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Jared Donaldson of the United States hits a return during the second round match against Spain's Rafael Nadal at 2017 ATP Shanghai Rolex Masters in Shanghai, east China, Oct. 11, 2017. (Xinhua/Fan Jun)

Jared Donaldson of the United States hits a return during the second round match against Spain's Rafael Nadal at 2017 ATP Shanghai Rolex Masters in Shanghai, east China, Oct. 11, 2017. (Xinhua/Fan Jun)