China's Peng Shuai returns the ball during the women's singles quarterfinal match against Ajla Tomljanovic of Croatia at the 2014 Tianjin Open tennis tournament in Tianjin, north China, on Oct. 10, 2014. Peng won 2-1. (Xinhua/Yue Yuewei)

Ajla Tomljanovic of Croatia returns the ball during the women's singles quarterfinal match against China's Peng Shuai at the 2014 Tianjin Open tennis tournament in Tianjin, north China, on Oct. 10, 2014. Ajla Tomljanovic lost 1-2. (Xinhua/Yue Yuewei)

Ajla Tomljanovic of Croatia returns the ball during the women's singles quarterfinal match against China's Peng Shuai at the 2014 Tianjin Open tennis tournament in Tianjin, north China, on Oct. 10, 2014. Ajla Tomljanovic lost 1-2. (Xinhua/Yue Yuewei)

China's Peng Shuai reacts during the women's singles quarterfinal match against Ajla Tomljanovic of Croatia at the 2014 Tianjin Open tennis tournament in Tianjin, north China, on Oct. 10, 2014. Peng won 2-1. (Xinhua/Yue Yuewei)

Ajla Tomljanovic of Croatia returns the ball during the women's singles quarterfinal match against China's Peng Shuai at the 2014 Tianjin Open tennis tournament in Tianjin, north China, on Oct. 10, 2014. Ajla Tomljanovic lost 1-2. (Xinhua/Yue Yuewei)