Glenn Maxwell, bed hair and chiselled stubble, continues to nibble away at the South Africa batters who are content to prod and poke his darts into the gaps.

Still no boundary conceded off his off-breaks.

The hundred is a up for South Africa which looked a long way away at 24-4.

Jonathan Agnew
BBC cricket correspondent on Test Match Special

Image source, Getty Images

It feels like a 270 or 280 pitch. It's a bit slow. But whether South Africa can get there remains to be seen.

LaLa: The Aussies need to go for the fifth and sixth wickets...bring in Marco Jansen and get into the tail-enders. Giving South Africa a sniff is a bad idea.

Geoff Lemon
BBC Test Match Special commentator

Pure strength over deep mid-wicket for six from Heinrich Klaasen.

That's gone miles back, consecutive sixes!

SA 95-4published at 27 overs

27 overs

It seems to be a different game for South Africa when Adam Zampa is bowling. You would not think he was the top wicket taker in the tournament until Mohammed Shami bagged seven wickets yesterday.

Heinrich Klaasen picks Zampa's wrong 'un and heaves the leggie into the stands over cow corner. Then repeats it the very next ball.

A release of pressure for the Proteas.

Geoff Lemon
BBC Test Match Special commentator

South Africa don't look too bothered that the score isn't moving along too quickly. As long as these two are out there, they'll think they can pick a few overs to pick it up.

Rather idiosyncratically David Miller undoes the fastenings on the straps of his gloves, then does them back up again.

Pat Cummins continues to provide accuracy and dogged persistence. Once again David Miller and Heinrich Klaasen notch up a single apiece.

Glenn Maxwell might get himself off to the Australian equivalent of deed pole and change his middle name from 'James' to 'Miserly' after another tight over.

Just two singles from it. His analysis reads 3-0-4-0 so far.

South Africa with not many on the board at the halfway point.

Firdose Moonda
Cricinfo writer on BBC Test Match Special

Rain has never helped South Africa so phantom rain might be the thing that does it.

We're seeing a different side to both of these batters, they're being very circumspect.

The sun is setting over Kolkata, mellowing from yellow to pink and those brutalist old fashioned floodlights now loom large above the ground at Eden Gardens, beaming down on the sward below.

Out in the middle Pat Cummins digs his fourth delivery into the pitch and Heinrich Klaasen, on his tiptoes, is able to skewer a cut over the leaping Steve Smith at backward point and to the boundary for four.

Geoff Lemon
BBC Test Match Special commentator

The Australians have been hot on the field. All the ground fielding has been excellent.

Glenn Maxwell is playing the percentages here. Content to keep it tight with his lines and lengths, and not offering any width.

Two runs of his two overs so far. South Africa's run rate is rather pedestrian 3.09.

Here's the South Africa wickets to fall so far...

Geoff Lemon
BBC Test Match Special commentator

It is all down to one mistake. Can Australia draw one mistake from this pair?

Australia don't just want to sit back and wait, they've got to keep the pressure on.

David Miller and Heinrich Klaasen pick up a single apiece off Pat Cummins' third over.

Miller has looked the most fluent of South Africa's batters having whacked Adam Zampa for a couple of sixes. Here's one of them.

Steven Finn
Former England bowler on BBC Test Match Special

Miller and Klaasen have a partnership now worth 44 after Australia's barnstorming start to the day.

South Africa are just fighting back slightly.

Glenn Maxwell bowls darts, declining to offer the flight and guile of Adam Zampa, and South Africa manage just a single off the over.

Tight start.