The game takes another turn. A ball after pulling a Morkel ball for four, Morkel gets instant revenge as the batsman looks to pull another short ball but instead edges the ball on to his own stumps.

Scorecard

Image source, Getty Images

OptaJim:, external 15 - Brendon McCullum's 59 came from 15 scoring shots. Carnage.

Image source, Opta

Suddenly, South Africa look a threat. Philander is back after being taken out of the attack to protect him from McCullum. He beats Guptill with a ball just short of a length outside off. Guptill responds well, though, by whipping a full ball down to the backward square-leg boundary. In al the McCullum madness it was somewhat forgotten that the man at the other end scored 237 not out in his last match.

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"The South Africans know what they have to do. Guptill came into this game under a lot of pressure as people were talking about him before the game and this is a big innings for him and for New Zealand."

Listen to Test Match Special commentary via the audio icon.

Andrew Samson
BBC Test Match Special statistician

"Most sixes in the first 10 overs in this World Cup: 17 by Brendon McCullum, six by Chris Gayle. No-one else has more than three.

"There have been nine fifties scored off 22 or fewer balls in World Cup matches. McCullum has made four of them.

"McCullum has scored 278 of his 328 runs in this World Cup in boundaries (44 x 4, 17 x 6). This is 84.75% of his runs."

Kane Williamson is the new man. His arrival brings a new complexion to the game. McCullum was making this chase look simple, but now the co-hosts will need to reassess and consolidate. Morkel bowls well to the right-hander, who manages just the one run from the remainder of the over.

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"He has definitely set the platform for these guys to churn out what would be an incredible victory. It was just a brilliant knock from McCullum and he has brought the Eden Park crowd on to their feet."

Listen to Test Match Special commentary via the audio icon.

Would you believe it?! It is all going off in Auckland. McCullum plays one big shot too many and he mis-times a pull off Morkel straight to Dale Steyn at mid-on. After the pummelling McCullum gave Steyn a couple of overs ago, it would be fair to say the bowler enjoyed that catch. Eden Park rises to applaud the home skipper off.

Scorecard

Kevin Pietersen
Ex-England batsman on BBC Test Match Special

"The atmosphere here is amazing. What a place to be. We have seen some knocks but this is incredible batting. He has swung from ball one and he is hitting the ball out of the ground.

"Some batters have the skill to walk out there and just swing. He has such a good eye. These are not mis-hits, it is great skill. Wow, wow, wow. The bowler is running in wondering where is the batsman going to go? It is such a party atmosphere. You have guys dancing on the tables."

Listen to Test Match Special commentary via the audio icon.

Having survived the review, Guptill sees out the over for no further runs. NZ are well on top here.

Unbelievable! The review goes through the checklist and it looks like we might be getting an overturn of the on-field man's not out call. But the review of the ball's trajectory shows it is clearing the stumps. Guptill survives and the SA review is gone.

AB de Villiers has to do something to break this up. He opts for his spin option in Imran Tahir and he prompts a review with one that catches Guptill on the arm as he gets down to sweep.

Michael Vaughan
Ex-England captain on BBC Test Match Special

On Twitter:, external This is just brilliant to watch... Wow B.McCullum.... The best captain in the tournament leading the way...

England wicketkeeper Matt Prior adds:, external U just have to love how Brendan McCullum bats.

Dale Steyn is one of the world's best bowlers. And Brendon McCullum has just treated him like he is a Sunday league nobody. Three fours and two sixes (along with a wide) means the over goes for 25. New Zealand are tearing the target apart.

McCullum is simply a machine. Not content with making Steyn look ordinary with that six, he then makes him look a mug by latching on to a short ball to hammer a four before pulling another six over backward point to reach his 50. Off just 22 balls. Stunning.

Simon Mann
BBC Test Match Special

"What a sight it is. Dale Steyn one of the best bowlers in the world is charging in, and Brendon McCullum smashes it straight back over his head."

That is the biggest six of the lot. McCullum comes down the track and launches Steyn high, high, high into the stand behind the bowler. The NZ 50 comes up, off just 25 balls.

Stephan Shemilt
BBC Sport in Auckland

"Ian Smith wanders into the box to give New Zealanders some good news. They actually only need 297 to make the final. A tie sees them through because of their better group placing. South Africa were done by this rule in the famous 1999 semi against Australia."

Graeme Swann
Ex-England spinner on BBC Test Match Special

"The crowd are loving this with New Zealand smashing it about."

Chris Hill: While I'm backing the @BLACKCAPS, will SA be robbed by rain-as they were in 92?

Bhavin Shah: Rain during a South African cricket semi-final down under - demons of 1992 lurking around!