Moeen hits 67 off 59 balls to swing momentum
Root made 49 but failures for out-of-form Jennings & Malan
SA 226: Bavuma 46, Anderson 4-38
England 362: Bairstow 99, Stokes 58
Maharaj has the bit between his teeth here and he's causing all kinds of problems by bowling into that rough. And this pitch is doing him a lot of favours too, as we see the unpredictable bounce come into play again. This time it keeps about an inch or so above the ground and runs through for four byes.
Stokes is off the mark with four, hitting with the spin and sweeping Maharaj past backward square leg.
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Rob Meech: Remember when people said Cook, Hameed and Jennings would be our top three for years? It was only six months ago.
A bouncer from Rabada which goes well over the left shoulder of Root, who looks to hook but misses completely and ends up doing a pirouette.
Much more convincing next delivery, a textbook cut to send the ball crashing to the boundary. He plays that shot so, so well.
Back to Max's tweet (14:07 BST), what is the furthest you have travelled to watch a day of cricket? #bbccricket or text 81111
Michael Vaughan
Ex-England captain on BBC Test Match Special
England have the same problems that they've had for the past two years: number two, number three and number five. I'm sure most will - or they should - score runs against the West Indies.
Ben Stokes is the new man in and he is nearly in trouble almost straight away. Stokes opts to leave one from Maharaj and is hit on the pads. South Africa consider a review but it was missing the stumps. England under pressure here.
Phil Tufnell
Ex-England spinner on BBC Test Match Special
England are in the position where you think if someone can get a 50, or a 60, it can get them out of trouble. Stokes has that same rough to contend with, as a left-hander. He has to have a plan in his head of how to get past Maharaj.
Image source, Getty Images
Malan c De Bruyn b Maharaj 6 (Eng 72-3)
We said South Africa were targeting Malan with Maharaj's spin and they've succeeded. Malan takes a couple of strides forward, the ball finds the rough, bat onto pad, into the hands of short leg. Malan gone.
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Max Merrill: Heard it'll rain at 4! I've flown over from Berlin with my dad for this so whoever is doing a rain dance should stop right now.
We would be applauding Bavuma, had he held on. Nevertheless, another good over from Rabada goes by. He's bowling well, making the batsman play.
Phil Tufnell
Ex-England spinner on BBC Test Match Special
That was a great effort. It's the most difficult catch to take, with the ball swirling and arching away from you.
It was a tough chance but he got two hands to it! High and wide from Rabada, a wild flash by Malan who slices it up in the air. Bavuma chased it, got two hands to it but couldn't get it to stick.
It was tough.
It's getting breezy out there - umpire Aleem Dar has to keep picking up the bails which are blowing off. A slip and a short leg in for Malan, who pushes one into the off side and runs through for a quick single.
Maharaj bowls a full toss, a gift with a nicely-tied bow on top, as Root sweeps for a boundary.
The lead is now 203 for England.
India might have completed a series win against Sri Lanka earlier today but they'll be going into the third Test without Ravindra Jadeja.
Jadeja has been suspended by the ICC after reaching six demerit points within a 24 month period.
Jadeja was fined 50% of his match fee and given three demerit points after he threw the ball "in a dangerous manner" at batsman Dimuth Karunaratne on the third day of the Colombo Test.
He will miss the Test at Pallekele, which begins on 12 August.
Image source, ReutersRoot 15, Malan 2
We've seen invariable bounce in this match, as another one from Rabada keeps low, Malan doing well to dig it out. He then gets up on his toes and works a single off the hips.
Rabada drifts down leg and Root easily clips that down to the fine leg boundary for four. Straighter from the seamer next up, squaring up the batsman.
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David: Yes that is the end of Keaton Jennings! Surely Robson remains the sensible choice given his experience in Australia.
Root and Malan will need to steady the ship here now for England. A sweet bit of turn for Maharaj, with Root coming forward and playing inside the line. Prompting "oohs" and "aahs" from the fielders.
South Africa looking to target Malan with the field coming in. That's one way to counter it, getting down low and sweeping to the man at deep square leg. Promising over for Maharaj, two from it.
Andrew Samson
BBC Test Match Special statistician
Keaton Jennings finishes this series with 127 runs at an average of 15.87. His career average is down to 24.50.
I am sure there will be plenty of Keaton Jennings talk over the course of this afternoon, but are England in a spot of trouble here? The lead is 191, as Dawid Malan makes his way to the middle. Rabada continues with a nice tight line, close to the off stump and angling away.
Phil Tufnell
Ex-England spinner on BBC Test Match Special
England are just wobbling a bit. That's not a good shot from Keaton Jennings. This innings was a big test to him and he looked to be getting into decent shape before lunch, but that was too close to cut. It was more of a flick, rather than a cut, and he'll be very disappointed.
Image source, PAJennings c Amla b Rabada 18 (Eng 55-3)
Keaton Jennings is gone and what a terrible way to depart. Rabada bowling across to the left-hander, who looks to cut something that really isn't there to be cut. It's catching practice for Hashim Amla at first slip, but it's taken smartly.