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
Gerald Coetzee strays off line and gives Mahmudullah the chance to clip another shot off his pads for four.
Mahmudullah is 28 from 44 balls. He has three ODI centuries to his name so knows how to bat. But it all feels a bit forlorn right now.
Here is how Mehidy Hasan departed, sweeping straight to the fielder on the rope.
Just the single off Keshav Maharaj's latest over, meaning Bangladesh are 293 runs behind.
The heaviest World Cup defeat in terms of runs is 275.
Steven Finn
Former England bowler on BBC Test Match Special
Yeah, they might just start playing it as they arrive home on the plane.
Prakash Wakankar
BBC Test Match Special commentator
By that calculation, England might be playing their best cricket in three weeks' time.
Steven Finn
Former England bowler on BBC Test Match Special
It looks ominous for South Africa at the moment. It is almost too good from them.
You don't want to play your perfect cricket now. You want to do that in three weeks' time.
Lizaad Williams drifts on to leg stump allowing Mahmudullah to clip off his pads fine and down to the rope for four.
Mahmudullah moves on to 23 from 34 deliveries.
Prakash Wakankar
BBC Test Match Special commentator
It was a comfortable catch. Bangladesh will want to forget this night quickly.
Steven Finn
Former England bowler on BBC Test Match Special
There was an air of inevitability about that. It was just getting thrown higher and higher by Maharaj.
Mehidy c sub (Phehlukwayo) b Maharaj 11 (Ban 81-6)
Keshav Maharaj strikes.
The spinner gives it some air to lure Mehidy Hasan into the slog-sweep, but he can only pick out sub fielder Andile Phehlukwayo, who takes another catch on the square leg boundary.
A boundary! For the first time since the 14th over.
It is a nice shot as well, guided off the pads by Mehidy Hasan and through mid-wicket to the rope.
Bangladesh run a couple of singles off Keshav Maharaj, plus a wide, as this match continues to trundle along.
It is not exactly a thriller I have to admit.
Kagiso Rabada is given a rest as Lizaad Williams returns.
Mehidy survives - it was pitching outside leg.
Good review in the end.
Steven Finn
Former England bowler on BBC Test Match Special
This drifts in towards the leg stump. It's definitely hitting the stumps.
It's gripped and turned to beat the outside edge. The question is whether it pitched on leg stump or just outside.
Prakash Wakankar
BBC Test Match Special commentator
The umpire had a long look at that but I thought that the ball spun and might have struck him on the back leg.
Now then. Keshav Maharaj gets one to grip and turn, brushing Mehidy Hasan's front pad before hitting his back pad.
The umpire's finger goes up, but Mehidy reviews.
Bangladesh are just dealing in singles at the moment. It is more than five overs since we last saw a boundary.
Firdose Moonda
Cricinfo writer on BBC Test Match Special
I don't think South Africa will be too concerned by the net run-rate but they'll still want to bowl Bangladesh out as quickly as possible to improve it as much as possible.
Prakash Wakankar
BBC Test Match Special commentator
This is going nowhere for Bangladesh.
Keshav Maharaj races through another over, with just single off it. The innings is grinding to a halt.