Postpublished at 14:09 British Summer Time 18 July 2017
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
Marizanne Kapp will know Tammy Beaumont quite well from being at the Surrey Stars together.
England win with two balls to spare
SA 218-6: Du Preez 76*, Wolvaardt 66
Wickets for Shrubsole, Sciver, Gunn & Knight
Taylor's superb stumping removes Chetty
England play Australia or India in Lord's final
Amy Lofthouse and Mark Mitchener
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
Marizanne Kapp will know Tammy Beaumont quite well from being at the Surrey Stars together.
Couldn't agree more, Ricky. Flat, dull wickets make for boring cricket and, with the women's game, really doesn't' showcase the talents that are available. The best women's game I watched was the Women's Ashes Test at the Waca in Perth, which was a belting pitch. Here's Marizanne Kapp and she strikes Winfield on the pads with her third delivery, but a healthy inside edge stifles any appeal.
#bbccricket
Ricky: After seeing a couple of women's matches this time, you can see the difference when matches are played on decent wickets.
Target 219
South Africa hit a boundary from the first ball of their innings. It's taken England one ball longer, as Lauren Winfield opens her arms and cracks a drive through the covers. Lovely stuff. Ismail gets a bit of extra bounce when she bowls and she keeps Winfield in line for the rest of the over.
Cheers, Mitch.
Here come England openers Tammy Beaumont and Lauren Winfield, whirling their arms and bats around as they stride to the middle. It's Shabnim Ismail to get the innings going.
The South Africans have had their huddle, England's openers Lauren Winfield and Tammy Beaumont are striding out, and it's time for me to hand back to Amy Lofthouse to talk you through the start of England's reply.
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It was left to Mignon du Preez to see the Proteas towards what they hope will be a competitive score - finishing unbeaten on 76 from 95 balls. Take a look at all five boundaries she hit today.
TMS are now speaking to Anya Shrubsole's father Ian Shrubsole - a Minor Counties cricketer himself, and a stalwart of club cricket in Bath. He and his wife have been watching the game with many of the other players' parents - apparently Sarah Taylor's mother Helen is a bit of a nervous watcher.
Asked about his daughter's injury, which saw the fast bowler limp off in the last over, he replied: "I don't know. Anya's always got some injury or other."
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Jenny Gunn made an important breakthrough with the first ball of her second spell, removing the big-hitting Chloe Tryon:
Captain Dane van Niekerk made a busy 27 from 39 balls for the Proteas, hitting the first - and only - six of the innings, but became the second player to be run out as she was sent back by former skipper Mignon du Preez.
But as she's done so often, England captain Heather Knight made a crucial breakthrough with the ball, in an eventful first over for the skipper.
Knight castled Wolvaardt with her second delivery, dropped a caught-and-bowled chance from Wolvaardt's replacement Marizanne Kapp off the very next ball, but then saw Kapp run out two deliveries later.
Teenage opener Laura Wolvaardt was impressive early on, reaching her seventh ODI fifty, while also hitting Natalie Sciver for successive fours.
However, I'm going to call this already as the champagne moment of the match, if not the tournament - a wicketkeeping masterclass from Sarah Taylor, who stumps fellow keeper Trisha Chetty down the leg side from a Natalie Sciver wide. Watch this - again and again!
While TMS convene a journalists' panel to discuss the World Cup, high time to review some of the highlights of that South Africa innings.
Opener Lizelle Lee successfully reviewed an early lbw decision with DRS - the first South African woman to do so - but was then bowled by her Western Storm team-mate Anya Shrubsole a couple of overs later:
There were just 17 boundaries and one six in South Africa's innings. Here's one of the later boundaries, from Mignon du Preez:
Meanwhile, if you've still got TMS on your headphones (and why not?), you can listen to BBC cricket correspondent Jonathan Agnew speaking to England men's coach Trevor Bayliss about the rather dismal defeat at Trent Bridge yesterday.
If you've not read Aggers' column about how England's "champagne cricketers" cannot "hide behind excuses" any more - it's worth a read.
South Africa batsman Mignon du Preez, who made an unbeaten 76: "I definitely think I haven't contributed like I would have liked in this tournament. To do it in a semi-final is really special. I think it was a lot slower than the last time we played but we did kind of expect that.
"I think wicket to wicket and taking the pace off the ball is a good option. We've got our plans covered and we look forward to defending our total. I think it's defendable with our bowling attack. It wasn't easy to bat on and I think we can put them under pressure."
So, England will need to score 219 to book their place in Sunday's Women's World Cup final at Lord's - where they would look to complete a hat-trick of home World Cup successes, having won on home soil in 1973 and 1993.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
We've seen some really good bowling today. England started off slightly off the mark but you felt they always kept control by bowling stump to stump. South Africa can't afford to lose Lee and Tryon - you need one of them to fire. Mignon du Preez held things together but you feel it's not enough.