Australian Sam Stosur has been bounced out in the second round of the Rogers Cup in Montreal, beaten in straight sets by unseeded Russian Daria Kasatkina.

Stosur, seeded 13th for the WTA tournament, struggled with her service game as she sent down nine double faults in the 7-6 (7-1) 6-3 loss.

Comparatively, world No.33 Kasatkina served eight aces in the win, and will go on to meet Italian Roberta Vinci who beat compatriot Giorgi Camila.