The 25-year-old Olympic champion dropped just four games on his way to a straight-sets win over Italy's Flavio Cipolla yesterday. However he is expecting the Canadian number one to provide much sterner opposition.
"It will be tough," Murray told atpworldtour.com. "He'll obviously be very motivated playing in his own country.
"He's improved a lot over the last year, year and a half. He's playing really, really good tennis. Very big guy with a big game. Serves well and hits the ball very hard."
Murray has previously won eight Masters 1000 titles, including two in Toronto.