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Switzerland's Roger Federer hits a return 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 hits a return 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)