Postpublished at 02:46 Greenwich Mean Time 6 January 2018
Joe Root is coming into the attack...
S Marsh 98*, M Marsh 63*
Khawaja 171 - Crane's first Test wicket
England take two wickets in day
M Marsh overturns lbw on 55
Khawaja adds 188 with Smith (83)
Day five starts at 23:30 GMT
Australia lead five-match series 3-0
Jack Skelton and Amy Lofthouse
Joe Root is coming into the attack...
Vic Marks
Ex-England spinner on BBC Test Match Special
Now Steve Smith's out there's a tension out there - a feeling that we could get a couple of wickets in quick succession. I don't think England can afford to give away a lead much beyond 50 or 60. They'll do well to get that, though.
Trail by 50
A streaky cut shot from Khawaja off Moeen flies past Joe Root at first slip and sees him run another two.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
Mason Crane is getting close to that line at times. He's back and forth around it.
Khawaja 140, S Marsh 11
Mason Crane checks in his run up once more, goes again and gets a big spinner from wide that Usman Khawaja has to go back and defend.
He then attacks a short one but can't find the fence, picking out the man in the deep for one.
Crane comes back over the wicket to Marsh - and again opts out of his run up, to some unnecessary boos from the SCG crowd.
He does let go next up and Marsh flicks it away for one, before Khawaja dinks into off for another. Marsh goes down the track to the last, drives it into the ground, with Crane parrying it to Stuart Broad at mid-on.
Moeen continues round the wicket to the left-handed Marsh, who has to be wary of the spin away from him off a length. The Aussie number five covers up and defends - another maiden for Moeen. Can he make this pressure tell?
Trail by 55
Shaun Marsh dances down to turn a full ball from Crane into a low full toss, flicking it through mid-on for one.
Crane drops short and Khawaja swivels on the pull but can only pick up one thanks to some decent work in the deep by Dawid Malan before Marsh takes another off the last.
Stephan Shemilt
BBC Sport in Sydney
The statues at the SCG are great, but could they not have had Stan McCabe playing a better shot? He looks like Stuart Broad dealing with a Pat Cummins bouncer.
More neat stuff from Moeen, good lines and lengths and preventing Khawaja from working anything away. That's another maiden.
#bbccricket
Out of ideas: Playing two spinners is starting to look like a wise move. Lyon is going to be a handful though when England bat again.
Trail by 58
Ooft. Crane hangs it out wide, Khawaja chases with the cut shot and is lucky not to edge it behind to Bairstow.
That is too short from Crane next and Khawaja swivels it away to deep mid-wicket for one, the first time the batsmen have rotated since lunch.
Marsh goes to sweep one down leg but misses out, with Bairstow covering well to prevent a bye. Crane then dives to his left and saves a flick down the ground.
#bbccricket
Wise decision not to review that one - it was straightening enough to carry on wide of the stumps, despite Shaun Marsh offering no shot.
Good stuff from Moeen, keeping it tight and sending down another maiden.
Dan Norcross
BBC Test Match Special
It was a quicker ball - it really flew through.
Shaun Marsh shoulders arms up to a quicker ball from Moeen Ali that came on and into the pads.
A big shout but given not-out...and England decide against the review, with Moeen shaking his head.
Dan Norcross
BBC Test Match Special
That was a bit of a Marcus Trescothick shot.
Khawaja 136, S Marsh 8
Khawaja ends a long run of dot balls with a tremendous thwack over mid-wicket for a one-bounce four. A bit full from Crane but it was all about the shot.
Good response from Crane, forcing the centurion to defend a few dot balls.
Lovely bit of turn and bounce from Moeen as he gets it past the outside edge of Marsh's defensive prod.
Good pressure from England - that's back-to-back maidens.
tms@bbc.co.uk
Here's a radical idea: only award a series win when the two teams have played each other home AND away... That way, the idiosyncrasies of weather conditions, pitches and cricket balls are evened out. Simples!
Richard Ross
Here's Mason Crane on for his first over after lunch and the no-ball kerfuffle.
Tidy start, Khawaja unable to work anything away on the sweep.
The number three then chips a bat-pad into the off side but there is no fielder close enough to catch it. A maiden for Mason.