Daniel Norcross
BBC Test Match Special

Now Tahlia McGrath is motoring towards the target.

A punishing over from Chloe Tryon which stacks the game hugely in Australia's favour as Tahlia McGrath and Ashleigh Gardner take her for 16 runs.

Gardner cuts Tryon's first ball to the boundary for four before Gadner thrashes the spinner through the covers and mid-on for back-to-back boundaries.

Fortune favouring Australia's attacking intent as we approach the business end of the game.

A thick edge from Ashleigh Gardner 's bat off Masabata Klaas first ball races behind for another four. A chip shot from Tahlia McGrath at the end of the end of the set drops safe.

Australia need 41 off 42 balls to win.

Georgia Elwiss
England all-rounder on BBC Test Match Special

Australia have steadied the ship. I really felt like South Africa were around 15 runs short on this wicket and that'll prove the difference tonight.

Daniel Norcross
BBC Test Match Special

That is a sumptuous shot to end the over!

Image source, BBC Sport

Nonkululeko Mlaba, who has 1-6 at the start of the over, back into the attack as Sune Luus turns to her premier spinner in search of wicket.

Her second delivery is sliced through first slip as Tahlia McGrath dances down the track. Nadine de Klerk dives on the line to prevent a four.

McGrath slices another one but finishes the over strongly, driving the left-arm spinner through the covers for four.

Daniel Norcross
BBC Test Match Special

Australia's chasing hasn't been dominant.

Shabnam Ismail resumes after the drinks break. Tahlia McGrath is intent on charging her third ball and the Saffer quick bangs it in short.

McGrath deftly changes shot and swinging her bat like a machete hooks the ball to the boundary for four.

Australia are poised to go through the gears now.

Georgia Elwiss
England all-rounder on BBC Test Match Special

Australia are still in the driving seat but those three wickets will keep South Africa interested. It's not impossible but it's quite improbable.

Time for a quick drink.

Here's how Marizanne Kapp tapped Beth Mooney lbw a few moments ago.

Melinda Farrell
BBC Test Match Special

Tahlia McGrath plays every shot with such definition.

Nadine de Klerk strays on to Tahlia McGrath's legs and she swivels on her heels to help the ball on its way to the boundary through fine leg for four.

De Klerk overcompensates and bowls her next delivery wide and McGrath crunches a drive through the ring for consecutive fours.

Georgia Elwiss
England all-rounder on BBC Test Match Special

This isn't the fluent Australian batting line up we're used to seeing. They usually get the job done in 13 overs.

Masabata Klaas with a fine first over with just three runs from it as she does not allow Tahlia McGrath or Ashleigh Gardner to free their arms.

Nadine de Klerk in to the attack now.

Melinda Farrell
BBC Test Match Special

You would back Australia to get there but there's an opportunity here for South Africa.

Another of Australia's big guns also back in the hutch after Nonkululeko Mlaba bowled skipper Meg Lanning.

More left-arm spin as Chloe Tryon. Ashleigh Gardner chips her fourth ball down the ground but it does not have enough legs on it to reach the boundary.

Tryon, incidentally, took a great catch a little earlier to help dismiss Ellyse Perry off Marizanne Kapp.

Georgia Elwiss
England all-rounder on BBC Test Match Special

This is a good performance from South Africa, they're still in this game and are clinging on. They need to build pressure with the ball.

Marizanne Kapp continues as Sune Luus attempts to keep the pressure on Australia's batters.

Three dots and two singles from her first five balls before a no-ball gives Australia a free hit.

Kapp goes short and Beth Mooney pulls it for four.