Guptill hit seven fours and four sixes to amass 71 runs off 46 balls as the New Zealanders bounced back from two straight losses to clinch the series.
Set a target of 143 to win, New Zealand made a strong start to their innings, with openers Devon Conway and Guptill putting on 106 runs before Conway fell to Riley Meredith, with Ashton Agar taking the catch.
Kane Williamson was out without scoring soon after but Guptill continued to push the Black Caps towards Australia’s total until he was caught by Mitchell Marsh off Jhye Richardson‘s bowling.
With fans allowed into the stadium following the lifting of New Zealand’s coronavirus restrictions, Guptill left to a standing ovation before Glenn Phillips hit a towering six to complete the win.
Australia, who named an unchanged line-up following their win in the fourth meeting of the series on Friday, lost eight wickets for 142 in their innings.
“It’s been a great series to be a part of,” Kane Williamson acknowledges a special couple of weeks & thanks… https://t.co/eoPwn7ub6G
— BLACKCAPS (@BLACKCAPS) 1615084249000
Matthew Wade top scored with 44 off just 29 balls while captain Aaron Finch followed up his impressive performances in the previous two matches with 36 runs from 32 balls.
With 4/28, 1/41, 2/32, 3/32 and 3/24 today – Ish Sodhi is the @kfcnz Player of the Series 👏🖥 @sparknzsport… https://t.co/tLG1HYce2k
— BLACKCAPS (@BLACKCAPS) 1615085196000
The Australian batsmen struggled to find their tempo on a tricky surface with New Zealand’s bowlers keeping the visitors in check throughout the final 10 overs to set up a successful run chase.