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

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