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Roger Federer of Switzerland reacts 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/Ding Ting)
Roger Federer of Switzerland reacts 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/Ding Ting)