Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"If South Africa debrief after the game, they will have all the boxes ticked. They have not let Sri Lanka play cricket today.

"The way they started at Sangakkara, to have him five off 30 balls, that does not mean he has batted badly. It means South Africa have bowled beautifully."

Jonathan Agnew
BBC Test Match Special

"This must be the dampest of squibs we have ever had in a World Cup quarter-final, if you look at it in terms of numbers."

Chameera gets the hook after two rather forgettable overs, and fellow right-arm seamer Thisara Perera is on as Sri Lanka's sixth bowler, looking to make amends for his third-ball duck. But it's business as usual for South Africa as left-hander De Kock brutally pulls him for four from outside off stump, then lofts one over deep mid-wicket... and is dropped by the diving Kusal Perera as the ball trickles over the boundary. Sri Lanka must want this to end now, as a wide advances the score - only 24 more needed, and at the rate they're going, they could do it in the next couple of overs.

Image source, Reuters

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"Quinton de Kock has that little innocence of youth and a nice touch about him. I asked him where he had been this World Cup and he said: 'I turn up when it counts!'"

Listen to Test Match Special commentary via the audio icon.

De Kock forges ahead, South Africa move remorselessly into three figures. The second fifty has only taken them 31 balls (compared to 55 for the first 50).

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"There is a huge amount of pressure put on South Africa, as JP Duminy and Dale Steyn said in their pre-match interviews, and to get rid of this choking tag they think they are going to have to win the World Cup."

South Africa 96-1 (13 overs) - target 134

Batsmen: De Kock 50*, Du Plessis 13*

Fall of wickets: 40-1 (Amla 16)

Bowling figures: Malinga 5-0-32-1, Dilshan 1-0-2-0, Kulasekera 1-0-13-0, Kaushal 4-0-16-0, Chameera 2-0-29-0

Sri Lanka 133 (37.2 overs): Sangakkara 45; Tahir 4-26, Duminy 3-29.

Sri Lanka won toss

Scorecard

That's a confident half-century from De Kock, who started the day taking a great catch behind the stumps and now has his first fifty of the tournament.

Chameera is doing his best, but this has been a pretty horrid spell from him. Even the fielding gets a bit scrappy as the Proteas take another couple of singles... oh dear, then there's another legside wide. He has 0-29 from two overs.

Image source, Getty Images

Who do you think will win the World Cup?

Vote on the top right-hand side of the page or under the 'Vote' tab on mobile devices.

The vote will close at 09:00 GMT with results published here shortly after. Read the terms and conditions here.

The batsmen get a quick drink and change of gloves between overs from Aaron Phangiso, the spinner who's been carrying the drinks for the entire World Cup - he's their only squad member who hasn't got a game, and looks unlikely to unless they get a lot of injuries.

Chameera is taking some punishment here, De Kock steering his first ball for four, before the seamer bangs in an awful legside wide - a legside Harmison ball, if you were - which gives keeper Sangakkara no chance and disappears for five wides. Undaunted, the paceman tries a bouncer which De Kock attempts to pull and it goes for four leg byes - via his helmet.

Stephan Shemilt
BBC Sport in Sydney

"'He's good, this kid,' says Michael Vaughan of Kaushal. 'He'll be bowling England out sometime soon'."

Aggers and KP are reunited on TMS as young Kaushal spins down his fourth over, there's a brief "ooh" from the crowd as De Kock prods forward and the ball spoons up towards mid-wicket but well short of a fielder. The debutant also has Du Plessis playing and missing - and in terms of economy he's doing pretty well, just two singles from the over. He has 0-16 from four.

This over is a total mixed bag - boundaries, wides, no-balls... The tall Chameera has De Kock playing and missing at a yorker-length delivery just outside off stump, but then he's charged with a wide trying to test him down the leg side. Du Plessis helps himself to a two, and, after an aerial wide, the right-hander helps a single to third man. 16 from Chameera's over.

Image source, AFP

After five wicketless Malinga overs, Sri Lanka turn to right-arm seamer Dushmantha Chameera - whose international experience so far extends to taking 2-60 from eight overs against New Zealand, and 3-51 from 7.1 against Scotland. He runs in from the Randwick End, but De Kock is going well here, drilling a four wide of mid-off and thumping another through mid-wicket (off yet another no-ball, to boot). South Africa are more than halfway to their target already.

Image source, Reuters

Vic Marks
Ex-England spinner on BBC Test Match Special

"We are almost seeing the future of Sri Lanka cricket, and in the most trying of circumstances. Kaushal bowled quite well, and Chameera, though he has barely played, bowled quite quickly against Scotland."

Listen to Test Match Special commentary via the audio icon.

Kaushal has rather been thrown into the lions' den here - meanwhile, South Africa will welcome the opportunity for their off-form opener De Kock to play himself back into form in time for the semi-finals, while Du Plessis - who missed the last game with a back injury - also gets some much-needed middle practice. The Proteas plunder some ones and twos, while De Kock slaps another four square of the wicket - he has 34 from 29 balls. Powerplay concluded.

Finally, Malinga gets through the over. Just 81 more needed... from 41 overs.

Meanwhile, the old firm of Kumar Sangakkara and Mahela Jayawardene - standing at wicketkeeper and slip respectively - look as though they know the game's up and this will be their ODI swansong today at the SCG.

Du Plessis, quick between the wickets, steers Malinga for two, while the Slinger looks to tempt him with a ring of six fielders crowding the off side. A single takes him to four, De Kock pulls another no-ball over mid-on for three. The free-hit ball... is a wide, so they get another free-hit. It never rains, but it pours...

Jim Maxwell
BBC Test Match Special

"Watch how the ball comes out of Kaushal's hand. The release is fascinating - it doesn't come out of the front of the hand. He goes over the ball somehow."

Young debutant Tharindu Kaushal gets a second over, going round the wicket again and skipping between the umpire and the stumps. Du Plessis, standing tall, guides a single off his legs. South Africa play him with all the caution they might for any other 22-year-old who they've never seen bowl before.

Image source, Reuters