Belligerent batting by Sanju Samson saw India chase 226 for victory against New Zealand in Christchurch on Thursday in a rematch of the T20 World Cup final.
Opener Samson made 67 from 33 balls as India chased down their highest-ever T20 total and secured a four-wicket win with two balls remaining.
India take a 1-0 lead in the five-match series.
Samson and opening partner Abhishek Sharma belted 93 runs between them in the powerplay, obliterating New Zealand’s highly regarded seam attack.
Black Caps captain Mitchell Santner put the handbrake on India’s runaway start, bowling three miserly overs through the middle stages in tandem with fellow spinner Michael Bracewell, the pair snaring four wickets in five overs.
But India captain Shreyas Iyer was a calming presence after Samson fell, chopping on from Santner, finding the boundary when needed to keep the chase manageable.
He departed for 42 from 28 balls in the second to last over.
Naman Dhir saw India home with 42 from just 15 balls.
India won the toss and chose to bowl, seeking to seize on late evening dew during the chase rather than any life in the Hagley Oval pitch.
Finn Allen and Tim Seifert made what then seemed to be a fast start, New Zealand reaching 65-1 at the end of the powerplay.
India would reach the same mark inside four overs during the chase.
Allen hit five fours and two sixes on his way to 45 from 24 balls, out to Axar Patel in the eighth over when trying to hoist the spinner over long-off.
That brought Glenn Phillips to the crease, initially dove-tailing well with Daryl Mitchell in forcing India’s bowlers into different lengths.
Where Phillips was brilliant cutting and pulling the seamers, Mitchell was strong down the ground driving the fuller deliveries.
Mitchell was dropped by Abhishek on 16 but fell soon after for 28 top-edging Arshdeep Singh.
Bevon Jacobs hit a 96m six clean out of the Hagley Oval with his first ball faced as he raced to a 16-ball 31.
But it was Phillips (82 not out) who piled on the most pressure, his running between the wickets pressuring fielders to step in off the boundary, before powering his shots past them to the boundary.
The second match of the series is also in Christchurch, on Saturday.