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MADRID, SPAIN - MAY 06: Kei Nishikori of Japan shakes hands at the net after his three set victory against Nick Kyrgios of Australia in their quarter final round match during day seven of the Mutua Madrid Open tennis tournament at the Caja Magica on May 06, 2016 in Madrid,Spain. (Photo by Clive Brunskill/Getty Images)

MADRID, SPAIN - MAY 06:  Kei Nishikori of Japan shakes hands at the net after his three set victory against Nick Kyrgios of Australia in their quarter final round match during day seven of the Mutua Madrid Open tennis tournament at the Caja Magica  on May 06, 2016 in Madrid,Spain.  (Photo by Clive Brunskill/Getty Images)