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SHANGHAI, CHINA - OCTOBER 13: Roger Federer of Switzerland returns a shot to Richard Gasquet of France on Day 6 during Men's Single Quater-Final of 2017 ATP 1000 Shanghai Rolex Masters on October 13, 2017 at Qizhong Stadium in Shanghai, China. (Photo by XIN LI/Getty Images)

SHANGHAI, CHINA - OCTOBER 13:  Roger Federer of Switzerland returns a shot to Richard Gasquet of France on Day 6 during Men's Single Quater-Final of 2017 ATP 1000 Shanghai Rolex Masters on October 13, 2017 at Qizhong Stadium in Shanghai, China.  (Photo by XIN LI/Getty Images)