Nadal goes back to back in Madrid via Nishikori retirement
Kei Nishikori was two games away from capturing the biggest title of his career before back and hip problems that plagued him throughout the tournament flared up and eventually forced him to retire from the Mutua Madrid Open final against Rafael Nadal on Sunday evening. Nadal had battled back for a 2-6, 6-4, 3-0 lead when Nishikori called it quits after one hour and 42 minutes. […]