In the process, he became his countries highest run scorer in the shortest form of the game in a clash which they lost regular wickets in with four players scoring between 13 and 19.
Finch was able to deal well on a tough looking pitch, as he also took 26 off the final over of the innings from Kyle Jamieson to help his side score 156-6 from their 20 overs.
Much like Australia, New Zealand also lost wickets regularly in their response with Jamieson the only player to make it past 30 as they were dismissed for just 106, losing by 50 runs.
Kane Richardson was the star with the ball, taking 3-19, while Ashton Agar was impressive collecting figures of 2-11 from his four overs.
The final match of the evening takes place on Saturday evening at 23:00 GMT as both sides look to edge out the series.
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