Djokovic of Serbia signs autographs after defeating Wawrinka of Switzerland in their men's singles match at the U.S. Open tennis tournament in New York

Novak Djokovic signs autographs after defeating Stanislas Wawrinka of Switzerland.

( Eduardo Munoz / Reuters / September 5, 2012 )

Novak Djokovic signs autographs after defeating Stanislas Wawrinka of Switzerland.

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