CANADA - AUGUST 13:  Novak Djokovic wins Rodgers Cup in Montreal, Canada on August 12th, 2007 - The Serbian Novak Djokovic completed an incredible table of hunting, on Sunday, beating the Switzerland and the World No - 1 Roger Federer in the final of the Rogers Cup in Montrea  (Photo by Pedro RUIZ/Gamma-Rapho via Getty Images)
MONTREAL, QC - AUGUST 14:  Novak Djokovic of Serbia poses for photographers after defeating Mardy Fish of the United States in the final of the Rogers Cup at Uniprix Stadium on August 14, 2011 in Montreal, Quebec, Canada.  (Photo by Matthew Stockman/Getty Images)
TORONTO, ON - AUGUST 12:  Novak Djokovic of Serbia holds the winner's trophy after beating Richard Gasquet of France 6-3,6-2 in finals of the Rogers Cup Presented By National Bank at Rexall Centre at York University on August 12, 2012 in Toronto, Ontario, Canada.  (Photo by Andy Lyons/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)