Melbourne: Novak Djokovic feels in the prime of his career with more Grand Slams beckoning after winning a gripping Australian Open final in which he overcame "a physical crisis".

The Serb ironman showed why he remains the world number one with an energy-sapping 7-6 (7/5), 6-7 (4/7), 6-3, 6-0 win over sixth seed Andy Murray on Sunday evening. He has now won all five of his Melbourne Park finals and said it was perhaps the most satisfying of his eight Grand Slam titles.