Simon Mann
BBC Test Match Special commentator

Image source, Getty Images

Ben Stokes was looking to force it through the off side. He looks injured and beaten.

Steve Smith is as happy as a child at Christmas.

Michael Vaughan
Former England captain on BBC Test Match Special

If Ben Stokes cannot run, it may well break Jacob Bethell's rhythm. It would have been better with Brydon Carse out there.

Jacob Bethell immediately calls Ben Stokes through for a single, which is a little unkind on his injured captain.

Stokes ducks under a couple of Marnus Labuschagne bouncers and then takes a leisurely single to get his innings under way.

Wide and a dot to finish.

A lot is resting on Bethell's young shoulders now. England lead by 84 runs.

Michael Vaughan
Former England captain on BBC Test Match Special

There was not a single there but it was Jamie Smith's call. Good fielding from Marnus Labuschagne at the non-striker's end.

A nice partnership was just getting going and then panic sets in.

Oh, go on - let's watch the moment of the day again!

Too short and too wide from Beau Webster and spanked through the covers for four by Jamie Smith.

Seven off the over - three for Jacob Bethell, who moves onto 123 (201), and four for Smith (26 off 41).

Time for drinks! 45 minutes to go on day four.

Another three singles. Jamie Smith survives.

Marnus Labuschagne sends down a bouncer. Jamie Smith ducks.

Next ball, he dabs it towards point and walks a single. Safe. For now.

Jonathan Agnew
BBC Chief Cricket Commentator on Test Match Special

I'm not sure if I can watch Marnus Labuschagne bowl to Jamie Smith again.

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Alex Carey is up to the stumps again. Travis Head concedes three runs - two singles and a wide.

Whistles around the SCG as Marnus Labuschagne limbers up. He's coming into the attack to bowl to Jamie Smith.

Cover. Your. Eyes.

Michael Vaughan
Former England captain on BBC Test Match Special

Seeing how Jacob Bethell has played - his technique is incredible. To play at this level for long periods of time, you have to have that.

He has played the ball straight, right under his eyeline.

Good adjustment from Jamie Smith to read the bounce from Michael Neser, opening his bat and guiding the ball through gully for four. 250 up for England - something that didn't feel particularly likely when Zak Crawley departed in the first over.

Travis Head returns for his second over of the day, replacing Beau Webster.

Jacob Bethell and Jamie Smith rotate nicely to add five runs to England's lead. Smith will be desperate not to get out to a part-timer after his first-innings nightmare against Marnus Labuschagne.

Top of the mornin' to you. Ready for a catch up on what's been occuring while you have been having your beauty sleep? Well there's been a maiden Test century for Jacob Bethell for starters...

England began day four with an injury. Captain Ben Stokes suffered a right adductor issue inside the opening half hour and had to leave the field.

But Josh Tongue struck twice in quick succession to remove Steve Smith (138, caught behind) and the dangerous Mitchell Starc (five, bowled) and Will Jacks accounted for Scott Boland to end Australia’s innings without too much lower-order chaos.

From 518-7 overnight (leading by 134), Australia were bowled out for 567 to lead by 183. Beau Webster was unbeaten on 71.

It was a familiar start to England’s second innings, Starc striking fifth ball to remove Zak Crawley lbw for 1.

And they should have been two down at lunch, Cameron Green needlessly diving across Smith at second slip to hand Ben Duckett a life on 38: England 80-1 at the interval.

Duckett failed to capitalise on his reprieve - bowled for Michael Neser for 42 - before Boland removed Joe Root lbw for six.

But Jacob Bethell stood firm, steering England to 174-3 at tea alongside Harry Brook.

In the opening 30 minutes of the final session, England's fourth-wicket pair overturned Australia's lead before the introduction of Beau Webster.

Jacob Bethell brought up his first Test century - and his maiden first-class ton - by dancing down the track to Webster's part-time off-spin and whipping him over long-on for four.

But he watched on at the other end as Webster removed both Harry Brook and Will Jacks in the same over. Brook's brain had started to become scrambled, and he was trapped lbw for 42 - given on review - while Jacks played the daftest of shots to go for a duck, caught in the deep.

England are 245-5, leading by 62. Bethell is unbeaten on 116, while Jamie Smith is 15 not out.

A bit of a tired shot from Jacob Bethell as he plays and misses at a wider delivery from Michael Neser.

No matter, next ball he's galloping down and picking up a single after it was half-stopped by Marnus Labuschagne in the covers.

He's up to 112 (84) and Jamie Smith has 14 (28).

Jonathan Agnew
BBC Chief Cricket Commentator on Test Match Special

I am still wondering what on earth is going on with this batting - apart from Jacob Bethell.

Completely weird.

Beau Webster is bowling with a smile on his face - and why not? Two wickets in three balls earlier in the session and respectable figures of 2-30 from his seven overs.

Thanks Tim! An excellent innings from you.

Well, it's been an action-packed first half of the session, hasn't it?

England will be hoping for a bit of calm in the final 70 minutes of day four.