SHANGHAI, CHINA - OCTOBER 05: Roger Federer of Switzerland practices with Marin Cilic of Croatia at the Rolex Shanghai Masters at the Qi Zhong Tennis Centre on October 05, 2019 in Shanghai, China. (Photo by TPN/Getty Images)
SHANGHAI, CHINA - OCTOBER 05: Roger Federer of Switzerland practices with Marin Cilic of Croatia at the Rolex Shanghai Masters at the Qi Zhong Tennis Centre on October 05, 2019 in Shanghai, China. (Photo by TPN/Getty Images)