Postpublished at 05:36 Greenwich Mean Time 5 January 2018
Dan Norcross
BBC Test Match Special
That did bounce in front of Joe Root.
Warner 56, Khawaja 91*, Smith 44*
Smith rides luck in stand of 107*
Eng 346: Root 83, Malan 62, Curran 39
Cummins 4-80, Hazlewood 2-65
Day three starts at 23:30 GMT
Australia lead 3-0 in five-Test series
Amy Lofthouse, Jack Skelton and Saj Chowdhury
Dan Norcross
BBC Test Match Special
That did bounce in front of Joe Root.
A reverse sweep from Usamn Khawaja! He doesn't control it either and he's lucky that Tom Curran is quite deep on the boundary.
And now it's Steve Smith that offers up half a chance! He pushes forward, the ball takes the outside edge and it drops just short of a tumbling Joe Root at slip.
#bbccricket
JillyCL: Gotta get Smith's wicket before stumps today!
England 346
Smith shows us his pirouette of a leave before ducking one of two bouncers in the over. The Australia captain can't be tempted.
Broad's first ball is 78mph. Smith has time to brush his teeth and do his hair before he blocks it.
We have a change of bowling. Stuart Broad, on 399 Test wickets, is back on.
Stephan Shemilt
BBC Sport in Sydney
The cricket acting as a warm-up act before the band comes on later.
Simon Mann
BBC Test Match Special commentator
That full toss was predictable as Mason Crane completely lost his rhythm there.
An edge, but it's short! Usman Khawaja stays deep in his crease and pushes tamely forward at Mason Crane, but the ball bounces over Jonny Bairstow's knee and just past Joe Root, who can only grope at fresh air.
Crane follows it up with two false run-ups, keeping the ball in his hand, and then loses all his rhythm, sending down a rank full toss that Steve Smith creams to the boundary.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
We must find a frontline spinner. That might mean starting with a young kid, if you think he's got the character.
You have to grow into it, learn your trade. I hope that, if Crane has got something, they don't throw him away. We've got to start planning.
Trail by 210
Another good tumble in the slips, this time by Joe Root, stops Usman Khawaja nabbing a single off Tom Curran. This is good stuff from Curran, stump to stump, and Khawaja can't get him away. He leaves everything that comes his way, and that'll be Curran's second maiden.
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Khawaja 65, Smith 13
Close again for Mason Crane as Usman Khawaja tries to flick him off his pads, and the ball drops just short of a diving Mark Stoneman. Stoneman moves closer in response.
That's a cracking response from Khawaja, coming down the wicket and slapping Crane back down the ground for four, but the number three isn't looking tremendously comfortable against the spinner. There's some drift and turn there for Crane, and Khawaja pushes a single away to get off strike and bring up the 50 partnership.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
England need to get a lead or get Australia out for parity. Then it becomes a one-innings match and Australia have to bat last.
That is an awful looking slower ball from Tom Curran, and he's lucked out that Steve Smith hasn't crashed it to the boundary. I think it came at Smith so slowly, and so high, that he didn't quite know what to do with it.
Curran readjusts and goes stump to stump, and Smith blocks. Maiden.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
The kid is doing alright. There is turn and there will be more as the game goes on.
Mason Crane's run-up is a replica of Stuart MacGill's, who I loved.
Usman Khawaja leans back to cut a delivery through backward point.
Oh, and is that a chance? Khawaja tries to steer Crane through short leg, but it's a flatter delivery and Khawaja doesn't read it. He drops the ball down just short of a tumbling Mark Stoneman.
We're having a change of ball again - that's the second time in this innings.
Mason Crane lurks behind Joe Root as he chooses a new one, before he flicks the ball from hand to hand.
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Matt Jones: The inexperience of England's bowling will cost here. A medium pacer in his second Test, a leggie in his first Test and a woefully out-of-form spinner in Ali as back-up for Broad/Anderson is a long way short of good enough for 20 wickets in Aus (So hope I'm wrong!).
Trail by 219
A fine leap by James Vince in the gully, flying to his left and sticking out a hand, stops an Usman Khawaja swipe running away to the boundary. Steve Smith fidgets and shuffles but he can't find the gap in the field, and Tom Curran completes a tidy over.
Elsewhere at the SCG, Mike Hussey is busy sledging Graeme Swann for being scared of spiders.