ROME, ITALY - MAY 14: Novak Djokovic of Serbia in action against Kei Nishikori of Japan during day seven of The Internazionali BNL d'Italia 2016 on May 14, 2016 in Rome, Italy. (Photo by Matthew Lewis/Getty Images)
ROME, ITALY - MAY 14: Novak Djokovic of Serbia in action against Kei Nishikori of Japan during day seven of The Internazionali BNL d'Italia 2016 on May 14, 2016 in Rome, Italy. (Photo by Matthew Lewis/Getty Images)