
Angelique Kerber of Germany serves during the second round match againt Jelena Jankovic of Serbia at 2015 WTA Wuhan Open Tennis Tournament in Wuhan, capital of central China's Hubei Province, on Sept. 29, 2015. Kerber won 2-1. (Xinhua/Xiao Yijiu)

Angelique Kerber of Germany serves during the second round match againt Jelena Jankovic of Serbia at 2015 WTA Wuhan Open Tennis Tournament in Wuhan, capital of central China's Hubei Province, on Sept. 29, 2015. Kerber won 2-1. (Xinhua/Xiao Yijiu)