MONTREAL (AP) -- Top-ranked Victoria Azarenka withdrew from the Rogers Cup on Friday because of a knee injury.

Azarenka, who had a first-round bye, was tied 3-3 in her second-round match against Tamira Paszek when it was suspended by rain Thursday night.

The 23-year-old Belarusian won two Olympic medals in London, taking gold in mixed doubles and bronze in singles.

Meanwhile Petra Kvitova of the Czech Republic dispatched Marion Bartoli 6-1, 6-1 at Uniprix Stadium.

Kvitova advanced to the quarterfinals where she will face the winner of the third-round match between Paszek and Carla Suarez Navarro.

Azarenka joins second-ranked Maria Sharapova, who withdrew Wednesday because of a virus.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.