13 August,2011 07:47 AM IST | | AFP
Wimbledon champion Petra Kvitova, French Open winner Li Na and fifth seed Maria Sharapova crashed out of the Toronto WTA tournament on Thursday as the top seeds tumbled.
Sharapova
American Serena Williams avoided joining them after rallying from behind to beat Zheng Jie and win through to the quarter-finals.
Czech seventh seed Kvitova, 21, who recently recovered from a thigh injury, was beaten 6-1, 6-2 by Germany's Andrea Petkovic. Sixth seed Li went out 6-2, 6-4 to Australian Samantha Stosur. Sharapova went down 6-3, 7-5 to Kazakh qualifier Galina Voskoboevau00a0 ranked 135th in the world.
