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Kei Nishikori of Japan in his match against Roberto Bautista Agut of Spain during day six of the Mutua Madrid Open tennis tournament at the Caja Magica on May 7, 2015 in Madrid, Spain. Photo: Oscar Gonzalez/NurPhoto (Photo by Oscar Gonzalez/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)

Kei Nishikori of Japan in his match against Roberto Bautista Agut of Spain during day six of the Mutua Madrid Open tennis tournament at the Caja Magica on May 7, 2015 in Madrid, Spain. Photo: Oscar Gonzalez/NurPhoto (Photo by Oscar Gonzalez/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)