Without an Australian Open title in three finals, Andy Murray said he should not be expected to beat Novak Djokovic in the 2015 final.
Andy Murray played the underdog card ahead of his match-up with Novak Djokovic in the Australian Open final.
Murray lost the decider at Melbourne Park to Djokovic in 2011 and '13, and was runner-up to Roger Federer in '10 - but is embarking on redemption in final number four on Sunday.
The Brit has won two majors from seven finals, but he said he should not be expected to break his drought against Djokovic - who has won their previous seven hard-court encounters, and their past four overall.
"I know if I want to win, it will probably be very, very tough and challenging physically," the Scotsman said.
"So I need to prepare myself mentally for that. But he [Djokovic] has a fantastic record here. He obviously loves the court and the conditions.
"And it would be a big upset if I manage to win tomorrow."
He added: "Well, I've never won against him here before. I've lost to him each time that we've played [in Melbourne].
"I think I've lost to him the last four or five times we played against each other, as well.
"Maybe only won one set in those matches. Yeah it would be a big turnaround.
"I played him a couple times very close the end of last year and lost pretty comfortably.
"For me it would be a big turnaround in a few months if I was able to win.
"I'm not saying it's not a possibility, but it's going to be very, very tough."