Toronto's Rodgers Cup lost two seeds on the opening day as French pair Amelie Mauresmo and Marion Bartoli both crashed out.

Number 13 seed Bartoli crashed out in straight sets, with Ukraine's Alona Bondarenko taking a 6-4 6-3 win, while Mauresmo, seeded 15, went down 6-2 3-6 1-6 Italy's Francesca Schiavone.

The other seed in action, number 14 Agnieszka Radwanska progressed with a 6-3 6-3 win over Carla Suarez Navarro.

Meanwhile, Russia's Maria Sharapova overcame compatriot Nadia Petrova 6-3 6-4.

Elsewhere in the first round Aravane Rezai beat Alize Cornet 6-4 7-5, Swiss Patty Schneider eased past Anabel Medina Garrigues 6-2 6-1 and Ai Sugiyama bested Iveta Benesova 6-3 6-4.

Kateryna Bondarenko is through after seeing off fellow qualifier Yanina Wickmayer, Agnes Szavay beat Valerie Tetreault and Roberta Vinci cruised past Stephanie Dubois 6-1 6-2.

Sybille Bammer and Samantha Stosur are also through after winning their opening matches against Anna Chakvetadze and Heidi El Tabakh respectively.