Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"It was as out as it gets. A shame for the lad. He gets thrown in after someone else had got injured and does not score. But how often does it happen, where a youngster comes in and is immediately out?

Not quite the situation you'd want to come in and bat on your ODI debut - but that's exactly what faces young Tharindu Kaushal. With a slip and a silly point in, he's hit on the pad first ball... and that's absolutely plumb. Missing a straight one. Oh dear. And the delighted JP Duminy has taken a hat-trick as he got a wicket off the last ball of the previous over. I'm not sure the crowd have realised.

Scorecard

Image source, Getty Images

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"Where do Sri Lanka go from here? Kumar Sangakkara has to become the striker now."

Listen to Test Match Special commentary via the audio icon.

Now there's a collector's item. Kulasekara prods forward to Duminy, South Africa appeal for a catch to the keeper - and Kulasekara walks, without waiting for the umpire's finger to rise.

Scorecard

Image source, Getty Images

Nuwan Kulasekara is the new batsman - Sri Lanka are now really into the realm of bowlers who bat, rather than all-rounders. He's off the mark first ball as he pushes a single through mid-wicket - in contrast, Sangakkara can only hit it straight to a fielder.

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"South Africa have been amazing in the field today. They're the sort of catches you love at first slip."

It's clearly Imran Tahir's day - new batsman Thisara Perera edges to slip via the keeper's gloves, he's gone for a duck and Tahir is off on his travels again, charging away in celebration.

Scorecard

Image source, Reuters

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"Mathews was caught in between two worlds thinking 'should I stay or should I go'. Almost certainly when you get caught between two worlds you mess it up. It was a half-hearted shot. It's normally an easy shot for him, one he would normally hit for six.

"I don't think Sri Lanka will get to 250 and they need at least 280."

Listen to Test Match Special commentary via the audio icon.

Just when Sri Lanka are starting to pick up the ones and twos with ease, Mathews comes down the pitch to Duminy and hits it to mid-on where Du Plessis reaches to his left and plucks it out of the air. Five down, and there's now so much resting on Sangakkara - who has 33 from 86 balls.

Scorecard

Image source, Getty Images

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"Sangakkara is just standing at one end thinking he will have to bat the 50 overs. If Sri Lanka are to get a respectable total he will have to bat all the way through. Sri Lanka think they can defend any total South Africa make."

Image source, BBC Sport

Mathews belatedly gets one through the covers for a single, but South Africa, an excellent fielding side, really have Sri Lanka on the rack here as Sangakkara can still only plod along in singles. Stand by on TMS - it's Aggers joined by Kevin Pietersen.

Image source, Getty Images

Huge shout for lbw from Steyn, who gets down on both knees to beseech umpire Nigel Llong for a leg-before decision against Mathews - but Steyn is met with a stony stare worthy of his umpiring compatriot (now retired) Rudi Koertzen - and the ball-tracker shows the ball sailing over the stumps. Mathews seems paralysed here, back on the crease and unable to get Steyn away.

Image source, AP

Michael Vaughan
Ex-England captain on BBC Test Match Special

"Sri Lanka have to explode into life somewhere soon. Mid-wicket looks open and it is quite short to that side. The problem for Sri Lanka is that South Africa have had the best strike rate in the last 10 overs, but also have the best economy rate with their bowlers in their last 10 overs."

Listen to Test Match Special commentary via the audio icon.

Now, South Africa still have four "fifth bowler" overs to smuggle through at some point - and they have a chance to get two or three in before the batting powerplay is taken, so turn back to JP Duminy's part-time off-spin. (Stay tuned on TMS for another part-time international off-spinner, born in South Africa, who will be on summarising duty soon).

For now, at least, it's the right decision as he keeps Sangakkara and Mathews bottled up - just a single apiece from the over. Sanga has 30 from 80 balls.

Image source, Getty Images

Sri Lanka 105-4 (30 overs)

Batsmen: Sangakkara 29*, Mathews 14*

Fall of wickets: 3-1 (K Perera 3), 4-2 (Dilshan 0), 69-3 (Thirimanne 41), 81-4 (Jayawardene 4)

Bowling figures: Steyn 6-2-16-1, Abbott 5-1-16-1, Morkel 6-1-21-0, Duminy 6-0-22-0, Tahir 7-0-24-2.

Sri Lanka won toss

Scorecard

There's no let-up here against the Proteas pace attack - you see off Morne Morkel, and then you get the fearsome Dale Steyn charging in like a wild man from the other end. Sangakkara tips-and-runs a quick single, now, will Mathews get some more chin music here? He pulls a short ball for one, and the left-handed Sangakkara keeps the same fielder busy with one through the covers. Three from the over.

Captain AB de Villiers moves his slip to leg slip - there's also a shortish square leg catching, and Mathews fends off another short ball which he squeezes just wide of Roussow in that very position as they run one. Sangakkara rotates the strike, while Mathews does his best to fend off the rest of a very hostile over.

Image source, AP

Michael Vaughan
Ex-England captain on BBC Test Match Special

"Sri Lanka have to get at least 240 against a strong South Africa batting line-up that goes so deep. There have been huge scores in the World Cup, but we will not be seeing scores of 350+ any more against these kind of attacks."

That was near the knuckle, both literally and metaphorically. Mathews has his finger taped by the physio - he's also sporting one of those ancient armguards, as favoured by Chris Rogers amongst others, which looks like it could fall to bits at any moment. He's OK to continue.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"He just tried to duck the ball, but it has not got up. He has hung his hands out and got hit."

Listen to Test Match Special commentary via the audio icon.