MONTREAL, ON - AUGUST 15:  Kei Nishikori of Japan walks off the court after his loss to Andy Murray of Great Britain during day six of the Rogers Cup at Uniprix Stadium on August 15, 2015 in Montreal, Quebec, Canada.  Andy Murray defeated Kei Nishikori 6-3, 6-0. (Photo by Minas Panagiotakis/Getty Images)