Olympics 2012: Roger Federer reaches quarter-finals

World No1 Roger Federer beat Uzbekistan’s Denis Istomin to reach the quarterfinals of the men's singles tennis competitions of the London Olympics here on Wednesday.

Federer eventually beat Istomin 7-5, 6-3 after coming under pressure in the first set where he was almost broken by the world No35.

The Swiss seven-time Wimbledon champion will now face either 10th seed John Isner of the United States or Serbia’s Janko Tipsarevic, seeded seventh, in the quarterfinals.