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Japanese tennis player Kei Nishikori returns the ball to Spanish tennis player Roberto Bautista Agut during the ATP Barcelona Open "Conde de Godo" tennis tournament in Barcelona on April 24, 2015. AFP PHOTO / JOSEP LAGO (Photo credit should read JOSEP LAGO/AFP/Getty Images)

Japanese tennis player Kei Nishikori returns the ball to Spanish tennis player Roberto Bautista Agut during the ATP Barcelona Open "Conde de Godo" tennis tournament in Barcelona on April 24, 2015.   AFP PHOTO / JOSEP LAGO        (Photo credit should read JOSEP LAGO/AFP/Getty Images)