Bangladesh eliminated with loss, South Africa now in good position to reach final four
South Africa fall to 33-3 in low run-chase - two wickets for Taskin
Rabada rips through Bangladesh top order with three wickets
Bangladesh never recover; struggling against SA pace bowlers (Nortje 3-8)
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We'll be back at 13.45 BST for the second match of the day to see whether Pakistan can continue their winning streak against Namibia.
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For Bangladesh, their hopes have come to an end. A difficult tournament where they failed to win a game.
Losing Shakib Al Hasan for this fixture was a big blow to their chances but it was probably still too much of an ask.
Are South Africa peaking at the perfect time?
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Player of the match Kagiso Rabada: "The wicket favoured the seamers and I'm just glad that today was my day.
"Every time we have the opportunity to practice we try and implement what could possibly work for us and we always train hard and I guess today it worked for us.
"It is nice to see some swing again, particularly in the T20 format. I've played a few IPL games here and it wasn't a surprise to see that because we've seen it for quite a period here before."
That win takes South Africa to second in Group One behind England.
Their net run-rate is now far superior to Australia's, who are behind them, so they've given themselves a very good chance of qualifying.
Alex Hartley
England spinner on BBC Test Match Special
South Africa are finding their rhythm at the right stage and that is what you need in tournament cricket. Momentum is key and Australia will have been watching closely and they'll be under pressure now because it will likely come down to net run-rate between those two sides and Australia's heavy defeat to England could be detrimental.
Temba Bavuma finishes with 31 not out. He was under pressure when his side lost three early wickets, but played with the right amount of calmness and aggression to lead the chase.
Alex Hartley
England spinner on BBC Test Match Special
A chase of 120 could have been really interesting.
Bangladesh put pressure on throughout.
Aatif Nawaz
BBC Test Match Special
That is definitely going to help their net run-rate tremendously and extend their advantage in second place.
It was quite empathic from South Africa and a really clever performance and use of conditions.
David Miller crunches the ball through midwicket for four and seals the win for South Africa!
Bangladesh's difficult tournament continues as they register their fourth successive loss.
Need 3 runs from 40 balls
Bavuma takes another single.
Need 4 runs from 41 balls
David Miller is off the mark straight away and gifts the strike to his captain to get the job done.
Alex Hartley
England spinner on BBC Test Match Special
The are never easy to take because you've got to look over your shoulder as you try and gauge the catch.
Aatif Nawaz
BBC Test Match Special
That is a quite magnificent catch. It is a consolation wicket on a difficult day for Bangladesh.
van der Dussen c Shoriful b Nasum 22 (SA 80-4)
What a catch!
Rassie van der Dussen tries to win the game with a six, but Shoriful spoils his fun by pulling off a remarkable catch running backwards and putting in a full-length dive to grab it inches off the ground.
The victory will go South Africa's way but that's given Bangladesh something to celebrate on a difficult day.
Need 5 runs from 43 balls
Even better! Rassie van der Dussen joins the party by lofting the spinner for a straight boundary. One hit away.
Alex Hartley
England spinner on BBC Test Match Special
That is a brilliant shot. He just waited.
Need 10 runs from 45 balls
Four more for Bavuma as he deftly edges Nasum Ahmed to the third man boundary.
These last runs are coming thick and fast now and this will give good confidence to Bavuma, too.
Alex Hartley
England spinner on BBC Test Match Special
That is a lovely shot. He just lofted it over the ring fielder.
David Miller liked it. "Yeahhh boy," he shouted from the sidelines.
Need 18 runs from 48 balls
Temba Bavuma says it's time to go as he smashes Soumya Sarkar back over his head for four.