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
Miller 2, Klaasen 79
Dopey fielding from Bangladesh allows Heinrich Klaasen to get back for two from the last ball of the over.
That might not be the worst thing for Bangladesh, though, as it keeps the set batter off strike.
Firdose Moonda
Cricinfo writer on BBC Test Match Special
It is starting to look like the South Africa juggernaut cannot be stopped.
Double hundred watch is over with Quinton de Kock gone but Heinrich Klaasen might have his eyes on another ton!
He continues to hand out the punishment to Mustafizur with another towering six to move to 77 from 42 balls.
Prakash Wakankar
BBC Test Match Special commentator
The South African run machine is in fifth gear.
Watch out in the crowd, Heinrich Klaasen is at it again!
Low full toss from Mustafizur Rahman and it is bludgeoned over the leg side, just shy of the second tier.
South Africa are going to cruise past 350.
In the slot from Hasan Mahmud and Heinrich Klaasen just clears his front leg and wallops the ball back over his head for a maximum.
No let up from South Africa. No surprise there.
Brief respite for Bangladesh as Quinton de Kock drags himself from the field.
Coming out to replace him is David Miller so that respite is likely only to be very brief...
Jonathan Agnew
BBC cricket correspondent on Test Match Special
What an incredible innings and what entertainment South Africa have given us at this World Cup so far. Their batting has been sensational.
De Kock c Nasum b Mahmud 174 (SA 309-4)
The end of a phenomenal innings from Quinton de Kock.
It's a full toss wide of off from Hasan Mahmud, De Kock tries to open the face and lift the ball over deep backward point for six.
However, despite a decent connection, there isn't quite enough on it and Nasum Ahmed takes a straightforward catch on boundary.
Expect plenty more like this in the next five overs...
In the context of the last few overs, this is a superb over from Mustafizur Rahman.
It goes for nine.
A good comeback from the left-arm seamer after Quinton de Kock whipped the first ball away for four.
Steven Finn
Former England bowler on BBC Test Match Special
He is not even showing any signs of fatigue either.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
The onslaught continues. De Kock could get to 200 from here.
Quinton de Kock is up to 11th on the all-time individual highest score at a World Cup list. Here's the top five:
If he reaches a double century it would be South Africa's first in ODIs.
Quinton de Kock's single takes South Africa to 300.
The talk was off 350 a few overs ago, 400 isn't beyond the realms of possibility now.
That will put my fingers to the test given the pace at which I'm already having to type - I can barely keep up with all these boundaries!
Jonathan Agnew
BBC cricket correspondent on Test Match Special
South Africa could score anything from here.
SA 299-3
Bad news, Bangladesh fans, it's not just Quinton de Kock swinging for the hills now.
Heinrich Klaasen gets in on the act with a mighty six over the leg side and brings up a 34-ball fifty with a single next ball.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
If I was Shoriful I would call for a suit of armour for the next delivery because that shot nearly took his head off.
Just fantastic batting from Quinton de Kock!
He opens the face of the bat at the last moment to guide the first ball of the over past short third for four before drilling the next back past Shoriful Islam for four more.
That went like a tracer bullet!
This is now the highest individual score at this World Cup.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
Heinrich Klaasen is rather playing second fiddle at the moment.