of Olympic medal hopes for Federer who suffered a shock second round exit in the singles to unseeded Tomas Berdych of the Czech Republic earlier in the day.

The loss was Federer's second in three matches following his first round ouster by another Czech, Dominic Hrbaty, at the Cincinnati Master two weeks ago that ended the Wimbledon champion's 23-match winning streak.

Paes and Bhupathi now play fourth seeds Wayne Black and Kevin Ullyett of Zimbabwe in the last-eight round.

The fifth seeded Indians targeted Yves Allegro who proved to be the weak link in the Swiss camp. They broke him in the third game to go up 2-1 up before Paes was forced to call the trainer.

But once Paes, who was laid down by a brain lesion and was forced out of action for six months last year, recovered from the set back, the duo broke Allegro once more to power their way in the second set.