Del Potro, Djokovic in US Open final as Nadal quits with knee injury

New York Juan Martin del Potro set up a US Open final clash against Novak Djokovic on Friday after defending champion and world number one Rafael Nadal quit his last-four clash against the giant Argentine with a knee injury. Third seed Del Potro, the champion in 2009, was 7-6 (7/3), 6-2 ahead when Nadal retired.
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