STANFORD, California (AP) — France's Marion Bartoli, Maria Sharapova and Victoria Azarenka of Belarus advanced to the quarterfinals of the Bank of the West Classic on Thursday.

Israel's Shahar Peer, another seeded player, wasn't as fortunate.

The fourth-seeded Bartoli beat former world No. 1 Ana Ivanovic of Serbia 6-3, 6-4, for her eighth consecutive victory at the event and 10th win in her last 13 matches.

Bartoli beat Ivanovic for the first time in four career meetings. Ivanovic fell to 3-6 over her last nine matches.

Former world No. 1 Sharapova, the fifth seed, beat Belarus' Olga Govortsova, 6-3, 6-3 and the eighth-seeded Azarenka topped American Melanie Oudin, 6-3, 6-1 in the second round, while Russia's Maria Kirilenko knocked off the sixth-seeded Peer, 6-4, 6-3.

The 16th-ranked Peer became the first seeded player to fall at the event, losing for the fourth time in her last six matches after opening the year 18-5, which included a three-set win over Kirilenko in New Zealand.