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Andrea Petkovic

Serena Williams advances in Rogers Cup

Serena Williams advances in Rogers Cup

Top-ranked Serena Williams advanced to the Rogers Cup quarterfinals in Toronto on Thursday night, beating 16th-seeded Andrea Petkovic of Germany, 6-3, 6-2.

The 21-time Grand Slam singles champion will face Italy's Roberta Vinci, a 6-4, 6-3 winner over Russia's Daria Gavrilova.

Williams won titles in Toronto titles in 2001, 2011 and 2013.

Second-seeded Simona Halep of Romania advanced, outlasting 13th-seeded Angelique Kerber of Germany, 6-3, 5-7, 6-4.

Halep will face sixth-seeded Agnieszka Radwanska of Poland, a 6-2, 4-6, 6-4 winner over...