MADRID, SPAIN - MAY 11: Kei Nishikori of Japan in action against David Ferrer of Spain during day six of the Mutua Madrid Open tennis at La Caja Magica on May 11, 2017 in Madrid, Spain. (Photo by Julian Finney/Getty Images)
MADRID, SPAIN - MAY 11: Kei Nishikori of Japan in action against David Ferrer of Spain during day six of the Mutua Madrid Open tennis at La Caja Magica on May 11, 2017 in Madrid, Spain. (Photo by Julian Finney/Getty Images)