David Wiese is in to the attack. It doesn't phase Gulbadin, who carves the bowler's first two balls back over his head for four. The final ball is loose down leg and flicked for another four. 15 from the over. If you are South Africa, when do you start to really worry about this? I'd say right about now.

A good start from Tahir. He gets away with a short ball early on but then tightens his line and length and keeps Afghanistan to just four runs.

Oliver Tapper: Shazhad has played the Jason Roy role for Afghanistan, I fear they don't have a Joe Root in their team though...

Peter Ridgway: Shahzad (aka the Afghan destroyer) is officially my hero. English T20 please, could just see him opening the batting at derby.

This will be interesting. Spinner Imran Tahir is on straight after the powerplay.

Afghanistan have set out their stall. They are going to play one way and that is all-out attack. Gulbadin Naib strides to the wicket and hammers a drive down the ground for four.

Vic Marks
Ex-England spinner on BBC Test Match Special

"Stanikzai is an important wicket. The key thing that Morris is getting is a little bit of extra bounce. He's bowling with aggression and he's getting his rewards."

With Shahzad gone, Kyle Abbott returns. But new man Asghar Stanikzai continues to take the game to the big bowler by slashing a short ball away for six over backward point. The Afghanistan bench looks a happy place to be right now.

John Michael Poole: If South Africa end up blowing this then the 'choker' tag that's been following them round is fully justified in my opinion.

Jonathan Agnew
BBC Test Match Special

"That was royally entertaining. He's like a mixture of Captain Mainwaring and Arjuna Ranatunga, but he's got Afghanistan off to a flyer here."

Jonathan Agnew
BBC Test Match Special

"This is a remarkable innings from Shehzad. He's an old-fashioned batsman. I don't think he spends many waking hours in the gym, he just stands there and flails his bat, but he's got a great eye and tremendous timing."

Vic Marks
Ex-England spinner on BBC Test Match Special

"It is a graveyard for bowlers, and almost the faster you bowl, the worse it is. Rabada doesn't show much emotion, but he must be bewildered at the moment."

Ben Thapa: Afghanistan have to be a chance here. SA bowlers are on the canvas post-England. Keep them there.

Ali has been very much the Robin to Shahzad's Batman in the first two overs, but he finally gets off the mark with a single. The heavy-set Caped Crusader continues his assault with a lovely flick to guide a Rabada ball for four. Pow! And then flicks off his leg for a fine six. Wham!

Vic Marks
Ex-England spinner on BBC Test Match Special

"I'm getting the same vibes as the other night. Suddenly, from nowhere, it's game on."

Jonathan Agnew
BBC Test Match Special

"What an incredible start. Afghanistan are not to be fazed. And if you've taken a hammering in the first game, it doesn't matter who you are, there will be scars from that."

Afg 33-0published at 2 overs

2 overs

This is remarkable. I tell you what, South Africa will be very keen to get rid of Shahzad. He belts another six. A clean hit. And then cuts for four. Faf du Plessis has already got that haunted look in his eyes.

Afg 23-0published at 1.3 overs

1.3 overs

And another. This time over mid-on. He doesn't move much Shahzad. He doesn't have to.