Roger Federer of Switzerland hits a return during the singles final match against Rafael Nadal of Spain at 2017 ATP Shanghai Masters tennis tournament in Shanghai on Oct. 15, 2017. (Photo/Xinhua)
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Roger Federer of Switzerland hits a return during the singles final match against Rafael Nadal of Spain at 2017 ATP Shanghai Masters tennis tournament in Shanghai on Oct. 15, 2017. (Photo/Xinhua)
