Conchita Martinez, still seeking her first tennis title of the year, advanced to the quarterfinals of the Bank of the West tournament in Stanford, Calif., with a 6-1, 6-1 victory over Amy Frazier.
Second-seeded Monica Seles overcame a sluggish start by winning nine straight games and defeated Rita Grande, 6-2, 6-1.
In Montreal, officials of next week's du Maurier Open said world No. 1 Pete Sampras has withdrawn from the tournament due to an arm injury.
In Los Angeles, top-seeded Goran Ivanisevic used his powerful serve to beat Olivier Delaitre of France, 7-5, 7-6 (7-2), and advance to the quarterfinals of the $303,000 Infiniti Open.