The first of three one-day internationals is on Friday at 11:00 GMT.
Join us then.
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More from England captain Eoin Morgan: "It's extremely pleasing. Dawid and Jos were absolutely outstanding. To win a game in such commanding fashion builds a lot of confidence in the changing room.
"To be able to chase a total like that, given we didn't get off to an absolute flier, it's very encouraging signs."
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Captain Eoin Morgan on where England can improve: "Trying to put an all-round game together. The batting was outstanding today; the bowling was a little bit off. We've progressed nicely as the tour has gone on, so hopefully that continues, but striving for that collective perfomance is important."
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#bbccricket
Ed Smith: Malan finishing with a single surely a message to Morgan re ‘selfish’ rebuke a year ago.
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South Africa captain Quinton de Kock: "It's disappointing, but those guys played unbelievable innings. They blew us away.
"I thought they played really well and put our bowlers under a lot of pressure.
"We're not playing as badly as it looks. We're still getting together. It was always going to be difficult. Going forward the boys are still confident."
'I know I have the power'
England's Dawid Malan, who made 99 not out: "The last two innings I haven't hit it as well as I had liked, so to walk out and hit them like I did early on...
"I thought 190 might be a bit too many. We ended up getting a bit of momentum and the wicket played so well - it skidded on nicely. With a small boundary, it's really hard to defend.
"I was putting my foot down and taking the pressure off Jos. I know I have the power."
On ending on 99 not out: "I knew there were five runs left, but I didn't know how that would go down if I turned down the single."
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Bairstow, Stokes and Morgan didn't even get in.
How's stat?!
Andy Zaltzman
Test Match Special statistician
192 is the highest target successfully chased in T20 internationals for the loss of fewer than two wickets, and the fourth highest in all T20s.
More from Jos Buttler on Sky Sports, on the information from the analyst: "He's calling out the EuroMillions numbers!
"I don't think Eoin needs too much help, but he works closely with Nathan.
"You have to careful about how you use the information best."
Get Involved
#bbccricket
Nick: England batsmen have more T20 international 99s than T20 international 100s.
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England's Jos Buttler on Sky Sports: "It was phenomenal from Dawid. It's the simplicity he bats with. He's playing with a lot of freedom.
"He came in today, right from the off hit a couple of boundaries. That set him on his way.
"As soon as he came into the side, he got 70 or 80 in Cardiff and realised he can do it at this level. You play on better wickets and he's made the most of that.
"I've felt a little bit rusty, like I was searching for something. I've changed the way I look at T20 a little bit, learning from the West Indian guys, backing my six-hitting."
Post update
That was incredible, wasn't it?
England go to the top of the world T20 rankings.
It is the first time South Africa have lost a home series 3-0 and only the second time England have won 3-0.
Get Involved
#bbccricket
Si Lomas: Coming into this I wasn't sure if Malan stats and ranking as number one in world were a bit of an anomaly, I can safely say I was wrong, superb knock.
Harriavelli: Malan is currently a level above any other batsman in T20.
Post update
Malan is the third man to make 99 in a T20 international. The others are England batsmen, too - Alex Hales and Luke Wright.
Post update
That stand was worth 167, the highest in T20 international history.
England win by nine wickets
Eng 192-1
Dawid Malan ends on 99 not out!
He takes the winning single, but did he know there was only one to win?
Either way, England have chased down 192 with the minimum of fuss, led by the best T20 batsman in the world.
Post update
Tymal Mills
England bowler
This is world class from Buttler and Malan. They are making a strong total from South Africa look very much below par.
Live Reporting
Callum Matthews and Stephan Shemilt
All times stated are UK
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No time to draw breath, this tour moves on apace.
The first of three one-day internationals is on Friday at 11:00 GMT.
Join us then.
Post update
More from England captain Eoin Morgan: "It's extremely pleasing. Dawid and Jos were absolutely outstanding. To win a game in such commanding fashion builds a lot of confidence in the changing room.
"To be able to chase a total like that, given we didn't get off to an absolute flier, it's very encouraging signs."
Post update
Captain Eoin Morgan on where England can improve: "Trying to put an all-round game together. The batting was outstanding today; the bowling was a little bit off. We've progressed nicely as the tour has gone on, so hopefully that continues, but striving for that collective perfomance is important."
Get Involved
#bbccricket
Ed Smith: Malan finishing with a single surely a message to Morgan re ‘selfish’ rebuke a year ago.
Post update
South Africa captain Quinton de Kock: "It's disappointing, but those guys played unbelievable innings. They blew us away.
"I thought they played really well and put our bowlers under a lot of pressure.
"We're not playing as badly as it looks. We're still getting together. It was always going to be difficult. Going forward the boys are still confident."
'I know I have the power'
England's Dawid Malan, who made 99 not out: "The last two innings I haven't hit it as well as I had liked, so to walk out and hit them like I did early on...
"I thought 190 might be a bit too many. We ended up getting a bit of momentum and the wicket played so well - it skidded on nicely. With a small boundary, it's really hard to defend.
"I was putting my foot down and taking the pressure off Jos. I know I have the power."
On ending on 99 not out: "I knew there were five runs left, but I didn't know how that would go down if I turned down the single."
Post update
Bairstow, Stokes and Morgan didn't even get in.
How's stat?!
Andy Zaltzman
Test Match Special statistician
192 is the highest target successfully chased in T20 internationals for the loss of fewer than two wickets, and the fourth highest in all T20s.
Post update
Dawid Malan. Quite good.
Post update
Post update
More from Jos Buttler on Sky Sports, on the information from the analyst: "He's calling out the EuroMillions numbers!
"I don't think Eoin needs too much help, but he works closely with Nathan.
"You have to careful about how you use the information best."
Get Involved
#bbccricket
Nick: England batsmen have more T20 international 99s than T20 international 100s.
Post update
England's Jos Buttler on Sky Sports: "It was phenomenal from Dawid. It's the simplicity he bats with. He's playing with a lot of freedom.
"He came in today, right from the off hit a couple of boundaries. That set him on his way.
"As soon as he came into the side, he got 70 or 80 in Cardiff and realised he can do it at this level. You play on better wickets and he's made the most of that.
"I've felt a little bit rusty, like I was searching for something. I've changed the way I look at T20 a little bit, learning from the West Indian guys, backing my six-hitting."
Post update
That was incredible, wasn't it?
England go to the top of the world T20 rankings.
It is the first time South Africa have lost a home series 3-0 and only the second time England have won 3-0.
Get Involved
#bbccricket
Si Lomas: Coming into this I wasn't sure if Malan stats and ranking as number one in world were a bit of an anomaly, I can safely say I was wrong, superb knock.
Harriavelli: Malan is currently a level above any other batsman in T20.
Post update
Malan is the third man to make 99 in a T20 international. The others are England batsmen, too - Alex Hales and Luke Wright.
Post update
That stand was worth 167, the highest in T20 international history.
England win by nine wickets
Eng 192-1
Dawid Malan ends on 99 not out!
He takes the winning single, but did he know there was only one to win?
Either way, England have chased down 192 with the minimum of fuss, led by the best T20 batsman in the world.
Post update
Tymal Mills
England bowler
This is world class from Buttler and Malan. They are making a strong total from South Africa look very much below par.
Eng 191-1
Target 192
Four to extra cover.
Scores level.
Malan 98...