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Van der Dussen top scores for SA with 76
Phehlukwayo supports Van der Dussen with crucial 39
Rashid strikes twice as SA slip to 139-4
Afghanistan post 244 - Azmatullah ends unbeaten on 97 and Coetzee takes four wickets
Afghanistan win the toss & bat in Ahmedabad
South Africa meet Australia in semi-final
Afghanistan need highly improbable margin of victory to overtake New Zealand on net run-rate
Nikesh Rughani
BBC Test Match Special commentator
Oh, again! The second was a lot closer to where Nabi was at slip. Rassie van der Dussen is getting some very, very streaky runs.
Rashid Khan is on his knees. Get the second slip in!
Oh, Rashid Khan must be tearing his hair out!
He draws an edge from Rassie van der Dussen from consecutive deliveries and both times the ball beats the slip and runs away for four.
Markram c Naveen b Khan 25 (SA 116-3)
Well, there's yer wicket!
Aiden Markram tries to turn Rashid Khan into the leg side but the ball takes a top edge and balloons up into the covers. Naveen hurries forward to take the catch and the partnership ends at 50 runs.
Just two singles from Noor Ahmad's over as South African nurdle towards their target.
The second brings up the fifty partnership off 57 deliveries.
They don't need to push especially hard, Afghanistan need wickets to put some pressure on.
Three further singles from Rashid Khan's fourth over, as South Africa continue to tick over slightly ahead of the required rate.
Carlos Brathwaite
Ex-West Indies all-rounder on BBC Test Match Special
I love that. If it's too full, whack it. Sometimes we can see batters too comfortable with hitting it down the ground for an easy single.
Nikesh Rughani
BBC Test Match Special commentator
The fielder at long-on thought he was in business just for a second. It was a lovely pick-up from Van der Dussen.
Kerplunk!
Rassie van der Dussen dispatches Rashid Khan over the mid-wicket boundary for six!
Markram pushes Noor Ahmad down the ground to bring up the South African century, before the South African batters hustle through two as Van der Dussen cuts to the point boundary.
Dirk Nannes
Former Australia bowler on BBC Test Match Special
Rashid Khan is such a dangerous bowler but Van der Dussen and Markram both seem to be picking him pretty well at the moment.
Aiden Markram eases a Rashid Khan ball through the slip region but Mohammad Nabi cuts the ball off the boundary and save a run.
South Africa have run pretty much in lockstep with the required run rate through this innings - they're currently on 4.95 and need 4.88. Steady eddies.
Natalie Germanos
BBC Test Match Special commentator
I wonder if that has slipped out of Noor Ahmad's hand. The dew is starting to settle and that could change things.
The fourth of Afghanistan's spinners arrives as Noor Ahmad is introduced in place of Mujeeb.
There's no chance to ease into his over as Aiden Markram cuts his first ball away for four through backward point.
Rashid Khan maybe fancies a lbw review after rapping Aiden Markram on the pads deep in his crease.
A conference of the fielding side decides against it - rightly so, Markram was backing away and it was easily missing the stumps.
Dirk Nannes
Former Australia bowler on BBC Test Match Special
Again that's Mujeeb just trying to be a little bit too attacking. He bowled five dots and then floated one right up and Markram accepted the challenge.
Natalie Germanos
BBC Test Match Special commentator
Well, that relieves a lot of the pressure. Aiden Makram displaying all of his skill and all of his power.
Aiden Markram faces five dot balls but unleashes on the final ball of the over.
He slaps Mujeeb back down the ground for six!
The players will take drinks in Ahmedabad.
Dirk Nannes
Former Australia bowler on BBC Test Match Special
It doesn't look like an easy wicket to bat on at the moment. There is some turn there for Rashid.
Natalie Germanos
BBC Test Match Special commentator
This is a very interesting passage of play for South Africa. They've lost a couple of wickets and have now got Rashid Khan to contend with.
Afghanistan introduce Rashid Khan into the attack for the first time in this match.
The franchise cricket darling restricts the South African batters to a single apiece.