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SHANGHAI, CHINA - OCTOBER 15: Kei Nishikori returns a shot against Kevin Anderson of Republic of South Africa during their men's singles third round on day 5 of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 15, 2015 in Shanghai, China. (Photo by Kevin Lee/Getty Images)

SHANGHAI, CHINA - OCTOBER 15:  Kei Nishikori returns a shot against Kevin Anderson of Republic of South Africa  during their men's singles third round on day 5 of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 15, 2015 in Shanghai, China.  (Photo by Kevin Lee/Getty Images)