The game was at an interesting stage, with New Zealand 64 for two after 14 overs, when rain arrived.
The duo continued to punish the the Pakistan bowlers with Guptill reaching his fifty with a six. In a batting performance so listless that even New Zealand appeared to be embarrassed by the ease with which Pakistan's innings crumbled, the home side rubberstamped their superiority by bowling Pakistan out for 74, winning by a mammoth 183 runs.
Half-centuries by Kane Williamson and Ross Taylor helped New Zealand to 257 in the face of a sharply improved performance by Pakistan in the field at the third one-day global here today.
On Tuesday Sarfraz took the opposite tack and chose to bat first but the result was the same. Fakhar scored unbeaten 82 in the first ODI was played in Wellington, and was replace with Imam-ul-Haq in the 2nd ODI after being injured.
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Fakhar Zaman (2) played on, giving Boult two wickets in two balls and Mohammad Hafeez was caught at first slip, by Taylor again, and Pakistan were 3-2.
Hasan Ali helped save Pakistan with his highest score in any form of cricket and his 70-run partnership with Shadab Khan for the eighth wicket revived a failing innings.
And so it proved to be, as Pakistan went on to record their lowest ODI total in 25 years.
"We've had a practice game in Nelson so we know the pitch and hopefully we will do well", said captain Sarfraz Ahmed.