TORONTO, ON - JULY 31: Novak Djokovic of Serbia celebrates winning the Singles Final over Kei Nishikori of Japan during Day 7 of the Rogers Cup at the Aviva Centre on July 31, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)
TORONTO, ON - JULY 31: Novak Djokovic of Serbia celebrates winning the Singles Final over Kei Nishikori of Japan during Day 7 of the Rogers Cup at the Aviva Centre on July 31, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)