Marion Bartoli, Maria Sharapova and Victoria Azarenka advanced to the quarterfinals of the Bank of the West Classic.
Shahar Peer, another seeded player, wasn't as fortunate Thursday
The fourth-seeded Bartoli beat former world No. 1 Ana Ivanovic 6-3, 6-4 for her eighth consecutive victory at the event and 10th win in her last 13 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 second-round action, while Maria Kirilenko knocked off the sixth-seeded Peer 6-4, 6-3.
