All-rounder Shane Watson claims Australia haven't quite got their hands on the Ashes urn yet despite closing in on victory in Perth.
Watson smashed 103 and then claimed the wicket of Michael Carberry as Australia left England with a mountain to climb to avoid a third successive defeat.
The tourists finished day four on 251-5 and must either reach a Test record 504 for victory or bat out the final three sessions if they are to keep the urn out of Australia's grasp for now.
Ben Stokes, who is on 72 not out, and Matt Prior (7no) will return to the crease on Tuesday - and Watson knows Australia can take nothing for granted.
"We still have a bit of work to do," Watson told Sky Sports.
"The English guys batted nicely this afternoon, especially Stokesy who batted beautifully, so we have a fair amount of hard work to do in the morning.
"There is no doubt a nice night's sleep to freshen up will play into our hands to give it a good crack."
Victory will move hosts into an unassailable 3-0 lead and see the Ashes back in Australia's hands.
And Watson has praised Australia's bowling attack for putting them in such a commanding position during the series.
"We have some world-class bowlers going at it," he said.
"The ball from Ryan Harris to get Alastair Cook out was a pretty amazing ball. Swinging in and seaming away is going to get any batsman out.
"Mitch Johnson has been absolutely world-class. To see the pace and quality of bowling he has had and sustained through every Test match, it is very special to have him on our side rather than facing him.
"And Peter Siddle then complements our attack so well. He has bowled very well against England for a number of series now.
"We complement each other and we are able to sustain pressure for a long period of time and that is the best way of giving yourself a chance of knocking over these high quality English batsmen."