The Swiss number one played to perfection a day after celebrating a birthday on court, blowing out the candles on Italian qualifier Fabio Fognini 6-1, 6-1 in just 44 minutes.

"People like to say, 'I couldn't get into the rhythm and stuff.' It's not true," he said. "I had a perfect rhythm out there today."

Hot rival Rafael Nadal had to work harder, spending 2hrs 42min in overcoming Frenchman Paul-Henri Mathieu 3-6, 6-3, 6-2.

His first set went longer than Federer's entire match.

Nadal had to save nine break points as he aims to add a second Montreal title to his collection after winning here in 2005. He has not lost to Mathieu in six career meetings.

Serb Novak Djokovic, the number three, was impressive in his third-round encounter, rolling over Argentina's David Nalbandian 6-2, 6-3.

The Wimbledon semi-finalist, who has made a breakthrough this season into the top five, stands one win away from 50 wins this season after lifting three titles.

Embattled Russian Nikolay Davydenko, the fourth seed, won a battle with compatriot Mikhail Youzhny 7-6 (10/8), 6-3, while US fifth seed Andy Roddick downed Cypriot Marcos Baghdatis 6-2, 6-3.

Davydenko's retirement from a match in Poland last week has been the focus of an ATP probe into possible match fixing because of irregular betting patterns on the contest.

Davydenko will next face Czech Radek Stepanek, who ousted German 12th seed Tommy Haas 6-3, 2-6, 6-2.

Federer, chasing his 50th career title just a month after lifting a record-equalling fifth straight trophy at Wimbledon, was utterly dominant against number 139 Fognini, who had dispatched Andy Murray the day before.

With a first set which was over in 18 minutes, the challenger had little hope as Federer won a 14th match on the trot in Canada.

The Swiss won nearly three-quarters of the 37 first-set points, and 13 of 14 on first serves during the run-away.