SA 6-0published at 1 overs
We could see some fireworks here as South Africa have no choice but to go for the big win.
Chris Woakes will open up at the other end.
England reach semis despite defeat
Australia through as runners-up
England reach 132 to knock SA out
Rabada takes final-over hat-trick
Moeen 37 (27), Malan 33 (26)
Roy retires hurt 20 with leg injury
SA 189-2: Van der Dussen 94* (60)
Markram 52* (25), De Kock 34 (27)
Super 12, Group 1, Sharjah
Thomas Mallows and Callum Matthews
We could see some fireworks here as South Africa have no choice but to go for the big win.
Chris Woakes will open up at the other end.
Carlos Brathwaite
West Indies all-rounder on BBC Test Match Special
That was a good sign of intent from De Kock.
Simon Mann
BBC Test Match Special
Good stroke from De Kock.
Quinton de Kock gives himself one ball to suss out Moeen Ali before powering the next delivery through the offside for a one-bounce four.
A small pocket of England fans belt out a rendition of Jerusalem as Reeza Hendricks gets off the mark with a single.
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Quinton de Kock and Reeza Hendricks have bat in hand for South Africa, with Moeen Ali opening for England.
Seems unlikely but stranger things have happened.
Andy Zaltzman
BBC Test Match Special statistician
If I have done the maths right, if South Africa score 180 and England are bowled out for 80 England would go out.
Jonathan Agnew
BBC cricket correspondent on BBC Test Match Special
There a few England supporters I can see.
Phil Tufnell
Former England spinner on BBC Test Match Special
England are so strong in every department. The one thing South Africa have is a very good bowling department.
England make one change as fit-again Mark Wood comes in for Tymal Mills, who has been ruled out of the rest of the tournament through injury. South Africa are unchanged from their win against Bangladesh.
England: Jason Roy, Jos Buttler (wk), Dawid Malan, Jonny Bairstow, Liam Livingstone, Eoin Morgan (capt), Moeen Ali, Chris Woakes, Chris Jordan, Adil Rashid, Mark Wood.
South Africa: Quinton de Kock (wk), Reeza Hendricks, Aiden Markram, Temba Bavuma (capt), Rassie van der Dussen, David Miller, Dwaine Pretorius, Kagiso Rabada, Keshav Maharaj, Anrich Nortje, Tabraiz Shamsi.
South Africa captain Temba Bavuma: "If the toss had gone our way we would have bowled. We will have to start well with the bat. We know it can be tough at the beginning but will have to see what total we can put up.
"At the beginning, the first six overs, we will play as normally. We want to get to a position where we can lay a foundation and be able to make those changes."
England captain Eoin Morgan: "The results here has suggested chasing does help against Sri Lanka things did help chasing so for obvious reasons we will do the same again.
"Trying to anticipate how much dew will come in will be quite difficult."
Australia's win against West Indies has moved them up above South Africa and into second in Group 2, with England still top thanks to a comfortably superior net run-rate.
It means South Africa need to win by around 60 runs to have a chance of overhauling Australia again and reaching the last four.
An early boost for England as Eoin Morgan wins the toss and chooses to have a bowl first.
No real surprise as chasing teams have won the majority of matches at this tournament so far.
Four games, four wins. It has all been rather comfortable for England at the T20 World Cup so far, with a semi-final place tantalisingly within reach.
Can they finish the job against South Africa?