Bairstow, who was hit on finger by Cummins, impresses with brilliant century
Stokes, in visible pain with side injury, hits 66 off 91 balls
Stokes dropped on 9 & survives ball hitting stumps but not dislodging bails on 16
England lose three wickets for no runs in 70 balls either side of lunch
Malan caught at leg slip & Root slashes to slip
Both England openers out cheaply after being bowled through the gate
Daily highlights on BBC iPlayer from 17:00 GMT
Mark Wood sees off the rest of Pat Cummins' over.
What will England do now? Does Jonny Bairstow continue to attack? Does he look to manoeuvre the ball and get the 44 runs that England need to make Australia bat again? What is he actually physically capable of doing?
Mark Wood has joined the struggling Jonny Bairstow out in the middle.
England are still 44 away from avoiding the follow-on.
Jim Maxwell
BBC Test Match Special
It was a good field placing, but can't say it was a great shot.
Ian Chappell
Former Australia captain on Test Match Special
That leaves Bairstow with no choice. He has to stick out there.
Buttler c Khawaja b Cummins 0 (Eng 173-6)
One brings two.
Pat Cummins has a very good track record of dismissing Jos Buttler in Test cricket and he's got his away.
It is a really soft and tame dismissal. It is just a little chip, checked drive, into Usman Khawaja at short cover.
A second duck for England. They are going for that record again.
Ian Chappell
Former Australia captain on Test Match Special
Bairstow is finding out what he can and can't do. That's part of batting injured.
Jonny Bairstow is really struggling after that blow to the thumb. Every shot - particularly those into the off side - is bringing a grimace.
He has scored 42 off 38 balls against Nathan Lyon in this innings.
The physio is out again. Will Bairstow be able to keep going?
Steven Finn
Former England bowler on BBC Test Match Special
That's a wonderful shot, almost one-handed.
Six more!
Jonny Bairstow is going into ODI mode.
He again gets down low and slog sweeps, but this time much squarer.
Bairstow is up to 69.
Scott Boland is off the field and has gone for a scan, by the way, after falling over in his follow through on the final ball before tea.
Australia will provide an update in due course.
If you're just joining us, then morning.
It's been a mixed bag for England, who suffered another batting collapse after rain delayed the start of play by two hours.
They quickly found themselves 36-4, with Joe Root bagging England's first duck of the year as they lost three wickets in 53 balls.
However, a gutsy 128-run stand between a visibly injured Ben Stokes and Jonny Bairstow lifted England's spirits before Stokes fell lbw to Nathan Lyon for 66.
Bairstow has taken an absolute peppering, including an awful hit to the thumb by Pat Cummins, but he's still there on 61 alongside Jos Buttler.
Jos Buttler defends and leaves the rest of Pat Cummins' over.
It is murky over the SCG. The floodlights have been on all day. It'll be interesting to see if the light does hold and allow us to play until 07:30 GMT.
Steven Finn
Former England bowler on BBC Test Match Special
You don't want to hyperbolise the situation, but you'd be amazed if that's not broken in a couple of places. It's giving me shivers.
Jonny Bairstow looks like he is going to try and carry on, but his thumb has been heavily taped.
He's just played a shadow shot and he seems happy. The SCG give him a round of applause.
Steven Finn
Former England bowler on BBC Test Match Special
That's a nasty one to receive. It's real big trouble. If that's not a completely busted, broken thumb, I'll be amazed.
Jim Maxwell
BBC Test Match Special
That really hurt him. He's in trouble.
Jonny Bairstow is in trouble here. Pat Cummins has hit him on the thumb.
The ball flew over the slip cordon and Bairstow hopped, skipped and jumped down to the non-striker's end, while constantly shaking his hand.
He immediately falls to the floor, takes off his helmet and calls for the physio.
That could be a break.
I'm not being negative, but England do have a long tail. They are still 53 runs away from avoiding the follow-on - that is England's first aim.
Jos Buttler is the new batter.
Steven Finn
Former England bowler on BBC Test Match Special
Image source, Getty ImagesJust as England were turning the tide, Australia throw a counter-punch. Lyon skipped one through and as soon as it hit Stokes he turned around and walked off. It was a gallant effort.
Jonathan Agnew
BBC cricket correspondent on BBC Test Match Special
Stokes had already walked. Australia look relieved.