Carlos Brathwaite
West Indies all-rounder on Test Match Special

We will get a 20-run over or a wicket very soon I think. England will not meander along.

Eng 21-0published at 3 overs

3 overs

Target 208

There we go - he middled that! It's short from Rabada and Buttler clubs it into the leg side. A much-needed six for England.

A terrific yorker from Rabada limits England to just one. A frustrated Jason Roy dances down and chops into the ground.

You don't see this often - Rabada drops the ball during his run-up and it dribbles up towards Buttler, to the right of the pitch. It's called a dead ball.

Buttler swings hard, it goes up and over and the captain takes three.

England's openers just haven't found any real timing or rhythm yet.

Carlos Brathwaite
West Indies all-rounder on Test Match Special

There's a definite plan from South Africa to make England hit to the longer boundaries square of the wicket. They have largely gone pace off so the batters have to generate the power. It's much harder to set yourself.

Buttler takes a wild heave and sends the ball ballooning towards third man. Roy plays and misses at a delivery outside off. It was there to be hit.

Simon Mann
BBC Test Match Special

The crowd has been quiet this evening, probably because South Africa have been biffing it around and England have not got themselves going yet.

Lungi Ngidi is on the money straight away with a tight line which cramps both Jason Roy and Jos Buttler for space. Just one from the first three deliveries. Solid bowling.

Carlos Brathwaite
West Indies all-rounder on Test Match Special

There was a little bit on offer to the England bowlers early on in South Africa's innings. Can Lungi Ngidi and Kagiso Rabada capitalise on it?

Jos Buttler misses out on a leg-side delivery which should really be have been clipped down to fine leg.

A good opening over for South Africa. England can't afford too many of those.

We have the first England runs off the bat as Roy creams Rabada through backward point for four.

Andy Zaltzman
BBC Test Match Special statistician

England have attempted 200 plus chases 13 times and won two - both against South Africa.

A clear, dark night in Cardiff. Jason Roy on strike with Kagiso Rabada to open the bowling. And he begins with a wide.

These turnarounds are so quick. England skipper Jos Buttler and Jason Roy make their way to the middle. The tourists follow.

If they do pull it off, it will be England's third highest run chase in T20 cricket.

There wasn't a great deal to shout about from England's perspective, but this Jonny Bairstow grab was special. A class celebration, too.

Rilee Rossouw will hog the deadlines, but Reeza Hendricks played a terrific innings. He hit 53 off 32 balls at the top of the order.

Nice one, Tim.

We have seen 634 runs in 60 overs in less than 26 hours with the same group of players. Mind = blown.

And I reckon there will be plenty more runs still to come this evening.

A good test of England's famed big hitters that Liam Livingstone was talking about before play this evening. Will they chase this total down?

I'm handing over to my colleague Kal Sajad,who is on hand to talk you all the key moments. Should be fun.

Carlos Brathwaite
West Indies all-rounder on Test Match Special

England have a bit more power than South Africa but it won't be a walk in the park. I'd say that score is just about par.

Nevertheless a fine innings from Rilee Rossouw, who hit five sixes. Here's one of them off Richard Gleeson.

No century for Rilee Rossouw as he fails to get any bat on a wide yorker from Chris Jordan. A fine over to finish from Jordan which goes for just three runs.

How valuable will that over be?

England need 208 runs to win.