World No . 1 playing in third match since winning WTA . Djokovic 's three -set win sets up meeting with Serena Williams . Sam Stosur through to first round at WTA event in Montreal . Defending champion a straight-sets winner over Sam Stosur .
World No . 1 playing in first match since winning Wimbledon . Djokovic 's three-set win sets up meeting with Jo-Wilfried Tsonga . Serena Williams through to third round at WTA event in Montreal . Defending champion a straight-sets winner over Sam Stosur .