Beaumont and Taylor make centuries in partnership of 275
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Van Niekerk c Beaumont b Hazell 9 (SA 198-4)
England's catching is, erm, catching. After shelling four, they have held on to a second, Tammy Beaumont with a simple job at short third man after Dane van Niekerk slices Danni Hazell.
The encouragement from Sarah Taylor behind the stumps is pretty much incessant. "Come on ladies, great work ladies." This is good from Shrubsole, variations that aren't allowing South Africa to pierce the field. Only two from the over. The required rate is approaching 14.
Target 374
England shuffle their options, reintroducing Danni Hazell to bowl her darting off-breaks. Van Niekerk reverse sweeps and gets four, bluffing Hazell into firing the next delivery down the leg side for five wides. While this pair remain, South Africa have a glimmer of hope.
Sarah Taylor is up to the stumps as Shrubsole goes through the variations. Du Preez, not the tallest, is a fidgeter. Every item of kit is adjusted between deliveries. That's some stroke, a stroll across the stumps to drive down the ground for four.
Target 374
Something has to give here. South Africa will either pile on the runs or perish trying. Whatever happens, expect it to happen quickly. Du Preez is in on the act, twice lofting Hartley over the in-field for boundaries. Nine from the over, but even that doesn't keep South Africa up with the rate.
The South Africa skipper, Dane van Niekerk, joins her predecessor Du Preez in the middle. Looking again, Sciver either took that catch or had a ball in the face. England well on top now.
Isa Guha
Ex-England seamer on BBC Test Match Special
That's an important wicket because Wolvaardt was looking very threatening. Nat Sciver didn't need to move an inch, it was catching practice in the deep.
Wolvaardt c Sciver b Shrubsole 67 (SA 167-3)
England have caught one! It's not a typo. England cling on at the fifth attempt. Nat Sciver, who can do pretty much anything, shows the way, holding on when Laura Wolvaardt swings Anya Shrubsole towards the leg-side fence. Game over?
Isa Guha
Ex-England seamer on BBC Test Match Special
England are creating the pressure through dots. How will Wolvaardt respond?
Target 374
Left-arm spin, England redeploying the left-arm spin of Alex Hartley. They are rattling through them now. Hartley, 65 on her back, deliberately places the ball in her left hand and creeps to the stumps. A Wolvaardt smear brings a single on the off side, but it's one of only two in the over.
Brunt bounds in, continuing to use Laura Wolvaardt's toes for target practice. Only a leg bye from it. Never a bad time for a maiden. Has the sting gone from this one? South Africa need 10 an over. It seems an unlikely ask on this baking Bristol day.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
If Wolvaardt can clear the front leg like that, South Africa have got a chance. She's obviously got the technique.
Target 374
Wolvaardt remains. The wickets seem to have reminded her that she might actually have to score some runs. She clears the front leg and wallops Sciver to the leg-side fence. If you missed the wickets, have a look at these. A cracking yorker and a brilliant bit of fielding.
Looking again at the run out, Chetty was dawdling until she set off for the third run. It was actually Danni Wyatt who pulled off the diving stop, with Heather Knight providing the return. Those two wickets have made it much more unlikely that South Africa will pull off this chase.
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Daniel Potter: No need to panic. SA long way behind run-rate. Two ways of winning ODI are taking wickets or restricting runs. Most people forget the latter.
SA 143-2
All happening. 50 for Laura Wolvaardt, Mignon du Preez is the new bat. England will be feeling a little happier about life.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
England's ground fielding has been really good - it's just the catching which has let them down.
Chetty run out 6 (SA 142-2)
What has happened here? How often do you see someone run out coming back for a third run? Trisha Chetty is the one to go, her pretty brainless cricket undone by the brilliance of Heather Knight on the boundary. A dive from the England skipper, the ball returned to the non-striker's end, Chetty well short. Really daft.
Target 374
England are hunting further inroads, recalling Katherine Brunt to the attack. Brunt, not always the nasty fast bowler, has a big grin on her face as yorker after yorker seek the toes of Laura Wolvaardt. Have you seen the many lives of Lizelle Lee? We can guess what England will be working on for the next few days...
Looking again, Sciver just got the ball to tail in ever so slightly, a hint of in-swing and some dip beneath the bat of the bewildered Lee. Trisha Chetty is the South Africa number three. England will feel like they have this one back under control.