GUANGZHOU, China (AP) - Top-seeded Marion Bartoli of France and sixth-seeded Monica Niculescu of Romania were knocked out in the first round of the Guangzhou Open on Tuesday.

Taiwanese qualifier Kai-Chen Chang was leading Bartoli 4-3 when the Frenchwoman retired with an injury. Mathilde Johansson of France defeated Niculescu 7-5, 6-2. The 27-year-old Johansson won despite 12 double-faults.

Second-seeded Zheng Jie of China, third-seeded Sorana Cirstea of Romania and fourth-seeded Urszula Radwanska of Poland also advanced.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.