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Juan Martin del Potro of Argentina reacts during the men's singles second round match against Grigor Dimitrov of Bulgaria at 2017 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2017. (Xinhua/Meng Yongmin)

Juan Martin del Potro of Argentina reacts during the men's singles second round match against Grigor Dimitrov of Bulgaria at 2017 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2017. (Xinhua/Meng Yongmin)