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MELBOURNE, AUSTRALIA - FEBRUARY 01: Novak Djokovic of Serbia poses for photographers with the Norman Brookes Challenge Cup after winning his men's final match against Andy Murray of Great Britain during day 14 of the 2015 Australian Open at Melbourne Park on February 1, 2015 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - FEBRUARY 01:  Novak Djokovic of Serbia poses for photographers with the Norman Brookes Challenge Cup after winning his men's final match against Andy Murray of Great Britain during day 14 of the 2015 Australian Open at Melbourne Park on February 1, 2015 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)