By Jon Wertheim
September 09, 2013
Rafael Nadal celebrates after beating Novak Djokovic to win his second U.S. Open title.
Al Bello/Getty Images

Thirteen Grand Slams for a guy who is 27 years old is incredible," said Djokovic, a six-time major winner. "Whatever he achieved so far in his career is something that everybody should respect, no question about it. He's definitely one of the best tennis players ever to play the game."

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