That's brilliant from Klaasen.

He is very tired, unsurprisingly in this heat. But after crunching that six, he still pushes himself enough to run a quick two.

SA 281-5published at 42.1 overs

42.1 overs

Oh, that's huge.

Slightly short from Adil Rashid and Klaasen pounces.

That's gone 10 rows back.

Marco Jansen turns down a single that Klaasen wanted, but the throw from cover ricochets off the stumps and they get the run anyway.

Klaasen scampering a run from the final ball adds to England's frustration as the danger man keeps the strike.

Jay Perry: The decision to put South Africa in to bat was a sound one. This pitch will get better under the lights and fielding will get more difficult with the dew. The question is whether England have the minerals to exploit the massive advantage they had in winning the toss.

Launched over extra cover for four more!

Ominous.

50 for Heinrich Klaasenpublished at 41.1 overs

41.1 overs

SA 268-5

Drilled through the covers for four and Heinrich Klaasen reaches a half-century in style.

He's reined himself in since Aiden Markram's departure but looks like he is ready to hit the accelerator now.

Strap yourselves in.

Jonathan Agnew
BBC cricket correspondent on Test Match Special

The umpires have to be sympathetic about the over rate here. The heat just saps the life out of you and England are suffering. Ben Stokes and Joe Root train like men possessed. They are fit guys, but they are down on their knees.

Good running from the batters sees them take eight from Adil Rashid's penultimate over.

England's fielders are flagging, while the batters are still pushing hard between the wickets. It's certainly more like South African conditions than English.

The last thing England want here is to do any more running than necessary.

David Willey hurls the ball at the stumps after the South African batters threaten to run two, but the throw is wild and Harry Brook has to sprint around from the boundary to save three extra runs.

Steven Finn
Former England bowler on BBC Test Match Special

It felt like a good decision to bowl first but England's players might be sapped of energy by the time they come to bat.

Jonathan Agnew
BBC cricket correspondent on Test Match Special

If England can just get Heinrich Klaasen out they could keep South Africa in check, but they look drained in the field here.

Very good from Gus Atkinson. Very good indeed.

Just two runs from the over.

A crucial last 10 to come.

If Reece Topley's injured finger is holding him back, it really hasn't showed.

He's taken two quick wickets on his return.

Image source, Getty Images

Sri Lanka have steadied the ship against the Netherlands as they chase 263 for victory in Lucknow.

Sadeera Samarawickrama is unbeaten on 41 while Charith Asalanka is 35 not out to help them to 158-3 off 29 overs.

You can listen to live commentary of that match here...

I don't have that much authority on Jos Buttler's decisions, James.

James Gulleford: Ffion, if this pitch is such a belter then why on earth did Buttler put South Africa into bat!!!

Lovely work from Gus Atkinson, just four singles from his sixth over.

Here was another lovely bit of work from Jonny Bairstow earlier, that broke the dangerous partnership that was blooming between Aiden Markram and Heinrich Klaasen.

Marco Jansen, who is extremely tall, gets off the mark first ball.

A hugely important phase of the game, this. Jansen is South Africa's last recognised batter.

England have got to break the partnership early, while South Africa have got to make the most of it.

Deep Dasgupta
Former India wicketkeeper on BBC Test Match Special

You can understand what David Miller was trying to do. It was too full to go over mid-off and he could not get the elevation. It came out of the middle but went flat. South Africa are now in a tricky position.