England win by 109 runs
SA 262 all out: Tryon (70), Kapp (62), Wolvaardt (56); Davidson-Richards 3-35, Dean 3-42, Lamb 3-42
Eng 371-7: Beaumont 119 (107), Lamb 65 (66), Knight 63 (49); Khaka 2-64
England lead multi-format series 8-2 before three T20s
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Jonathan Agnew
BBC cricket correspondent on Test Match Special
That is just a free hit to someone who has scored a hundred.
It is just one-way traffic. I can't see anyone out there for South Africa, apart from maybe Shabnim Ismail, who can do anything to stop this.
#bbccricket
Peter: I kinda think Tammy's made her point today, don't you?
Width ... and smashed over extra cover.
Width ... and slashed past point.
This is becoming painful for South Africa.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
That is nicely placed. Tammy Beaumont has her eye nicely set at the moment.
Tammy Beaumont is just having a net session now.
She reverse scoops Nadine de Klerk for four over her shoulder, as easy as you like.
Anya Shrubsole
Former England bowler on BBC Test Match Special
South Africa have just been off the pace.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
South Africa have had a bad day, crikey, they really have, since the toss really.
You wonder at what point the captain realises she's dropped a clanger here.
I just cannot even imagine how you'd feel as a bowler having to bowl first today.
I played yesterday and it was roasting. We ended up bowling first but we lost the toss - if my captain had chosen to do that I would be absolutely raging.
If the opposition then cruised to 214-1 with almost 20 overs left ...
Tammy Beaumont has looked in supreme touch today.
Alison Mitchell
BBC Test Match Special
It has been part of South Africa's problem that they haven't been able to show the discipline to bowl to their fields.
Even the ones that Dunkley mistimes go for four. She barely connects with one that is dragged out to mid-wicket and still dissects the two boundary fielders.
Oh, to be that good.
Nadine de Klerk resumes for South Africa after the break. She's not had the best series, but she has impressed me with her fight and effort, and starts her over by beating Sophia Dunkley outside the off stump twice.
Anya Shrubsole
Former England bowler on BBC Test Match Special
I'm really chuffed for Tammy. It would have been a difficult week for her but this is credit to her mental toughness.
Beaumont 101, Dunkley 17
Dunkley plonks one down the ground for two runs to bring up England's 200. They are on for a huge total here.
Time for a well deserved drink. Time for a siesta too, anyone?
Image source, BBC SportIt has been a chastening afternoon for South Africa but you can't say they haven't created chances...
Alex Hartley
Former England bowler on BBC Test Match Special
Tammy Beaumont always does well when she's got that bit between her teeth, a point to prove. Exceptional.
Alison Mitchell
BBC Test Match Special
Beaumont punches the air. She gets a hug from Sophia Dunkley. This has been a dominant display from one of England's best. She's deserving of this rapturous ovation.
Eng 198-1
An utterly dominant innings coming from just 93 balls.
Dropped from England's squad for the T20s and the Commonwealth Games, and a century in response.
England are in cruise control and Tammy Beaumont is not done yet!
Tammy Beaumont sweeps and sweeps for four ... twice!
This is a demolition job.
She's on to 98.
Alex Hartley
Former England bowler on BBC Test Match Special
How do you set a field for someone who hits the ball like this?