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MELBOURNE, AUSTRALIA - JANUARY 27: Novak Djokovic of Serbia celebrates winning a point in his quarterfinal match against Andy Roddick of the United States of America during day nine of the 2009 Australian Open at Melbourne Park on January 27, 2009 in Melbourne, Australia. (Photo by Ezra Shaw/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 27:  Novak Djokovic of Serbia celebrates winning a point in his quarterfinal match against Andy Roddick of the United States of America during day nine of the 2009 Australian Open at Melbourne Park on January 27, 2009 in Melbourne, Australia.  (Photo by Ezra Shaw/Getty Images)