France's Kristina Mladenovic also advanced in the hard-court event at Sierra Madre Tennis Club, topping Russia's Vera Zvonareva 6-4, 6-2.
In late matches, top-seeded Ana Ivanovic of Serbia faced Pauline Parmentier of France, and second-seeded Sara Errani of Italy played Timea Babos of Hungary.
--sapa-
