Broad's 3-16 gives England the edge
Elgar 67 not out, De Villiers 49 for SA
England collapsed from 247-5 to 267-9
Compton 85, Bairstow 41 & Broad 32*
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Image source, Getty ImagesColin Docker: If England can get Elgar out in the next 5 overs they are well in control.
Mark Shuttleworth: Can Stuart repeat his summer heroics? You bet he can!
Ravichandran Ashwin has dismissed Dean Elgar four times, more than any other bowler, so Moeen Ali will fancy his chances against the left-hander. England's offie is managing to keep things tight now AB de Villiers is safely back in the hutch. Could that pressure bring another wicket?
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That's good to see. Chris Woakes walks back to his mark where Stuart Broad is waiting to offer some advice. The senior pro grips the ball in his fingers to demonstrate his point. Maiden over.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
"This match is nicely poised. You need patience to graft while batting because it's not easy to play lots of shots. It does a little bit for the bowlers but it will do less and less and, as the ball gets softer, will become harder to time for the batsmen.
"The match situation can change very quickly with quick wickets or two batsmen coming in and batting well. It's there for both sides to win this match."
Every now and again, Moeen Ali gets one to grip and spit at the batsman. One such delivery causes Dean Elgar a moment of alarm. There's still 27 overs possible today if the light holds, by the way.
Andrew Samson
BBC Test Match Special statistician
"South Africa still don't have a single century partnership in Test cricket this year and this is their eighth match."
The Sunday Times cricket correspondent has been doing some research, and it seems Broad enjoys taking the wicket of AB de Villiers...
SA 108-3
Time for a break. Samit Patel brings out the refreshments.
"Samit, where have the chocolate biscuits gone?"
Stuart Broad is shaping the ball back into the right-handers, meaning the one which nips away is always a potential wicket-taker.
Of far more interest is a man in the crowd who's dressed in full whites and helmet, is donning green ODI pads and leaning on his bat as though he's the next man in. Part of me hopes it's the beginning of a prank. I obviously can't condone such behaviour though...
SA 106-3
Image source, Rex FeaturesA woefully out of form Faf du Plessis - he averaged 8.5 against India in four Tests - replaces AB de Villiers at the crease.
He will surely try and settle into Dean Elgar's slipstream, the left-hander bringing up his half-century with a six off Moeen Ali.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
"That was a piece of beautiful bowling. Broad bowls a wonderful line and length and he got the batsman in no-man's land and thinking he should be leaving the ball. But you don't have time to change your shot, he caught in two minds and that was the end of his innings."
De Villiers c Bairstow b Broad 49 (SA 100-3)
Image source, Getty ImagesStuart Broad must surely be put in the world-class bracket now. Against one of the most destructive batsmen in the world, in his own back yard, and with the old ball doing very little on a lifeless pitch, he still finds the skill to wobble the seam past a set AB De Villiers' groping outside edge and Jonny Bairstow does the rest.
Big, big wicket. What a bowler, Broad is. Wow.
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Dave: The gripping thing about this match is both sides have inexplicable collapses in them.
Moeen Ali manages to beat Dean Elgar in the flight and has an lbw shout turned down by Rod Tucker.
The batsman responds nicely, flicking three through mid-wicket. Excellent fielding from Chris Woakes stops the boundary.
Jonathan Agnew
BBC Test Match Special
Image source, Getty Images"This will be a big spell for England and especially Stuart Broad as England are in need of a breakthrough now."
Umpire Aleem Dar interrupts play to remove a piece of paper which has blown onto the wicket. Like these things always do, the paper waits for the umpire to bend down before departing the scene via another gust.
Stuart Broad bowls a maiden to Dean Elgar, which is interesting in the fact he bowls over and round the wicket from alternate deliveries. Clever.
South Africa first innings: 95-2 (30 overs)
Batsmen: Elgar 41, De Villiers 47
Fall of wickets: 0-1 (Van Zyl 0), 14-2 (Amla 7)
Bowling figures: Broad 7-3-14-2, Woakes 8-0-20-0, Moeen 5-0-28-0, Finn 8-1-26-0, Stokes 2-1-7-0
England first innings: 303 all out (100.1 overs)
Fall of wickets: 3-1 (Cook 0), 12-2 (Hales 10), 49-3 (Root 24), 174-4 (Taylor 70), 196-5 (Stokes 21), 247-6 (Compton 85), 253-7 (Moeen 0), 253-8 (Woakes 0), 267-9 (Bairstow 41), 303-10 (Finn 12).
Not out batsman: Broad 32
Bowling figures: Steyn 25.1-5-70-4, Abbott 24-4-66-1, Morkel 26-5-76-4, Piedt 16-2-63-1, Van Zyl 2-1-2-0, Elgar 7-2-22-0.
SA 95-2
Now Dean Elgar is getting stuck into Moeen Ali, bringing up 1,000 Test runs with a lofted four back over the bowler's head. Alastair Cook has got a headache here.
Graeme Smith
Ex-South Africa captain on BBC Test Match Special
Image source, Reuters"De Villiers looks like he has so much time to play his shots. The key factor is how still his head is. The extra time he has enables him to just guide the ball into the gap in the field.