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TORONTO, ON - JULY 31: Novak Djokovic (R) of Serbia with the winners trophy and Kei Nishikori (L) of Japan with the runners-up trophy following 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 with the winners trophy and Kei Nishikori (L) of Japan with the runners-up trophy following 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)