PARIS, FRANCE - NOVEMBER 01:  Novak Djokovic of Serbia in action against against Kei Nishikori of Japan in their semi final match during day 6 of the BNP Paribas Masters held at the at Palais Omnisports de Bercy on November 1, 2014 in Paris, France.  (Photo by Dean Mouhtaropoulos/Getty Images)