MADRID, SPAIN - MAY 11:  Kei Nishikori of Japan is applauded by Queen Sofia of Spain as he holds his runner up trophy after retiring injured in the third set against Rafael Nadal of Spain in their final match during day nine of the Mutua Madrid Open tennis tournament at the Caja Magica on May 11, 2014 in Madrid, Spain.  (Photo by Clive Brunskill/Getty Images)