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BARCELONA, SPAIN - APRIL 20: (L-R) Japanese tennis player Kei Nishikori and Spanish tennis player Rafael Nadal pose for a photo at the Sant Pau Hospital in Barcelona during day one of the ATP 63th Barcelona Open Banc Sabadell on April 20, 2015 in Barcelona, Spain. (Photo by Miquel Benitez/Getty Images)

BARCELONA, SPAIN - APRIL 20:  (L-R) Japanese tennis player Kei Nishikori and Spanish tennis player Rafael Nadal pose for a photo at the Sant Pau Hospital in Barcelona during day one of the ATP 63th Barcelona Open Banc Sabadell on April 20, 2015 in Barcelona, Spain.  (Photo by Miquel Benitez/Getty Images)