Brendon McCullum smashed 80 runs off just 28 balls as New Zealand destroyed Bangladesh by 10 wickets in Queenstown to seal the one-day series 3-0.
Daniel Vettori took 5-7 to move past Chris Harris's New Zealand record of 203 for his one-day career to bowl the Tigers out for 93.
New Zealand reached Bangladesh's total with an astonishing 44 overs to spare, 31 balls quicker than the old record.
McCullum smashed nine fours and six sixes in a devastating onslaught.
The Kiwis had 264 balls left to face when the match came to an early end, breaking the previous record of India, who beat Kenya with 231 deliveries in hand in 2001.
Vettori won the toss and put Bangladesh into bat, and the Tigers were soon floundering with Kyle Mills removing opener Junaid Siddique in the third over.
Tamim Iqbal and Mohammad Ashraful toiled to take Bangladesh to 41 after 15 overs, before a batting collapse left the Tigers' innings in tatters.
Vettori dismissed Aftab Ahmed for 19 and the left-arm spinner then swept through the lower order, taking the wickets of Shakib Al Hasan, Mushfiqur Rahim, Mashrafe Mortaza and Farhad Reza.
Abdur Razzak was caught at third man by Chris Martin off a Mills delivery as Bangladeshi ended on 93 all out after 37.5 overs.
The target proved embarrassingly easy for the Kiwis, with McCullum almost singlehandedly chasing down the total.
McCullum's 50 off 19 balls beat his own New Zealand record of 20 balls, set against Canada at St Lucia in the World Cup in March.
It was two balls more than the world record of 50 off 17 balls held by Sri Lanka's Sanath Jayasuriya, against Pakistan in Singapore in 1996. McCullum's score was a world record 84.2% of his team's total.
The previous mark was 72.7% held by West Indies opener Desmond Haynes, against New Zealand in Trinidad in 1985, when he scored 85 out of 117. Vettori's haul gave him world-leading 43 one-day wickets in the calendar year, nudging ahead of India's Zaheer Khan, who has 40 in 2007.
