TORONTO: Former world No 1 Maria Sharapova cruised into the second round of the WTA hardcourt tournament here on Monday with a straight sets win over compatriot Nadia Petrova.

The 22-year-old downed 10th seeded Petrova 6-3, 6-4, her third win over Petrova this season. It was another step forward for Sharapova, who had shoulder surgery last October, returned to singles competition in May and is now ranked 49th in the world. In the second round she’ll face Austrian Sybille Bammer, a 3-6, 6-4, 6-2 winner over Russian Anna Chakvetadze.

The top eight seeds, led by world No 1 and defending champion Dinara Safina, enjoy first-round byes in the $2 million US Open tuneup.

Aravane Rezai booked a

second-round clash with

Safina with a 6-4, 7-5 victory over fellow Frenchwoman

Alize Cornet.

Ukrainian Kateryna Bondarenko set up a clash with Wimbledon runner-up Venus Williams — seeded third behind sister Serena — with a 7-6 (7/4), 6-2 victory over Belgian Yanina Wickmayer.

Seeded French players Amelie Mauresmo and

Marion Bartoli were both

first round casualties. Alona Bondarenko of Ukraine downed 13th-seeded Bartoli 6-4, 6-3, while Italian veteran Francesca Schiavone ousted 15th-seeded Mauresmo

6-2, 3-6, 6-1.

Fourteenth-seeded Pole Agnieszka Radwanska moved safely through, downing Spain’s Carla Suarez Navarro 6-3, 6-3. Surging Aussie Samantha Stosur

held off Canadian

qualifier Heidi El Tabakh 7-6 (7/2), 7-6 (7/4) to set up a meeting with the sixth seed French Open champion Svetlana Kuznetsova of Russia.

Switzerland’s Patty Schnyder downed Spain’s Anabel Medina Garrigues 6-2, 6-1 to line up a shot at fifth-seeded Serbian Jelena Jankovic, who beat Safina in the final at Cincinnati on Sunday.