SHANGHAI, CHINA - OCTOBER 14: Novak Djokovic of Serbia shakes hands with Mischa Zverev of Germany during day six of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 14, 2016 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)
SHANGHAI, CHINA - OCTOBER 14: Novak Djokovic of Serbia shakes hands with Mischa Zverev of Germany during day six of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 14, 2016 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)