Well, that concludes yet another fascinating day of cricket in this Test series that continues to twist and turn.

We'll be back tomorrow for another busy day. At 8:00 GMT, England are taking on Sri Lanka in their final game of the ODI tri-series, hoping to finish with a win after they failed to reach Saturday's final.

And we'll also bring you updates from this Test match at 8:30 GMT - we look forward to you joining us. Bye for now!

There has been plenty of discussion around Australia's selection throughout this series.

Matt Renshaw returned to the top of the order, replacing Nic Maddinson, and he made a composed 74 while Cam Green added a valuable 65 in his first outing on the series.

With Josh Inglis also unbeaten on 85, these are positive signs for Australia's batting line-up despite yet another failure for Marnus Labuschagne, who made a five-ball duck, and in the absence of all-time great Steve Smith.

Plenty for South Africa to ponder after that day. The wickets came in pairs: Travis Head and Marnus Labuschagne in Simon Harmer's first over, followed by the quick departures of Cam Green and Matt Renshaw after they'd added 126 after lunch.

But South Africa let the game drift after tea, unable to capitalise on Marco Jansen's double. The pitch is playing nicely and the new ball offered very little, while Kagiso Rabada struggled for fluency throughout.

Australia take the lead in the final over of the day, nudging just one run in front.

The partnership of 145 between Alex Carey and Josh Inglis has put the tourists back in control of this gripping decisive Test. They have a great opportunity to take the game away from South Africa tomorrow.

50 for Alex Careypublished at 89 overs

89 overs

Aus 328-4

A sublime way for Alex Carey to reach a gritty 125-ball fifty, driving through the covers to end Gerald Coetzee's costly over.

Australia are just one run away from parity now.

And all of their hard work means they've earned the right to play some shots like this.

Josh Inglis moves into the 80s with back-to-back fours off Coetzee, the first upper cut and the second crunched past point.

Well, here's an indication of just how little the new ball has done for South Africa as Simon Harmer returns with it just seven overs old.

Inglis and Carey have batted exceptionally well this afternoon. They haven't done anything extravagant, just been discipline in defence, punished the bad ball and rotated the strike consistently.

Seeing as the new ball hasn't worked for Marco Jansen, Gerald Coetzee is going to get a go. It doesn't work, though - Josh Inglis flicks a full delivery off his pads for four.

Meanwhile Nathan Lyon is fully padded up in the Australian dressing room, ready to step in if they lose another wicket before the close.

Aus 306-4published at 86 overs

86 overs

Trail by 23

You can almost see the steam coming out of Rabada's ears, such is his fury.

He catches Josh Inglis off guard with a short ball and he top edges with very little control. There are cries of "catch!" but it sails over fine leg and into the stands.

Carey and Inglis survive another Marco Jansen over.

Feels like South Africa need at least one more wicket tonight to keep themselves in it. The new ball hasn't done much at all.

Ooh, bit of seam movement for Rabada as he pins Josh Inglis on the inside of his thigh.

We've got about half an hour to go. Is there another twist?

Close!

Josh Inglis continues to flirt with danger outside the off stump and the ball flies past the outstretched hand of Wiaan Mulder at point.

Four more, and South Africa's desperation for a wicket continues to increase.

Not much swing at all for Rabada to work with.

The game is just drifting, so South Africa need him or Jansen to do a Mitch Starc if they're going to get back into the contest here. And by that I mean take four wickets in six balls... as you do.

Going way over leg stump.

Will this change Kagiso Rabada's fortunes?

He strikes Josh Inglis on the pad and manages to convince Temba Bavuma to send it upstairs.

Short and wide outside the off stump isn't exactly how he'd want to start his spell, as Carey thumps the ball into the off side for a couple, but Jansen recovers well with five dots to test Carey's defence.

New ball takenpublished at 15:15 GMT 28 October

15:15 GMT 28 October

Here we go, then.

It feels like South Africa have put all their eggs into the new ball basket and now is the time to see whether that pays off.

Marco Jansen will take it.

More singles are ticked off Simon Harmer and Carey and Inglis bring up their 100 partnership. After Marco Jansen's quickfire wickets before tea, they have put Australia back on track and look very comfortable out there.

50 for Josh Inglispublished at 79 overs

79 overs

Aus 282-4

Too short from Markram, and hammered for four by Josh Inglis, who then nudges the final ball of the over for a single to bring up a composed half-century.

A fine return to the side for him, reaching the milestone off 76 balls.

Josh Inglis nails the reverse sweep to the ropes yet again.

It's been a really weird innings from Australia. An opening stand of 58, two quick wickets, a third-wicket stand of 126, two more quick wickets, and now a partnership of 90*.

South Africa haven't bowled particularly badly but they haven't been able to capitalise on the moments when they've been on top.