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Kei Nishikori from japan returns a ball while playing against Nick Kyrgios from Australia, during a Madrid Open tennis tournament match in Madrid, Spain, Friday, May 6, 2016. Nishikori won 7-6, 6-7 and 3-6 (Photo by Rodrigo Garcia/NurPhoto via Getty Images)

Kei Nishikori from japan returns a ball while playing against  Nick Kyrgios from Australia, during a Madrid Open tennis tournament match in Madrid, Spain, Friday, May 6, 2016. Nishikori won 7-6, 6-7 and 3-6 (Photo by Rodrigo Garcia/NurPhoto via Getty Images)