Sharapova , seeded fifth , will play Gaina Voskoboeva after the qualifier beat Italian Flavia Pennetta . Top seed Caroline Wozniacki is out of the Rogers Cup following a defeat to Roberta Vinci . The Dane was beaten 6-3, 6-4 by the Italian in her first match since winning Wimbledon last month. Maria Sharapova , Serena Williams and Vera Zvonareva also advance in star-studded event .
Top seed Caroline Wozniacki is out of the Rogers Cup following a defeat to Roberta Vinci . The Dane was beaten 6-3, 6-4 by the Italian in her first match since winning Wimbledon last month. Maria Sharapova , Serena Williams and Vera Zvonareva also advance in star-studded event .