TORONTO, ON - JULY 30: Novak Djokovic of Serbia serves against Gael Monfils of France during Day 6 of the Rogers Cup at the Aviva Centre on July 30, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)
TORONTO, ON - JULY 30: Novak Djokovic of Serbia serves against Gael Monfils of France during Day 6 of the Rogers Cup at the Aviva Centre on July 30, 2016 in Toronto, Ontario, Canada. (Photo by Vaughn Ridley/Getty Images)