Laura Robson of Britain topped second-seeded Zheng Jie of China 6-3, 6-3, and the remaining seeds breezed into the quarterfinals of the Guangzhou Open on Wednesday.
Robson has had a successful summer. She reached the fourth round of the U.S. Open and won a silver medal at the London Olympics with Andy Murray in mixed doubles.
In other matches, defending champion Chanelle Scheepers of South Africa completed a 6-4, 6-1 victory over Bojana Jovanovski of Serbia, while Urszula Radwanska of Poland defeated Mandy Minella of Luxembourg 6-2, 6-3.
Among the others to advance were third-seeded Sorana Cirstea of Romania, No. 7 Peng Shuai of China and No. 8 Alize Cornet of France.