The thickset Hazratullah, tiring of being squared up by Rabada's accurate line, takes the long handle approach to the paceman and hoists it away rather agriculturally into the leg side for two.
The left-arm seamer Beuran Hendricks, playing only his third ODI, takes up the attack from Cathedral End. A probing over to Noor Ali and the opener has to rock his head back to avoid a bouncer, which is timed at 82mph but looks a lot quicker.Copyright: AFP
Some problems early on for the left-handed Hazratullah against Rabada at 88mph but the final ball is a full toss and clipped off his pads for the first boundary of the match.
Ex-New Zealand captain on BBC Test Match Special
Rabada will need to be used very carefully - Steyn has gone, Ngidi is injured. South Africa will have to look after their fast bowlers from now on!
Rabada takes a tumble in his follow-through with the second ball of the match and the trusty sawdust is called for. I always enjoy the way the crease is marked in rather rudimentary fashion with a finger through the middle of it.Copyright: AFP
Sadly no Mohammad Shahzad for Afghanistan today, the opening batsman ruled out of the rest of the tournament with a knee injury. I enjoyed his unorthodox wicketkeeping style, but he only made seven runs in his two innings with the bat at the top of the order and it will be Noor Ali Zadran and Hazratullah Zazai to face the pace of Kagiso Rabada.Copyright: Reuters
Bright sunshine and just a light breeze from the Taff as the teams converge in the centre for the anthems.
Ex-New Zealand captain on BBC Test Match Special
South Africa, being the third-ranked side, will be disappointed by their position so far and they need to correct things as soon as possible.
It's a greenish pitch, one side of the ground is shorter than the other and the wind is blowing that way as well.
South Africa have had some bad luck, but there has been a lack of skill and a lack of decision making. The pressure of results has got to the team - there is joylessness in the side. They must win this game and they must win it well.
Former South Africa all-rounder Shaun Pollock would probably do well on this wicket but he says in his TV pitch report that it is soft with plenty of grass on it. He is not expecting it to be particularly helpful to the quicks, so we shall say.
A few technical issues have been resolved and I have graciously refused a garlic olive - because they are, let's face it, an abomination - and we await the teams. There are few greenish tinges in the wicket, with that inviting, herringbone tweed look to the surface.
For Afghanistan, Asghar Afghan returns in place of Najibullah.
Afghanistan: Hazratullah Zazai, Noor Ali Zadran, Rahmat Shah, Hashratullah Shahidi, Gulbadin Naib (capt), Asghar Afghan, Mohammad Nabi, Ikram Alikhil (wk), Rashid Khan, 10 Aftab Alam, Hamid Hassan.
South Africa: Quinton de Kock (wk), Hashim Amla, Aiden Markram, Faf du Plessis (capt), Rassie van der Dussen, David Miller, Andile Phehlukwayo, Chris Morris, Kagiso Rabada, Beuran Hendricks, Imran Tahir.
Afghanistan captain Gulbadin Naib: "We would have had a bowl as well but we have had a good four days of practice here."
South Africa captain Faf du Plessis: "Chasing when there is rain around generally gives you a better indication of what to do. We haven't played hardly any cricket so there is no need to make any changes.
"We've had a lot of rain which hasn't been ideal but we've had some good team chats."
Faf du Plessis wins the toss and opts to pit his bowlers against the Afghanistan top order.
This will be a short one, because it's the first meeting between these two teams at one-day international level. There have been just two T20s previously, both won convincingly by the South Africans.
Plenty of blue sky around and not the gusting winds we saw for the England match against Bangladesh and we're all set for the toss.
Now we should be ok with the weather today. There have been two matches abandoned not far away in Bristol already in the tournament, but judging from the forecast we should get a winner today.Copyright: BBC
Defeats against England, Bangladesh and India for South Africa thus far then, with just the one point accrued from a washed out game against West Indies at Southampton.
Dale Steyn is out of the tournament too of course, but the Proteas will cling to the hope that Pakistan lost three matches in 1992 - and went on to win the tournament.Copyright: Getty Images
We might have predicted one of the teams in a contest between the bottom two, but surely not their opponents to be four-times semi-finalists.
That's the position as we welcome you to our coverage of a day-night match between South Africa and Afghanistan from Cardiff in the World Cup.
Hello again. No-one likes to finish last do they? And we're still trying to get over the Eurovision Song Contest.Copyright: Getty Images