MELBOURNE: World number one Novak Djokovic won a fifth Australian Open title and his eighth Grand Slam Sunday, grinding down Britain's Andy Murray in four sets to heap more misery on the Scot.

Djokovic won 7-6 (7/5), 6-7 (4/7), 6-3, 6-0 in 3hr 39min to stretch his formidable record on the Melbourne hardcourts to winning five from five finals in eight years.

Only Australian Roy Emerson, who was in the crowd and handed him the trophy, has won more Australian Opens with six in the 1960s.

"I am so privileged and honoured and grateful to be standing here as a champion for the fifth time and to be in the elite group of players with Sir Roy Emerson and Rod Laver and all the legends of our sport," said the Serb.

"It's an honour playing in front of you, thank you very much."