MONTREAL, ON - AUGUST 14: Rafael Nadal of Spain prepares to serve against Kei Nishikori of Japan during day five of the Rogers Cup at Uniprix Stadium on August 14, 2015 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)
MONTREAL, ON - AUGUST 14: Rafael Nadal of Spain prepares to serve against Kei Nishikori of Japan during day five of the Rogers Cup at Uniprix Stadium on August 14, 2015 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)