Will Young and Adam Milne each had a standout performance with the bat and the ball. Young scored 70 runs off of 80 balls to lead New Zealand to a seven-wicket victory.
By defeating Bangladesh 2-0 in the three-match series with a seven-wicket victory in the last one-day international on Tuesday in Dhaka, New Zealand handed itself the ideal boost before the World Cup.
Najmul Hossain Shanto, the stand-in skipper for Bangladesh, scored the most runs with 76, but was unable to offer the home team a competitive total due to a lack of assistance from the other end after choosing to bat first.
Will Young and Adam Milne both had a standout performance with the bat and the ball. Young led New Zealand to 175-3 by hitting 70 off 80 balls.
At the Sher-e-Bangla National Stadium in Dhaka, Milne's 4-34 held the home team to 171 in 34.3 overs.
Despite losing Dean Foxcroft ((0) and Finn Allen (28) to consecutive deliveries from Shoriful Islam, New Zealand was able to easily surpass its mark because to Young and Henry Nicholls' 81-run third-wicket stand.
Nasum Ahmed, a left-arm spinner, bowled Young when New Zealand was already well in charge.
With a single off Mahmudullah Riyad, Nicholls, who had scored 44 and 49 runs in the previous two games, went on to score 50 runs this time.
With 91 balls remaining, Tom Blundell (23 not out) hit a boundary to send New Zealand home.
Milne, who was playing his first match of the series, was earlier supported by Cole McConchie and Trent Boult, who both claimed 2-18 and 2-33 to deny Bangladesh any significant momentum in the match.
The second game was won by the Kiwis by 86 runs on Saturday. The Kiwis had lost the previous two series in Bangladesh by scores of 4-0 in 2010 and 3-0 in 2013. Rain caused the first game to be abandoned.
"The World Cup is just around the corner -- to come up with the first win since 2008 is great," said Young, the game's MVP, in a press conference afterward.
This group has a lot of fun together, he said, and we get along great.
Young expressed his hope that the conditions the Kiwis would encounter in India when the World Cup began on October 5 even if he was unable to forecast them.
When the series was on the line, Bangladesh reinstated mainstays Najmul, Mushfiqur Rahim, and Shoriful Islam after initially resting crucial players. But it didn't really help them perform better.
For the first time as the captain of Bangladesh, Najmul held down one end as he reached his sixth ODI fifty, while wickets continued to tumble frequently from the other end.
Najmul claimed that "our batsmen didn't score big runs." "Hopefully, batters will bat long and responsibly next time."
Bangladesh was reduced to 35-3 by Milne and Boult's early strikes before Najmul and Mushfiqur provided a brief bulwark with a 53-run fourth wicket stand.
New Zealand regained the lead after Mushfiqur was dismissed by Lockie Ferguson for 18 runs, and the tourists never lost it again.
Najmul, a left-hander who smashed 10 fours in his 84-ball innings, was dismissed by McConchie with his second delivery of the day, effectively ending Bangladesh's chances of posting a competitive total.
