Jie Zheng was the only seed to fail to advance from the second round of the Guangzhou International Open today.
The Chinese second seed was denied a place in the last eight by Britain's Laura Robson, who secured a 6-3 6-3 success by clinching five of her six break-point opportunities.
Robson, 18, who reached the fourth round of the US Open, will now face seventh seed Shuai Peng in the last eight, after the home favourite breezed to a 6-2 6-1 win over qualifier Nudnida Luangnam.
Third seed Sorana Cirstea defeated wildcard Ying-Ying Duan 6-1 7-6 (7-0) to set up a quarter-final clash with French eighth seed Alize Cornet, who advanced when Olga Govortsova retired hurt after losing the first set of their contest 6-4.
Chanelle Scheepers beat Bojana Jovanovski 6-4 6-1 while her next opponent, Urszula Radwanska, was also a straight-sets winner as Luxembourg's Mandy Minella was dispatched 6-2 6-3.
Taiwan's Su-Wei Hsieh beat compatriot Kai-Chen Chang 6-0 6-3. France's Mathilde Johansson overcame a second-set wobble to triumph 6-2 4-6 7-5 over China's Saisai Zheng.