South Africa beat Sri Lanka by nine wickets
S Africa chase 134 in 18 overs: De Kock 78*
Sri Lanka 133: Duminy hat-trick, Tahir 4-26
Quickest chase in World Cup knockout game
First quarter-final, Sydney
SA face New Zealand or W Indies in semi-final
Dale Steyn maintains the pressure at the other end. A maiden for him. Jim says it is a great pitch, but Sri Lanka have only scored three runs off the first three overs.
Jim Maxwell
BBC Test Match Special
"The pitch looks a beauty. The curator has had some criticism for producing pitches which were too slow and difficult to bat on in the evening, but this one is a corker. The outfield is lightning-fast, it should be 300-plus."
Image source, BBC SportIn comes Kumar Sangakkara. The highest run scorer in the tournament so far. But he would not have expected to be in so quickly.
Vic Marks
Ex-England spinner on BBC Test Match Special
"It was quite a big edge, Perera was only defending it, but De Kock dived to his left. It bobbled out of his left hand and he was sharp enough to manage to get his left hand underneath it before it hit the ground. The Perera experiment didn't work."
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Image source, Getty ImagesWe said he looked nervous. Now he is out. The returning Kyle Abbott takes a wicket with his fourth ball. And it is a great catch from the under-pressure Quinton de Kock. The wicketkeeper takes an excellent one-handed catch at the second attempt as he dives in front of first slip. A great start for South Africa.
Image source, Getty ImagesVic Marks
Ex-England spinner on BBC Test Match Special
"I've seen Perera bat before - I've seen him fail, and seen him get runs, but if he does get runs, they will come quickly. Russell Arnold told us he actually used to bat right-handed in his childhood until he switched around."
It's Dale Steyn who has the ball in his hand and he nearly makes an early breakthrough. Kusal Perera slashes at the fourth ball of the over, gets a thick edge but the ball races away for two. A nervous start for the batsman.
Image source, Getty Images
Michael Vaughan
Ex-England captain on BBC Test Match Special
"Your senior core of players like Dale Steyn have to stand up in a game like this."
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An interesting stat from the ICC - these are the bowling averages by different types of bowlers in this World Cup:
21.08 - left-arm seam
33.16 - right-arm seam
39.11 - left-arm spin
48.11 - off-spin
60.10 - leg-spin
The Sri Lanka opening batsmen walk out and are instantly greeted by a huge cheer from their fans. A crowd of about 30,000 is expected in Sydney. Tillakaratne Dilshan and Kusal Perera open the batting. Perera has been moved up the order for this one and will be opening for the first time in the tournament.
Stephan Shemilt
BBC Sport in Sydney
"And on the 33rd day, the ICC created the quarter-finals. 'That's good,' said the ICC. 'We have only eight teams'. Flippancy aside, it feels like this World Cup is really coming alive - Sydney has a big-game atmosphere. Lots of Sri Lanka shirts mulling about the city this morning, shuttle buses from Central Station jam-packed, the ground bathed in sunshine. This is proper."
Image source, Getty Images
Andrew Samson
BBC Test Match Special statistician
"With Tharindu Kaushal playing, Sri Lanka have used 19 players in the World Cup. No other team have ever used more than 17."
Image source, Getty ImagesMusaBavuma: Wishing the boys the best of luck for the hurdle in front of them. #SA nation behind them. #ProteaFire
Rana W U Rehman: So it's do or die at CWC15. Call me mad but Sri Lanka, WI, Pak and India to go through.
No New Zealand. No Australia. No South Africa. Some brave calls from Rana.
Anthem time. The Sri Lankan one goes on for ages, but what a pleasant, happy tune. Surely the most uplifting of the tournament.
Image source, TMSMichael Vaughan
Ex-England captain on BBC Test Match Special
"A massive toss. You look at South Africa throughout this tournament, they couldn't chase against India and Pakistan. I like Sri Lanka, you're never sure what they're going to throw at the opposition so they're difficult to plan against. I think they're one of the toughest teams mentally, and they'll have huge support around the ground."
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South Africa are "not going to choke" against Sri Lanka, according to captain AB de Villiers.
The Proteas have never won a knockout match at the World Cup, a record which includes three painful semi-final exits, including that 1999 farce, external that we just mentioned.
But De Villiers said: "We can't focus on what happened back in the day. We're just going to play a good game of cricket and come out on top. Simple."
Image source, Getty ImagesSpeaking of pressure, that is something that South Africa have not exactly handled in previous World Cups.
Remember 1999? It remains one of the worst moments in South African cricket. Allan Donald's comical / farcical run out left the scores level in their semi-final against Australia.
But Australia progressed into the final because they had finished higher in the Super Six phase earlier in the competition.
Image source, BBC SportThe newest name at the World Cup is Tharindu Kaushal, who will make his one-day international for Sri Lanka in this World Cup quarter-final.
The 22-year-old off-spinner,, external likened to Sri Lanka great Muttiah Muralitharan, was brought into the squad as a replacement for Rangana Herath, who has a cut to his spinning finger and becomes the fifth Sri Lanka player to drop out of the original party.
Born in Galle, Kaushal has only appeared in one international match - the Boxing Day Test against New Zealand in Christchurch, taking 1-159 and 1-48.
Image source, Getty ImagesA duplicate Murali? Nothing like ramping up the pressure on a new player. But what do you know about Sri Lanka's new boy? Let us fill in the details.