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MADRID, SPAIN - MAY 07: Kei Nishikori of Japan celebrates a point against Novak Djokovic of Serbia in their semi final match during day eight of the Mutua Madrid Open tennis tournament at the Caja Magica on May 07, 2016 in Madrid,Spain. (Photo by Clive Brunskill/Getty Images)

MADRID, SPAIN - MAY 07:  Kei Nishikori of Japan celebrates a point against  Novak Djokovic of Serbia in their semi final match during day eight of the Mutua Madrid Open tennis tournament at the Caja Magica  on May 07, 2016 in Madrid,Spain.  (Photo by Clive Brunskill/Getty Images)