Australia captain Ricky Ponting said his team would head into uncharted territory against England at The Oval next month, needing a win to draw a series.
Ponting, speaking after England won the fourth Test at Trent Bridge by three wickets to go 2-1 up with one match to play, also said he was not sure whether his leading fast bowler Glenn McGrath would be fit for the final Test.
"We've probably never been in this situation before," he told a news conference. "I can't remember that for a long time. But it might not be a bad thing for us right now, to tell the truth, just to go out there and play instinctively and play the brand of cricket we've played for a long time.
"It's almost like a little bit of the pressure is off. We can just go out there and play and if all the individuals just lift a little bit and play the way I know that they can, then I am sure and I know the result will be different."
Australia have won the last eight Ashes series dating back to 1989.
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England won by two runs at Edgbaston, were held to a draw at Old Trafford needing one wicket for victory, and edged home at Trent Bridge when only needing 129 in their second innings.
"As I have seen over the last two days of this game, a lot of that fight is there but just not for long enough," Ponting said. "If we want to win Test matches, it has to be over four days."
Ponting is unsure about McGrath's fitness.
"We still have to look at how Glenn is going to come up," he said. "I am not sure how he is right now or if he's going to be fit."
McGrath was the man of the match in the first Test, passing 500 Test wickets on the way, but missed the second with damaged ankle ligaments.
He was patched up for the third Test, then missed Trent Bridge with a swollen right elbow.
England also have injury concerns over fast bowler Simon Jones. He missed most of Australia's second innings after hurting his right ankle.
An England statement said he would have further treatment right up to the fifth Test starting on September 8.
