Pat Cummins is a little frustrated after Temba Bavuma gloves his fourth delivery down the leg side and picks up a couple.

Cummins responds by moving a leg slip into place for the remainder of the over.

Another over of Nathan Lyon is seen off by Temba Bavuma, who has decided to absorb most of the pressure from the Aussie off-spinner.

There was some nip off the seam from Pat Cummins which results in Temba Bavuma playing down the wrong line with his defensive shot.

However, the ball-tracking technology shows it would have bounced over the stumps.

This could be big...Temba Bavuma struck on the pad by Pat Cummins.

Given not out on the field.

However, it looks very, very close.

Cummins reviews.

Temba Bavuma calmly sees off five balls without scoring from Nathan Lyon before going deep into his crease and nudging the final delivery into the leg side to keep the strike.

South Africa need Bavuma to settle in for the long haul here.

Australia skipper Pat Cummins decides to bring himself back after the interval.

Not a great deal to cause Marques Ackerman and Temba Bavuma any angst as they manage to pick up a single apiece.

Nathan Lyon with the first over after tea.

His third delivery grips and turns and Temba Bavuma does well to get his bat out of the way playing back.

Six dots from Lyon.

Marques Ackerman and Temba Bavuma stroll back out to the middle following the conclusion of the tea interval.

Australia's players follow shortly after.

This feels a vital session in the context of this Test match.

Image source, Getty Images

That session started OK for South Africa as they knocked over the last two Australia wickets for the loss of only 18 runs after lunch but those two wickets really hurt.

Aiden Markram drove straight to mid-off in the third over and David Bedingham was bounced out for the second time in the Test.

He had just been hit in the chest by Mitchell Starc when he tried another hook to Josh Hazlewood. He top-edged the ball to Nathan Lyon in the deep and had to slump off.

At tea, South Africa are still 47 runs behind Australia's first-innings total with eight wickets left.

Graeme Smith
Former South Africa captain on Sky Sports

Marques Ackerman has played really well. He's looked assured and in control of his game. South Africa will be hoping for something big from their captain Temba Bavuma.

And that is indeed tea.

South Africa need to have a bit of a think about what they're doing.

They have thrown two wickets away and have done their best to give two more with run-outs.

South Africa seem intent on chucking this away.

On the stroke of tea, Marques Ackerman is more than halfway down before being sent back by his captain Temba Bavuma. He had given up when Cooper Connolly's throw comes in. Thankfully for the opener the throw misses.

It is indeed outside the line.

Left-hander Ackerman is batting on off stump to Nathan Lyon. Australia's spinner is going to have to pitch it straighter than that.

Wicketkeeper Alex Carey likes this. He really likes this.

It's an lbw shout against Marques Ackerman. I wondered if he'd got outside the line.

Watching again, it was a lovely set up from Australia too.

Mitchell Starc hit David Bedingham with one bouncer and followed with two more.

Then, when Bedingham was on strike in the next over, Josh Hazlewood teased South Africa's number three with two length balls to make him think the bouncer ploy had gone for now.

But then came the one banged in short, Bedingham's eyes light up and you know the rest.

Graeme Smith
Former South Africa captain on Sky Sports

David Bedingham did not get himself in a strong enough position to take on the pull shot for his dismissal. He has to open himself up again from a closed-off position. He's looked in good order with the rest of his game, so he just has to leave that shot alone.

The replay of David Bedingham's hook shot is being played again and again on TV. Graeme Smith is not impressed.

For a moment I forgot David Bedingham was out hooking in the first innings. A real shocker.

Almost a run-out next ball!

What are they doing?!