
Daria Kasatkina of Russia hits a return during the women's singles first round match against Wang Qiang of China at the 2017 US Open tennis tournament in New York, the United States, Aug. 30, 2017. (Xinhua/Wang Ying)

Daria Kasatkina of Russia hits a return during the women's singles first round match against Wang Qiang of China at the 2017 US Open tennis tournament in New York, the United States, Aug. 30, 2017. (Xinhua/Wang Ying)