Things that will happen before Smith gets outpublished at 09:35 GMT 16 December 2017
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Lewis Starks: The next Ashes series!
Richard Lendon: Father Christmas will appear in person.
Dave Bookham: Jose Mourhino playing expansive football.
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
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Lewis Starks: The next Ashes series!
Richard Lendon: Father Christmas will appear in person.
Dave Bookham: Jose Mourhino playing expansive football.
Dan Norcross
BBC Test Match Special
This has been an epically disastrous day.
Smith 220, M Marsh 179
I've had the fortune to commentate on some fairly remarkable sporting moments in the past six years. Mitch Marsh carting England for 179 in a partnership of 291 is up there.
When he came out to bat someone on the TV said he was the worst number six in the history of Australian cricket...
Text 81111
If this was our social five-a-side football game we would stop and swap players. "Joe and Moeen you go on theirs, Steve and Nathan you come on ours."
James , Newton le willows
Smith 220, M Marsh 179
BT Sport are just going through the day's wickets for those of you who are just waking up.
Done.
Text 81111
Retired
Dean, Essex
Superannuated
Martin in Preston
Pusillanimous
Anonymous
Lead by 133
We've all seen some hammerings down under down the years. The worst thing about this display is that (whisper it) I'm not sure that this Australia XI is even that good.
Compared to the 90s anyway.
It's a good job we got rid of timeless Tests. These two would still be batting when the County Championship starts up again in April.
Text 81111
England in one word - But I'm not allowed to swear on the BBC...?
Jack, London
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Christopher Toth: England's attack is like trying to eat soup with a fork ...don't have the tools for the job. Sinking feeling.
Ed Smith
Ex-England batsman on BBC Test Match Special
Malan the danger man!
Smith 218, M Marsh 176
DM - Danger Man Dawid Malan!
Get him opening the bowling next time. He induces a first false shot from Steve Smith for about 75 overs as the Aussie captain clips a leading edge back towards Malan.
It just doesn't quite carry.
Smith 217, M Marsh 175
Stuart Broad is 0-112 from 28 overs. There are seven overs left in the day, can Mitch get his 200 in a day?
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Josh Metcalfe: Sunderland win a home game
Dry your eyes Craig, I know it's hard to take but Steve Smith's mind has been made up.There's plenty more runs in this pitch...
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Craig Morrison: Wake up. Turn on @bbctms. Malan bowling. Conclude England must be very confident to play him and so on top. Wake up properly. Engage brain. Worry. Hear score. Cry.
Steve Smith has gone past his previous best Test score of 215 at Lord's...
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Elliott Binks: Hey BBC Sport - my wicket notifications for The Ashes don’t seem to be working. For some reason I only got one all night, and that was 6 hours ago. Sort it out.
Ed Smith
Ex-England batsman on BBC Test Match Special
I'm not sure Steve Smith is going to be slogging...
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
Why wasn't Malan bowling before? This is what you want, somebody who tosses it up and gets them slogging.