SA 193-8: Stubbs 72 (28), Hendricks 57 (33); Gleeson 3-51
Eng 234-6: Bairstow 90 (53), Moeen 52 (18); Ngidi 5-39
Bairstow hits 90 to continue sublime summer
Moeen bashes fifty off 16 balls - England's fastest fifty in T20s
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First T20, Bristol
I'd also heartily recommend you sit back and enjoy the best of his innings in the video below.
The action does not stop here though! The two teams will head down the M4 to Cardiff for the second T20 tomorrow evening. We will of course be back for that one with our live text commentary from 18:00 BST.
See you then.
England captain Jos Buttler to BBC Sport: "Really impressive. And I thought the way the guys stood up and took responsibility throughout that innings - Malan, Bairstow and Moeen Ali - were all fantastic. It was great to watch.
"I thought we were smart about it. We soaked up pressure when we needed to and put pressure back on when they felt they had a chance too. We knew we had a lot of power but didn't try to force it.
"We have been itching for that kind of performance. We scored over 200 against India at Trent Bridge and again here so really impressive.
"We knew it would be a tight game. It is a small ground and a great wicket. To pick up early wickets again was crucial and I thought the 18th over Chris Jordan bowled was brilliant and shift the momentum of the game."
James Anderson
England bowler on BBC Two
I think Jonny Bairstow will stay at four and that'll be very good for England.
England batter Jonny Bairstow to BBC Sport: "I'm feeling pretty good. The format changes are coming thick and fast so it's nice to start the series well. We're building towards the World Cup and we really need to keep putting our best foot forward.
"The wickets haven't been amazing batting wickets throughout the white-ball summer and we've set such high standards over such a long time there are going to be lapses. We've not been together as a one-day group for a long time and it's does take time.
"I'll be sleeping before tomorrow. We'll rest up and go again."
James Anderson
England bowler on BBC Two
Stubbs wasn't trying to smack every ball over the ropes. If he got a good ball, he knocked it for a single and rotated the strike. He's clearly got some nous.
This was the wicket that clinched it. Tristan Stubbs had no choice to go big but he only hole out to the boundary rider.
A wonderful knock though.
Isa Guha
Former England bowler on BBC Two
Remember the name - Tristan Stubbs is 21 years old and just hit 72 off 28 balls in his first international innings.
South Africa batter Tristan Stubbs to BBC Sport: "I was hitting it nicely but it was carrying on quite well too so I just got on with it.
"At the 10-over mark the comparisons came on the screen and we were the same and I thought we could do it, but we lost a few wickets in the middle
"The innings was pretty good, but we didn't win."
Ebony Rainford-Brent
Former England batter on BBC Two
Jos Buttler will be a happy man after a tricky start to his captaincy.
Chris Woakes
England all-rounder on BBC Two
England will take a lot of confidence from this performance into the rest of the series.
The headlines will likely go to Bairstow and Moeen but England were also excellent in the field, holding onto their catches in the deep.
South Africa in contrast dropped Bairstow, arguably the most in-form international batter in the world, three times.
Phil Tufnell
Former England spinner on BBC Two
It's been a six-hitting fest!
Ebony Rainford-Brent
Former England batter on BBC Two
The fans have been treated to some entertaining cricket.
Jonny Bairstow was incredible again. He's in the form of his life this summer.
That is a thumping win in the end thanks to some truly destructive hitting by England, Jonny Bairstow and Moeen Ali especially.
A wonderful knock from Tristan Stubbs kept South Africa's hopes alive but England kept taking regular wickets and in the end he ran out of partners.
SA 193-8
Another fine yorker by Chris Jordan restricts Keshav Maharaj to a single which wraps up a fine victory for England!
Great bowling from Chris Jordan as Keshav Maharaj and Lungi Ngidi can only scramble three runs and a leg bye from the first five balls.
Last delivery of the match coming up...
Chris Jordan to bowl the final over with the match already done.
I'm sure he will want to snatch a wicket mind...
Phil Tufnell
Former England spinner on BBC Two
A bit of a soft one for Gleeson but bowlers don't mind how they get them.
I reckon he'll definitely be on that plane to Australia for the T20 World Cup. England have found one.
Phehlukwayo c Rashid b Gleeson 22 (SA 188-8)
And another!
It's catching practice for England Andile Phehlukwayo lobs a full toss on leg stump from Richard Gleeson straight to Adil Rashid at square leg.
The end is nigh.
Chris Woakes
England all-rounder on BBC Two
Full, straight, fast - too good for Rabada.