Rafa Nadal and Kei Nishikori Pose at Tibidabo Amusement Park [Getty Images]

BARCELONA, SPAIN - APRIL 18: Kei Nishikori attends the Photo Opportunity event ahead of the Barcelona Open Banc Sabadell, 64th Conde de Godo Trophy at the Tibidabo amusement park on April 18, 2016 in Barcelona, Spain. (Photo by Miquel Benitez/WireImage) — see more

BARCELONA, SPAIN - APRIL 18: Kei Nishikori attends the Photo Opportunity event ahead of the Barcelona Open Banc Sabadell, 64th Conde de Godo Trophy at the Tibidabo amusement park on April 18, 2016 in Barcelona, Spain. (Photo by Miquel Benitez/WireImage)

WireImage Miquel Benitez