(NEW YORK) -- Rafael Nadal improved his record to 16-0 on hard courts this season by defeating American Ryan Harrison 6-4, 6-2, 6-2 in the first round of the US Open Sunday."It's difficult to analyze now," the second-seeded Nadal said, when asked if this is the best he has ever played on hard-courts. "I am playing well. Happy the way I was playing. I don't know if it was the best or not, but it was very good because I was able to win."
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