Aaron Finch
Former Australia captain on BBC Test Match Special

It was a big call from Pat Cummins to keep Starc on here for a sixth, but there's no point saving him overs for the end if he's going to blow the top order away.

Simon Mann
BBC Test Match Special commentator

Image source, Reuters

Well, he kept Starc on and it has paid off!

Mike Bell: Why on earth would you bat first in conditions that include a nearly 40% chance of rain?

Aaron Finch
Former Australia captain on BBC Test Match Special

The outfield is rapid, once it's past the ring it'll be four every time. Markram has to be patient and not try to over-hit it.

It's certainly a contrast to yesterday's opening blitz by India in Mumbai.

Australia persist with two slips which allows Aiden Markram to ride the bounce of the first ball of Mitchell Starc's sixth over and steer it into the legside for four. Nice shot.

That gives Markram the confidence to expansively drive at a wider one but once again Australia's razor sharp fielding prevents any runs off the bat.

Thanks, Sam.

Two of the four matches at Eden Gardens in this tournament have been low-scoring affairs. There's still a long way to go in this one.

I cannot stress enough how good Josh Hazlewood has been today.

Just remarkably consistency and the ability to move the ball both ways off the seam. He's been nigh-on unplayable so far.

Aiden Markram pinches a single from the last to deny him another maiden and that is the powerplay over.

It's time for me to hand over to Timothy Abraham, who might hope to oversee more than 18 runs in the next 10 overs.

Aaron Finch
Former Australia captain on BBC Test Match Special

Image source, Getty Images

It's unusual to see Mitchell Starc bowl five overs up front but he has been immaculate today after a tournament where he hasn't quite been at his best.

Geoff Lemon
BBC Test Match Special commentator

South Africa were absolutely desperate for that.

A boundary!

It has taken until more than halfway through the ninth over but South Africa have their first four of the match.

Full and on the pads from Mitchell Starc and Aiden Markram whips the ball through square leg.

It takes the Proteas past the lowest powerplay total in World Cup history - so that's something.

Aaron Finch
Former Australia captain on BBC Test Match Special

Image source, Getty Images

Australia have saved at least 20 runs in the field already. It has been clinical.

Geoff Lemon
BBC Test Match Special commentator

That was four from the moment it left the bat. Remarkable from Labuschagne.

What a stop that is from Marnus Labuschagne at extra cover!

Rassie van der Dussen times the drive nicely but the Labuschagne sprints to this left and puts in a full-length dive to stop it one-handed.

Three runs saved. There is just no let up from Australia with the ball or in the field.

Steven Finn
Former England bowler on BBC Test Match Special

I think India had 10 runs after three balls yesterday.

A third slip goes in after Rassie van der Dussen plays and misses at a rising delivery from Josh Hazlewood.

Those close catchers aren't brought into play in this over, though, and a single apiece for the South Africa batters take their side to double figures.

It has only taken eight overs to get there.

Steven Finn
Former England bowler on BBC Test Match Special

It gives you such a boost as a bowler to see your fielders diving around and backing you up like that.

Geoff Lemon
BBC Test Match Special commentator

Image source, Getty Images

Australia have bowled well but they are also really ramping up the pressure in the field. They are fielding like demons, nothing is getting past.