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Daria Kasatkina of Russia returns the ball during the women's singles third round match against Agnieszka Radwanska of Poland at 2017 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2017. (Xinhua/Meng Yongmin)

Daria Kasatkina of Russia returns the ball during the women's singles third round match against Agnieszka Radwanska of Poland at 2017 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2017. (Xinhua/Meng Yongmin)