Mitch Hay's rollicking 99 not out backed by some feisty seam bowling steered New Zealand to an 84-run win over Pakistan on Wednesday to take an unbeatable lead in their one-day international series.

New Zealand made 292-8 and bowled Pakistan out for 208 in the 42nd over in Hamilton in the second of three ODIs.

Hay's lusty hitting snapped a mid-innings slump by the hosts as he raced to a career-best score which included 22 off the final over by Mohammad Wasim.

The wicketkeeper-batsman smacked seven fours and as many sixes in his 78-ball innings after going into the middle with New Zealand struggling at 132-5 in the 27th over.

In reply Pakistan were in early trouble when Will O'Rourke had Abdullah Shafique (one) caught at first slip in the third over and in the following over Babar Azam (one) was caught at second slip off Jacob Duffy.

Duffy struck again in his next over with the wicket of Imam-ul-Haq. Pakistan were 9-3 in the sixth over when New Zealand at the same stage were 50-0.

Ben Sears entered the attack and took two wickets in his first over, removing Salman Agha for nine and Mohammad Rizwan for five.

A combination of poor shot selection and some lively seam bowling reduced Pakistan to 32-5 after 12 overs.

Tayyab Tahir (13) and Faheem Ashraf put on 33 for the sixth wicket and when Haris Rauf retired hurt on three, his concussion replacement Naseem Shah put on 60 with Ashraf.

Both posted maiden 50s with Ashraf scoring 73 off 80 deliveries and Naseem making 51 from 44.

Sears took 5-59 for New Zealand.

Rizwan won the toss and opted to bowl with overcast skies and a green-tinged wicket favouring the bowlers.

Novice Black Cap openers Nick Kelly and Rhys Mariu took control early.

They put on 54 before Kelly, in only his second international, was caught behind for a hard-hitting 31 which included four fours and two sixes.

Debutant Mariu followed soon after for 18 off 25 when a leading edge lobbed up to Azam at mid-off in Wasim's opening over.

Wasim and Rauf slowed the scoring and it took Henry Nicholls and Daryl Mitchell until the 16th over to get New Zealand to the 100 mark.

The introduction of spin brought Mitchell's innings to a halt for 18, stumped by Rizwan when beaten in the air by Sufyan Moqim. Nicholls went for 22 in the following over.

Michael Bracewell and Muhammad Abbas added only 30 runs in the next 10 overs when Bracewell was caught behind off Wasim for 17.

Pakistan-born Abbas and Hay set about restoring the innings with a patient 77-run partnership until Abbas went for 41.

Moqim was the pick of the Pakistan bowlers with 2-33 while Wasim took 2-78.

The third and final match is at Mount Maunganui on Friday.

In the post-match presentation, Rizwan acknowledged the challenges his team faced, saying, "It is sore, but it's part of the game. We didn't do well today. We didn't utilize the swing effectively, and New Zealand bowled very well. Later on, Faheem and Naseem fought well for us. These are challenging conditions, but we can't make excuses. We are professional cricketers, and we need to do something different."

He also praised New Zealand's disciplined bowling attack.

"The bowlers of New Zealand were very disciplined; they bowled the hard lengths. In the last couple of months, we've lost key moments. Today, we didn't perform well with the ball or the bat in the first 10 overs. Credit to Mitch Hay as well; the way he batted was amazing," Rizwan said. "We don't know much about the pitch in Tauranga, but we'll have to adapt." AFP