In the aftermath of his triumph in the longest grand slam final in history and the longest ever Australian Open match, men's singles champion and standout world No.1 Novak Djokovic took the time to quietly savour his victory with his entourage. The three-time Australian Open champion confirmed today that the adrenalin was still buzzing in the early hours of the morning for him to summon the energy to belt out a song in a cameo performance at the post-tournament staff party.