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Roger Federer of Switzerland hits a return during the singles third round match against Alexandr Dolgopolov of Ukraine at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 12, 2017. (Xinhua/Fan Jun)
Roger Federer of Switzerland hits a return during the singles third round match against Alexandr Dolgopolov of Ukraine at 2017 ATP Shanghai Masters tennis tournament in Shanghai, east China, on Oct. 12, 2017. (Xinhua/Fan Jun)