In other matches, Maria Sharapova thrashed America's Mallory Burdette 6-1 6-1 to advance to the last 16, while fifth seed Petra Kvitova from Czech Republic beat France's PaulineParmentier 6-4 6-4.
Bethanie Mattek-Sands defeated Alize Cornet 7-6 (9-7) 7-5 for her first singles win in the women's teams tournament, while Melanie Oudin beat debutant PaulineParmentier 6-4 6-4 in the second rubber.