Bangladesh bowled out for 233 to lose by 149 runs
Mahmudullah makes excellent 111 off as many balls to defy South Africa
South Africa post imposing 382-5 after late flurry
De Kock hits sublime 174 off 140 balls - highest score in tournament
Klaasen smacks 90 off 49, Markram adds 60 off 69 & Miller cracks 34* off 15
Proteas move up to second in the table, Tigers now bottom
De Kock 90, Markram 59
Quinton de Kock finds the boundary again as Mustafizur Rahman drops short and the left-hander just helps it to the square-leg boundary.
There's a brief appeal for lbw against the opener too but it was sliding down the leg side and Shakib doesn't even entertain the thought of a review.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
Floated up, Markram swung the bat. It was in the air but it went past the fielder at the rate of knots.
Shakib Al Hasan is struggling to offer the control and tight economy rate that he normally does.
Quinton de Kock reverse sweeps for four, before Aiden Markram drills through the covers.
South Africa are starting to find the boundary with more regularity.
Aiden Markram looks very good too, Finny.
Steven Finn
Former England bowler on BBC Test Match Special
Quinton de Kock is looking very good. He hasn't offered up any chances so far and already has two hundreds in this World Cup.
He looks dead set on making this start count as well.
De Kock 78, Markram 54
A change of pace for Bangladesh as left-arm seamer Mustafizur Rahman comes back on.
South Africa seem happy to take a look for now with four singles and a wide from the over.
They will be eyeing 300-plus again.
Prakash Wakankar
BBC Test Match Special commentator
Lovely delivery. The first one that has gripped and turned - and at pace from Shakib Al Hasan.
Oh. Encouragement for Shakib Al Hasan and Bangladesh.
He finds a little bit of grip and bounce to get one to rise on Aiden Markram.
The stand-in Proteas skipper is able to drop his hands and bat though.
Prakash Wakankar
BBC Test Match Special commentator
Beautiful extra cover drive.
SA 141-2
Another change for Bangladesh as Mehidy Hasan returns for his eighth over.
He's greeted by a gorgeous cover drive from Aiden Markram which races past mid-off and away to the fence.
The over ends with another four as Markram guides through point to bring up his half-century.
The century partnership came up earlier in the over too. Ominous for Bangladesh.
This shot? Superb.
Quinton de Kock is a serious player.
Shakib Al Hasan knows his side need a wicket because this partnership is now extremely dangerous and is laying a significant platform for Heinrich Klaasen, David Miller and Marco Jansen.
No breakthrough for Bangladesh in this over though, with five runs off the set.
Steven Finn
Former England bowler on BBC Test Match Special
Even when the ball is bowled slower, the spin does seem to be skidding on and not really gripping.
The danger for Bangladesh is that if they let these next 10 overs drift, it turns into a slog-a-thon later in the innings.
Prakash Wakankar
BBC Test Match Special commentator
Markram waited on it and slapped it away for four.
There's a bad ball.
Mahmudullah offers Aiden Markram some length and a smidgen of width and it gets crushed away to the cover boundary.
A good over for South Africa, 10 from it.
Prakash Wakankar
BBC Test Match Special commentator
South Africa appear to be content, for now at least, to take the ones and twos, and wait for the loose balls.
A good over from Nasum Ahmed, conceding just three singles.
Quinton de Kock throws back his head in disappointment to end the over as he misses out on a leg-stump half-volley by picking out short fine leg.
That probably should have been punished.
Athar Ali Khan
Former Bangladesh all-rounder on BBC Test Match Special
De Kock is in such good nick. He's enjoying himself and everything is coming out of the middle of the bat.
Prakash Wakankar
BBC Test Match Special commentator
Absolutely marvellous stroke.
My days. Shot.
Quinton de Kock premeditates a reverse sweep/slap and absolutely pulverises it over the rope for six.
There was little risk in the shot with both short third and point up in the ring so he knew if he got enough contact on it he was picking up a boundary.