Aus 501-4published at 137.2 overs
The partnership breaker! England turn to Dawid Malan, who must be delighted to be asked for some part-time spin against two batsmen who have scored 362 between them...
Smith 229*, M Marsh 181*
Fifth-wicket stand worth 301
Marsh's maiden Test century
England take only one wicket in day
Australia lead 2-0 in five-match series
Play starts at 02:30 GMT on Sunday
Tom Rostance, Amy Lofthouse and Mandeep Sanghera
The partnership breaker! England turn to Dawid Malan, who must be delighted to be asked for some part-time spin against two batsmen who have scored 362 between them...
Are you allowed to bat sitting down?
Stephan Shemilt
BBC Sport in Perth
I'm told that the adjustment Smith is making to his laces is a superstition. He tapes them to his trousers so he can't see them when he looks down. Honest.
Glenn McGrath
Ex-Australia pace bowler on BBC Test Match Special
Smith does have a few issues with his lower back.
We have a chair on the pitch! Steve Smith is having a bit of treatment.
He deserves a sit down, he's been batting for 498 minutes (FOUR HUNDRED AND NINETY-EIGHT!)
Jonathan Agnew
BBC cricket correspondent
Feel like I’ve well and truly joined the club today. Turn on @bbctms, external: immediate sinking feeling. There’s something about the subdued tone of the voices (except @jimmaxcricket, external obviously) Pea shooters v cannons. Classy batting too, of course.
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Smith 207, M Marsh 154
The barmy army are still singing, and still drinking. It's medicinal by this stage. The 500 comes up as Steve Smith slaps Jimmy Anderson square.
I wouldn't say it's been an uneventful day in the field but James Vince stops one at point and I'm pretty sure that's the first mention of his name since he was out.
Australia lead by 97.
Text 81111
Sad.
Steve, Kent
Underwhelming.
George, Leeds
Spineless.
Mayur Rao, Leicester
Smith 205, M Marsh 154
Mitch Marsh carts Moeen to the fence once more, that brings up the 250 partnership. As recall decisions go, Mitch Marsh is up there. Played, selectors.
Chance! Marsh is looking to up the rate now and hits a caught and bowled chance back towards the spinner - it didn't carry.
Glenn McGrath
Ex-Australia pace bowler on BBC Test Match Special
If you're a batsman and you're having a bad day, it's over in one ball. If you're a bowler and you're having a bad day, it goes on...
Text 81111
Amateur.
Chris, Fife
Predictable.
Ian Merry
Students.
Aaron the Aussie, Reading
Lead by 91
Five and a bit hours since our only wicket of the day. I'm stitching him up a bit here but here's a reminder of how the great Geoffrey Boycott greeted Mitch Marsh (150*) to the crease...
Text 81111
I heard that there is some community sports programme happening in Perth where Australians are teaching some English lads how to play cricket.
James B, North Walsham
Glenn McGrath
Ex-Australia pace bowler on BBC Test Match Special
I can't see them declaring tonight.
Smith 205, M Marsh 150
Speculation in the TMS box is that Mitch Marsh may overtake Steve Smith before too long. Not bad considering Smith was on 116 when Marsh came in...
Ed Smith
Ex-England batsman on BBC Test Match Special
England have looked very flat and defeated all day.
Text 81111
Typical.
Alex Maynard
Demoralising.
Soumen, London
England want to change the ball but Marais Erasmus tells them to get on with it. I don't think the ball makes much difference at this stage.
Steve Smith is 10 runs away from his own personal best score...
#bbccricket
Giaus: This series has been a disgrace from England's point of view. The gap between the teams isn't that big but the senior players are not making good decisions while batting and going missing in the field.