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MELBOURNE, AUSTRALIA - JANUARY 31: Novak Djokovic of Serbia kisses the Norman Brookes Challenge Cup after winning the Men's Singles Final over Andy Murray of Great Britain during day 14 of the 2016 Australian Open at Melbourne Park on January 31, 2016 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 31:  Novak Djokovic of Serbia kisses the Norman Brookes Challenge Cup after winning the Men's Singles Final over Andy Murray of Great Britain during day 14 of the 2016 Australian Open at Melbourne Park on January 31, 2016 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)