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

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