Zhang Shuai of China competes during a training session of tennis in Rio de Janeiro, Brazil, on Aug. 3, 2016. (Xinhua/Liu Jie)

Zheng Saisai of China competes during a training session of tennis in Rio de Janeiro, Brazil, on Aug. 3, 2016. (Xinhua/Liu Jie)

Peng Shuai of China (R) greets her teammate Zhang Shuai during a training session of tennis in Rio de Janeiro, Brazil, on Aug. 3, 2016. (Xinhua/Liu Jie)

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