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TORONTO, ON- JULY 28 - Frenchman Gael Monfils returns a shot at the Rogers Cup ATP 1000 tournament at the Aviva Centre in Toronto. July 28, 2016. (Steve Russell/Toronto Star via Getty Images)

TORONTO, ON- JULY 28  - Frenchman Gael Monfils returns a shot at the Rogers Cup ATP 1000 tournament  at the Aviva Centre in Toronto. July 28, 2016.        (Steve Russell/Toronto Star via Getty Images)