Serena Williams earned a 6-0, 6-3 first-round victory over Ukraine's Alona Bondarenko at the Rogers Cup on Tuesday.
The 13-time major winner got through the first set in 16 minutes using her speed and power, as a bewildered Bondarenko scattered across the court helplessly.
Bondarenko put up more resistance in the second, but could do little to contain Williams' imposing serve and forehand.
Canadians Stephanie Dubois and Aleksandra Wozniak also advanced with first-round victories.
Dubois earned a 7-6 (4), 6-1 win over German qualifier Kathrin Woerle to set up a second-round match against fourth-seeded Victoria Azarenka, while Wozniak cruised past Israel's Shahar Peer 6-1, 6-0.
No. 10-seeded Andrea Petkovic ousted another Canadian, overcoming a rain delay lasting more than three hours before beating 17-year-old wild-card entry Eugenie Bouchard 6-2, 6-2.
Former champion Ana Ivanovic of Serbia had a 6-1, 6-1 win over Chinese qualifier to advance to the second round here for the first time since 2007.
In other action Tuesday: Roberta Vinci beat Yanina Wickmayer 6-4, 6-2; China's Shuai Peng eliminated Spain's Lourdes Dominguez Lino 6-1, 7-5; and Spaniard Anabel Medina Garrigues defeated Italy's Sara Errani 7-5, 6-1.
Serbia's Bojana Jovanovski won against Jelena Dokic after the Australian retired in the first set; Italy's Flavia Pennetta was a 6-3, 6-1 winner over Russia's Maria Kirilenko; and Slovakia's Daniela Hantuchova won 6-3, 6-4 over Argentina's Gisela Dulko.