KEY BISCAYNE, FL - MARCH 26: Kei Nishikori of Japan is congratulated by Roger Federer after their match during the Sony Open at the Crandon Park Tennis Center on March 26, 2014 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)
KEY BISCAYNE, FL - MARCH 26: Kei Nishikori of Japan is congratulated by Roger Federer after their match during the Sony Open at the Crandon Park Tennis Center on March 26, 2014 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)