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