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MADIRD, SPAIN - MAY 7 Novak Djokovic of Serbia celebrates victory against Kei Nishikori of Japan during day eight of the Mutua Madrid Open tennis tournament at the Caja Magica in Madrid on May 7, 2016. (Photo by Burak Akbulut/Anadolu Agency/Getty Images)

MADIRD, SPAIN - MAY 7 Novak Djokovic of Serbia celebrates victory against Kei Nishikori of Japan during day eight of the Mutua Madrid Open tennis tournament at the Caja Magica in Madrid on May 7, 2016. (Photo by Burak Akbulut/Anadolu Agency/Getty Images)