Davenport, who lost her serve seven times in the match, was helped by her opponent's 13 double faults. She will face Zheng Jie in the next round.

``Zheng is a good player and a top player in China,'' Davenport said. ``Hopefully, I can play better.''

Second-seeded Svetlana Kuznetsova advanced when Jelena Kostanic retired with a thigh injury after trailing 2-1.

Peng Shuai moved on with a 5-7, 6-4, 6-2 upset over eighth-seeded Maria Kirilenko. Marion Bartoli defeated Anabel Medina Garrigues 6-3, 6-3.

Peng will face Ai Sugiyama, who defeated Nicole Vaidisova 6-4, 1-6, 6-3.

``As I was playing at home, the fans gave me a lot of support,'' Peng said. ``From the third set, I found my rhythm.''