Rafael Nadal wins Madrid Open title when Kei Nishikori retires

Rafael Nadal won his fourth Madrid Open title on Sunday after Kei Nishikori was forced to withdraw with an injury when trailing, 2-6, 6-4, 3-0, in the final. Nishikori's powerful groundstrokes helped him win the first set against the top-ranked Nadal, who couldn't find a way to counter his...

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