New Zealand beat Bangladesh by eight wickets to maintain 100% start
Williamson retires hurt on 78 after blow to thumb in first match after seven months out with knee injury
Mitchell hits superb 89 not out off 67 balls as NZ win with 7.1 overs to spare
Bangladesh post 245-9 after Mushfiqur hits 66 off 75
Ferguson takes 3-49, while Boult & Henry strike twice each
Mahmudullah turns down a couple of singles early in the over.
Even if he doesn't trust Mustafizur Rahman, I can't help but feel Bangladesh need every run they can get at the moment.
Just two come from Trent Boult's latest set.
Trent Boult is coming back on to bowl a couple of overs at the death.
Here is the New Zealand left-armer taking his 200th ODI wicket by dismissing Towhid Hridoy earlier today...
Stephan Shemilt
BBC Sport chief cricket writer
The only criticism of New Zealand's performance in the field is the no-balls. They've bowled four of them.
A Bangladesh fan with the full tiger face paint has just been shown on the TV and he looks completely miserable.
This has been a forgettable innings for Bangladesh. Even when Matt Henry oversteps for a no-ball and a free hit, Mahmudullah can only pull it for a single.
Four overs to go.
Michael Vaughan
Former England captain on BBC Test Match Special
If there's one bowler who deserves a bit of luck at the end of his spell it is Mitchell Santner. He's bowled beautifully.
Taskin c Mitchell b Santner 17 (Ban 214-8)
Thoroughly deserved for Mitchell Santner!
The left-arm spinner does get his wicket as Taskin Ahmed slog-sweeps his last delivery out to Daryl Mitchell at deep backward square.
It went flat but Mitchell made no mistake. Santner ends with 1-31 from his 10.
Stephan Shemilt
BBC Sport chief cricket writer
Taksin Ahmed is a powerful man who bowls quick but also shows he can hit the ball a good distance as well.
After swinging and missing at two bouncers, Taskin Ahmed is pleased to see a fuller ball from Lockie Ferguson and drives crisply through the covers for two.
It's a big hit to end the over, though. Taskin clears his front leg and wallops his second six over deep mid-wicket!
A few more shots like that from Taskin Ahmed wouldn't go amiss for Bangladesh...
No wickets yet but Mitchell Santner has been excellent again for New Zealand.
He's through nine overs and has conceded only 30 with four singles coming from his latest.
Seven overs to go and you feel Bangladesh will have to try and accelerate soon.
Roushan Alam
Host of The Bangla Cricket Podcast on BBC Test Match Special
Bangladesh have been on the back foot for the whole innings. Every time they have looked to kick on they have lost a wicket. A total of 220 is not going to scare New Zealand so they have to go for it from here. It's not a bilateral series, it's a one-off World Cup game with points on the line.
Mahmudullah is being careful not to take too many risks at this stage.
But when Lockie Ferguson's gets the line wrong with his bouncer, the Bangladesh right-hander is quick to pull it away behind square for four.
That brings up the 200 for Bangladesh. A small milestone reached.
Aatif Nawaz
BBC Test Match Special commentator
What a shot from Taskin Ahmed. It's against the run of play but he goes down on one knee and then he just slaps it! It's the fifth biggest six of the tournament.
That will help Bangladesh!
A little bit of flight from Rachin Ravindra and Taskin Ahmed picks it up and hammers it over cow corner for six.
Aatif Nawaz
BBC Test Match Special commentator
If Bangladesh go at around a run a ball they still get to 240 or 250 from here. I think it's one of those wait and see where you are after 45 overs or so.
Thanks, Mike.
New Zealand have been impressive again and Bangladesh just have to dig in and try to claw their way up towards 250 in these last 10 overs.
A typical tight over from Boult with little chance of going big for Bangladesh. Taskin takes a leg-bye off his pads as the ball runs square, the faintest appeal from Boult but nothing doing there.
Bangladesh have some work to do to reach a defendable total. Here's Sam Drury to guide you through the conclusion of this innings.
Taskin Ahmed replaced Hridoy at the crease and he takes a first single with a run down to third.
Stick or twist here for Bangladesh's batters? Do they try to bat the overs or hammer a few quick runs? Mahmudullah may feel that he has to go for it - Taskin averages just 6.87 with the bat and he's got two batters beneath him in the order.
Roushan Alam
Host of The Bangla Cricket Podcast on BBC Test Match Special
It was nothing shot from Tawhid Hridoy. He played that almost as if he was just shadow batting. It leaves Mahmudullah with a job to do for Bangladesh. He has been used as a impact batter to boost the run rate but he's got to do the opposite here.
Hridoy c Santner b Boult 13 (Ban 180-7)
New Zealand smell blood and bring back Trent Boult and he has a victim in his first over!
Hridoy skews the penultimate delivery into the covers. It's a sharp chance for Santner, the ball rising on him but he takes with raised hands at shoulder height, despite appearing to not have his eyes on the ball.
That's Boult's second wicket of the day and his 200th in ODIs.