Spanish player Rafael Nadal (R) and Spain's Queen Sofia look at the trophy after the men's singles final tennis match of the Madrid Masters at the Magic Box (Caja Magica) sports complex in Madrid on May 11, 2014. Rafael Nadal 2-6, 6-4, 3-0. Rafael Nadal won his fourth title at the Madrid Masters, 2-6, 6-4, 3-0 when Kei Nishikori retired with a lower back injury.  AFP PHOTO / PIERRE-PHILIPPE MARCOU        (Photo credit should read PIERRE-PHILIPPE MARCOU/AFP/Getty Images)