And they have won it at a canter, completing their round-robin stage with a comprehensive 75-run victory over Bangladesh. Even dodgy floodlights couldn't stop them.
Can anyone else? England may be their first to have a crack if they beat Sri Lanka in Delhi today and, potentially, go though in second position in Group 1.Â
We don't have to wait long to find out with the match in Delhi due to start at 14:00 GMT. Stephan Shemilt will be along to bring you our live text and in-play highlights coverage in about 10 minutes.Â
Make sure you join him and thanks for joining us. Cheerio.
Post update
Sussex excited by the signing Mustafizur
Post update
More from Kiwi skipper Kane Williamson: "Every game is tough and in the fickle nature of T20 cricket it is sometimes hard to work out but we are going to keep improving as a team and see how far we can get."
Post update
New Zealand skipper Kane Williamson: "We've done a lot of travel but the boys have been great. The bowling was very clinical again."
Post update
New Zealand skipper Kane Williamson on Bangladesh's Mustafizur Rahman: "Brilliant, especially on these wickets, I thought he bowled very smartly and deserved his five-for."
Post update
Bangladesh captain Mashrafe Mortaza: "If the total we chased was 10 or 15 runs shorter then maybe the batter's mindset would have been different. We can take positives out of this, like Mustafizur Rahman (who took 5-22).
"His cutter is very difficult. Our batters struggle in the nets against them. Hopefully he'll give 10 more years for Bangladesh and it will be a different story.
"New Zealand have always been tough and it's no surprise to see them in the semis."
Get Involved - #bbccricket
Are New Zealand going to win the whole thing? Let us know your thoughts...
Abu Ali:Â The India result was devastating. But sad to see the Bangladesh team just fade today. At least try to go out with a win!
Pete Naylor:Â Honestly think New Zealand will win the World T20 this year. Superbly balanced side...
John Michael Poole:Â New Zealand have got this World Cup in the bag. They are better than India in Indian conditions. Madness.Â
New Zealand win by 75 runs
Man of the match Kane Williamson (who scored 42): "It was a pretty tough surface. It spun a bit and kept low. Batting in the front six overs was nice, then it got tougher.
"It was a good batting effort all round. We put partnerships together and some guys played little cameos.
"Going into each game we look to read the wicket and opposition as best we can. It's worked so far."
APCopyright: AP
New Zealand win by 75 runs
Grant Elliott (3-12 from 4 overs) and Ish Sodhi (3-21 from 3.4 overs) picked up six of the wickets between them. Bangladesh only managed five boundaries and three of them came in the fifth over. They were never in that chase.
New Zealand are confirmed as winners of Group 2. If England beat Sri Lanka later they are likely to be their opponents in the last four.
WICKET - New Zealand win by 75 runs
Al-Amin b Sodhi 0 (Bang 70 all out)
Another Ish Sodhi googly puts Bangladesh out of their misery as Al-Amin Hossain is the latest to completely miss the wrong 'un. Four wins out of four for New Zealand completes a seriously impressive group stage for the Kiwis.
WICKET
Mustafizur c Ronchi b Elliott 6 (Bang 65-9)
No doubt about this one. Mustafizur, who bowled so brilliantly to claim 5-22 earlier, launches the first six of the innings but then gets an inside edge into the gloves of Luke Ronchi. Bangladesh's lowest ever T20 score is 78 - also against New Zealand. They're threatening to beat it here. Elliott finishes with 3-12.
WICKET
Mashrafe lbw Elliott 3 (Bang 59-8)
Grant Elliott traps Mashrafe but he's lucky with this one. His knuckle ball was sliding down leg. Not that it matters to the overall outcome.
Bang 58-7 (need 146 to win)
Shuvagata has had enough and advances to Sodhi - a faint inside edge enough to take it away from wicketkeeper Luke Ronchi.Â
Bang 50-7 (need 146 to win)
Grant Elliott concedes just the two from his third over and has figures of 1-5 after three overs. Mashrafe Mortaza in now. New Zealand look comfortably the best team in this tournament so far.Â
WICKET
Mahmudullah b Sodhi 5 (Bang 48-7)
Mohammad Mahmudullah is almost done for by an Ish Sodhi googly but manages to escape... not so lucky the next time he faces though. Straight through the gate and on to the top of off stump. A procession.
And we have light!
Bang 45-6
We're back under way... Ish Sodhi to bowl after an 11-minute delay.
Floodlight failure
Bang 45-6 (need 146 to win)
Hurrah! The emergency generator has kicked in and we now have full light in Kolkata. The players are back out and a resumption is imminent.
Floodlight failure
Bang 45-6 (need 146 to win)
There are some bulbs shining on that floodlight tower now but not yet all of them...Â
Australia women beat Ireland women
Adam Mountford
BBC Test Match Special producer in Delhi
So Australia win by seven wickets with 40 balls to spare.
They will definitely be through if New Zealand beat South Africa tonight and would play their semi-final here in Delhi on Wednesday.
If that is the case then Australia will start as favourites whoever they play after two games already in the Delhi conditions while other sides have been travelling across India.Â
The most likely semi-final will be against England who can seal their group with victory over Pakistan in Chennai tomorrow.
Live Reporting
Alan Jewell and Jamie Lillywhite
All times stated are UK
Get involved
APCopyright: AP 
Latest PostNew Zealand confirmed as Group 2 winners
And they have won it at a canter, completing their round-robin stage with a comprehensive 75-run victory over Bangladesh. Even dodgy floodlights couldn't stop them.
Can anyone else? England may be their first to have a crack if they beat Sri Lanka in Delhi today and, potentially, go though in second position in Group 1.Â
We don't have to wait long to find out with the match in Delhi due to start at 14:00 GMT. Stephan Shemilt will be along to bring you our live text and in-play highlights coverage in about 10 minutes.Â
Make sure you join him and thanks for joining us. Cheerio.
Post update
Sussex excited by the signing Mustafizur
Post update
More from Kiwi skipper Kane Williamson: "Every game is tough and in the fickle nature of T20 cricket it is sometimes hard to work out but we are going to keep improving as a team and see how far we can get."
Post update
New Zealand skipper Kane Williamson: "We've done a lot of travel but the boys have been great. The bowling was very clinical again."
Post update
New Zealand skipper Kane Williamson on Bangladesh's Mustafizur Rahman: "Brilliant, especially on these wickets, I thought he bowled very smartly and deserved his five-for."
Post update
Bangladesh captain Mashrafe Mortaza: "If the total we chased was 10 or 15 runs shorter then maybe the batter's mindset would have been different. We can take positives out of this, like Mustafizur Rahman (who took 5-22).
"His cutter is very difficult. Our batters struggle in the nets against them. Hopefully he'll give 10 more years for Bangladesh and it will be a different story.
"New Zealand have always been tough and it's no surprise to see them in the semis."
Get Involved - #bbccricket
Are New Zealand going to win the whole thing? Let us know your thoughts...
Abu Ali:Â The India result was devastating. But sad to see the Bangladesh team just fade today. At least try to go out with a win!
Pete Naylor:Â Honestly think New Zealand will win the World T20 this year. Superbly balanced side...
John Michael Poole:Â New Zealand have got this World Cup in the bag. They are better than India in Indian conditions. Madness.Â
New Zealand win by 75 runs
Man of the match Kane Williamson (who scored 42): "It was a pretty tough surface. It spun a bit and kept low. Batting in the front six overs was nice, then it got tougher.
"It was a good batting effort all round. We put partnerships together and some guys played little cameos.
"Going into each game we look to read the wicket and opposition as best we can. It's worked so far."
New Zealand win by 75 runs
Grant Elliott (3-12 from 4 overs) and Ish Sodhi (3-21 from 3.4 overs) picked up six of the wickets between them. Bangladesh only managed five boundaries and three of them came in the fifth over. They were never in that chase.
New Zealand are confirmed as winners of Group 2. If England beat Sri Lanka later they are likely to be their opponents in the last four.
WICKET - New Zealand win by 75 runs
Al-Amin b Sodhi 0 (Bang 70 all out)
Another Ish Sodhi googly puts Bangladesh out of their misery as Al-Amin Hossain is the latest to completely miss the wrong 'un. Four wins out of four for New Zealand completes a seriously impressive group stage for the Kiwis.
WICKET
Mustafizur c Ronchi b Elliott 6 (Bang 65-9)
No doubt about this one. Mustafizur, who bowled so brilliantly to claim 5-22 earlier, launches the first six of the innings but then gets an inside edge into the gloves of Luke Ronchi. Bangladesh's lowest ever T20 score is 78 - also against New Zealand. They're threatening to beat it here. Elliott finishes with 3-12.
WICKET
Mashrafe lbw Elliott 3 (Bang 59-8)
Grant Elliott traps Mashrafe but he's lucky with this one. His knuckle ball was sliding down leg. Not that it matters to the overall outcome.
Bang 58-7 (need 146 to win)
Shuvagata has had enough and advances to Sodhi - a faint inside edge enough to take it away from wicketkeeper Luke Ronchi.Â
Bang 50-7 (need 146 to win)
Grant Elliott concedes just the two from his third over and has figures of 1-5 after three overs. Mashrafe Mortaza in now. New Zealand look comfortably the best team in this tournament so far.Â
WICKET
Mahmudullah b Sodhi 5 (Bang 48-7)
Mohammad Mahmudullah is almost done for by an Ish Sodhi googly but manages to escape... not so lucky the next time he faces though. Straight through the gate and on to the top of off stump. A procession.
And we have light!
Bang 45-6
We're back under way... Ish Sodhi to bowl after an 11-minute delay.
Floodlight failure
Bang 45-6 (need 146 to win)
Hurrah! The emergency generator has kicked in and we now have full light in Kolkata. The players are back out and a resumption is imminent.
Floodlight failure
Bang 45-6 (need 146 to win)
There are some bulbs shining on that floodlight tower now but not yet all of them...Â
Australia women beat Ireland women
Adam Mountford
BBC Test Match Special producer in Delhi
So Australia win by seven wickets with 40 balls to spare.
They will definitely be through if New Zealand beat South Africa tonight and would play their semi-final here in Delhi on Wednesday.
If that is the case then Australia will start as favourites whoever they play after two games already in the Delhi conditions while other sides have been travelling across India.Â
The most likely semi-final will be against England who can seal their group with victory over Pakistan in Chennai tomorrow.