TORONTO, ON - JULY 31: Novak Djokovic of Serbia hits a shot against Kei Nishikori of Japan in the Singles Final 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: Kei Nishikori of Japan hits a shot against Novak Djokovic of Serbia in the Singles Final 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 hits a shot against Kei Nishikori of Japan in the Singles Final 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: Kei Nishikori of Japan hits a shot against Novak Djokovic of Serbia in the Singles Final 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 (R) of Serbia is congratulated by Kei Nishikori (L) of Japan after winning the Singles Final 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)
