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Switzerland's Roger Federer reacts during the men's singles second round match against Argentina's Diego Schwartzman at 2017 ATP Shanghai Rolex Masters in Shanghai, east China, Oct. 11, 2017. (Xinhua/Fan Jun)

Switzerland's Roger Federer reacts during the men's singles second round match against Argentina's Diego Schwartzman at 2017 ATP Shanghai Rolex Masters in Shanghai, east China, Oct. 11, 2017. (Xinhua/Fan Jun)