I'm not invincible, says Djokovic

Novak Djokovic, whose US Open triumph was his third Grand Slam title of the season and 64th win in 66 matches in 2011, insisted on Monday that he was not invincible.

"I am not invincible," said Djokovic. "I think a positive attitude keeps you on top of your game, when you go on court and when I had the start to the year that I had. Of course I want to win more majors and prove things to myself."

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