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Karen Khachanov of Russia returns the ball during the men's singles semifinal match against Dominic Thiem of Austria at 2019 China Open tennis tournament in Beijing, capital of China, Oct. 5, 2019. (Xinhua/Ren Chao)
Karen Khachanov of Russia returns the ball during the men's singles semifinal match against Dominic Thiem of Austria at 2019 China Open tennis tournament in Beijing, capital of China, Oct. 5, 2019. (Xinhua/Ren Chao)