Defending champion Wozniacki looked set to force the match into a third and deciding set after building a 5-1 lead in the second , but her Italian opponent rallied to clinch her first victory against a top-five ranked player . Top seed Vera Zvonareva is out of the Rogers Cup following a defeat to Caroline Wozniacki . French Open champion Li Na and Petra Kvitova winner Wimbledon claim their 2nd rd matches . Maria Sharapova , Serena Williams and Vera Zvonareva also advance in star-studded event .
Top seed Vera Zvonareva is out of the Rogers Cup following a defeat to Caroline Wozniacki . French Open champion Li Na and Petra Kvitova winner Wimbledon claim their 2nd rd matches . Maria Sharapova , Serena Williams and Vera Zvonareva also advance in star-studded event .