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MELBOURNE, AUSTRALIA - JANUARY 27: Novak Djokovic of Serbia (right) receives the Norman Brookes Challenge Cup from Andre Agassi after winning his men's final match against Andy Murray of Great Britain during day fourteen of the 2013 Australian Open at Melbourne Park on January 27, 2013 in Melbourne, Australia. (Photo by Tommy Hindley/Professional Sport/Popperfoto via Getty Images/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 27: Novak Djokovic of Serbia (right) receives the Norman Brookes Challenge Cup from Andre Agassi after winning his men's final match against Andy Murray of Great Britain during day fourteen of the 2013 Australian Open at Melbourne Park on January 27, 2013 in Melbourne, Australia. (Photo by Tommy Hindley/Professional Sport/Popperfoto via Getty Images/Getty Images)