Dean stars with four wickets; Wong takes three wickets on debut
Dunkley hits her first ODI century - off 87 balls
Lamb and Beaumont put on 127 for first wicket
England now lead multi-format series 6-2
Highlights on BBC iPlayer from 07:00 BST on Saturday
Lamb c Mlaba b Tryon 67 (Eng 127-1)
South Africa have the breakthrough!
Emma Lamb will be furious with herself. It was a filthy full toss that Lamb could've hit anywhere but instead she miscues it horribly and straight into the hands of Mlaba at short fine leg.
Another fine performance from Lamb.
Tickled round the corner calmly by Tammy Beaumont off the spin of Chloe Tryon and that brings up her half-century.
A fine innings, played with real patience and discipline in the past few overs after a rapid start. She looks up for it today.
Mlaba drops short, and Emma Lamb powerfully heaves it away for four.
They're racing along now.
Melissa Story
BBC Test Match Special
I've played in France against the French cricket team. I didn't recognise the beret! They didn't play with them on. We played on their national ground which was a local park with dogwalkers on it!
Lamb 61, Beaumont 47
South Africa haven't looked up for this from the start, to be honest. It's been tough going out there, but there wasn't even much enthusiasm at the start, which is a shame.
Ohhh that looks painful.
Beaumont crunches a drive straight to Shabnim Ismail at mid-off but the ball bounces awkwardly and ricochets off her knee, allowing the batters to run two.
She drops to the floor and winces in pain. She's not had a fun return to international cricket so far.
Daniel Norcross
BBC Test Match Special
Lamb has chopped that away beautifully! The timing of that was impeccable!
It doesn't matter in the slightest if Tammy Beaumont's scoring has slowed because Lamb is cashing in.
She hoicks De Klerk over mid-wicket before giving herself room and cutting firmly past point.
Classy batting.
Alex Hartley
Former England bowler on BBC Test Match Special
Tammy Beaumont seems to have got a little bogged down in the last 3 or 4 overs.
Lamb sweeps for two more to conclude Mlaba's latest over and England are basically having a net session now.
Alex Hartley
Former England bowler on BBC Test Match Special
Image source, Getty ImagesI've been really impressed with Emma Lamb. She has made international cricket look easy!
Hundred in the last game and now a half-century! Sublime effort from Emma Lamb, it's been chanceless.
She's really proven that she is ready for this level after a difficult start to her international career.
Oooh, nearly!
Tammy Beaumont miscues a short ball horribly and it loops up towards square leg where the fielder sticks out an arm and it just evades her fingertips. Not a great shot and not a great fielding effort, really. Again.
100 partnership for Emma Lamb and Tammy Beaumont and it's looked supremely straightforward.
Bizarre scenes on the pitch with that review and bizarre scenes in the commentary box as Alex Hartley sends her co-commentator Melissa Story to go and find her sunglasses, only to realise that she's wearing them.
What is happening.
Alex Hartley
Former England bowler on BBC Test Match Special
Sune Luus doesn't feel like a natural captain. You can't be a fine leg deep third when you are trying to rally the troops. You have to be leading by example, not going and standing on the boundary.
Nope, drifting down leg.
Odd. They literally appealed and reviewed that with a limp shrug. They didn't think it was out, you could tell, so what a weird review.
Daniel Norcross
BBC Test Match Special
There was no enthusiasm with that appeal!
Ermmm, OK.
The most half-hearted appeal you'll see from Nonkululeko Mlaba results in a review. Literally nobody looked convinced.
This is the only chance they've had all game so far, it stinks of desperation.
Emma Lamb has 42 not out and has just picked up exactly where she left off in Northampton.
Daniel Norcross
BBC Test Match Special
South Africa have got their plans all wrong at the moment. It's been a strange old bowling performance.