Wayward again from Morris and Root cashes in. Four more to the total. That's really poor bowling.

Sweeper sent back to the cover boundary by Du Plessis. A battle won for England.

These two came together at 3-2 but have hit nine boundaries already including this one earlier.

Graeme Swann
Ex-England spinner on BBC Test Match Special

This situation is when Joe Root is at his most dangerous.

Short, wide and whacked for four.

South Africa captain Faf du Plessis tells Morris to go and have a bowl after that misfield and Root capitalises.

You don't want to bowl there when it's swinging like this.

The runs are flowing for England. We hear so much about them wanting to counter-attack from difficult positions. They've put away the bad balls in previous overs but in all fairness this should have been stopped by Chris Morris in the gully. He takes an age to get down to another thick edge from Ballance and the ball goes for four again.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

I watched Ballance in the warm-up and he was so anxious to get his head and chest forward and into the ball.

Much better from Gary Ballance. Last over he was still hanging back as he tried to drive but this time, despite not getting a big step, he gets his weight forward and punches for four.

That's poor from Morkel. He bowls on Ballance's hip and the batsman picks up another four. Morkel holds his hand up to apologise.

20 runs in the last two overs.

England have suffered a bit of wobble in their final group match of the Women's Cricket World Cup against the West Indies. From 47 without loss England have collapsed to 97-4 after 23 overs. Four of their big guns - Lauren Winfield (11), Tammy Beaumont (42), Sarah Taylor (0) and Nat Sciver (0) - are all back in the pavilion. Skipper Heather Knight (19*) is still there with Fran Wilson (2*). West Indies spinner Afy Fletcher has picked up 2-5.

Elsewhere, Australia are 120-2 at the halfway point against South Africa, India are 65-2 from 19 overs against New Zealand while Sri Lanka are 55-2 from 13 overs against Pakistan.

England are currently top of the points table and have already qualified for the semi-finals along with Austalia and South Africa. India and New Zealand are scrapping it out for the final place in the knockout stage.

Panic? What panic? Root drives beautifully for four. The crowd purr.

Another four to the skipper but this one is risky, just flashing in the air beyond Chris Morris in the gully.

Yes, yes, yes Joe Root. That is what he wanted previously. A perfect back-foot drive goes to the rope.

12 from the over.

Andrew Samson
BBC Test Match Special statistician

Gary Ballance now has 1,000 first-class runs in this English summer, at an average of 83.41. He's the third person to bring up that mark, after Kumar Sangakkara and Joe Denly.

Both me and my colleague next to me just exhaled simultaneously as Gary Ballance gets off the mark with a four.

He tentatively came forward and got a thick outside edge and the ball runs down to wide third man. I'm not sure Ballance was aiming there. Morne Morkel knows it. A moral victory to the bowler.

And Alastair Cook wouldn't have even had chance to take his pads off before Keaton Jennings followed him a ball later. In all fairness there was nothing Jennings could do. It was one of those when you hope you're lucky enough to miss it.

Root's ability to make me feel calm is incredible. He simply knocks the ball into the off side and runs through for one. It really isn't that easy. Vernon Philander is on the top of his game. There was a bit of confusion and a review needed but here's how he dismissed Alastair Cook.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

South Africa are pumped up. They recognise the opportunity. Faf du Plessis will bring some good tactics too, which Dean Elgar didn't in the first Test at Lord's.

Stephan Shemilt
BBC Sport at Trent Bridge

The Trent Bridge crowd has gone from euphoric to funereal. Where once they were cheering James Anderson from the field, now there is silent worry, concern that every delivery might bring a wicket. After two wickets in two balls, Root's shot to get off the mark brought a huge cheer, as if the saviour had arrived.

Six wickets have fallen this morning for 32 runs. If a bowler was asked to pick the perfect conditions to bowl in England I think it would be just like this. A watchful Ballance can't get his first run.

"Roooooooot". The skipper clips three off his pads on his first delivery to get off the mark. Gary Ballance on strike now who is yet to face a ball. What a test for him. This is where he needs to show his mettle.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

The perfect start for South Africa. Runs on the board are the crucial thing in this situation.

Ed Smith
Ex-England batsman on BBC Test Match Special

That's high-class swing bowling from Vernon Philander.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

I'm looking at the lbw and he's caught behind!