Novak Djokovic is remaining upbeat despite admitting he was not at his best during his win over Stan Wawrinka in the Australian Open semi-finals.

The world number one ran out a 7-6 (7-1) 3-6 6-4 4-6 6-0 winner on Rod Laver Arena on Friday.

But the clash largely failed to live up to expectations as Djokovic and Wawrinka made 118 unforced errors between them in the three-and-a-half hour match.

Djokovic said his performance was below where he wanted it to be, but insisted he had plenty of positives to take into Sunday's final against Andy Murray.

"I think I have much more positive things to reflect on in my game and then all the matches that I played so far in the tournament than the negative," he said.

"I'm in the finals. In the end of the day, that's why I'm here, you know, to try to get far in the tournament.

"Getting to the finals in any way possible is a great achievement. I'm going to try to use that for build up of the confidence for finals."

Djokovic was proud of his fight during the five-setter, with an 11-minute hold of serve in the opening game of the decider crucial.

"I can say I'm glad, of course I'm happy and satisfied to go through," he said.

"I'm proud of the fighting spirit that I had. But the level of performance was not where I wanted it to be."

Asked about his fitness after some long baseline exchanges against Wawrinka, Djokovic said he had no concerns.

"It was more mental in a way because once you back up and start playing defensively you spend a lot of energy," he said.

"He was the one that was dictating the rallies. There's no question about it.

"Some points of the match I did struggle physically to recover for the next one because I run a lot and he was getting a lot of balls back in play.

"I didn't have many free points on the first serve as I did throughout the tournament, so that was a significant change.

"But, you know, nothing that will worry me. I'm sure that I'll be fit and ready for finals."