Defeats of Wales 29-5 and Niue 49-5 books them a quarterfinal berth tomorrow in the third leg of the International Rugby Board series.
However, they are to face a pool-deciding showdown late tonight against series defending champions South Africa, who accounted for the same opposition just as easily.
New Zealand's only rocky moment came in the opening minutes against Niue, when they conceded the opening try to Jason Karena.
However, it was one-way traffic from there, with Waikato pair Tim Mikkelson and Save Tokula -- the latter possessed of a devastating fend -- both bagging hat-tricks in a seven-try romp.
The other try went to Nafi Tuitavake while Lote Raikabula slotted all seven conversion attempts in a comprehensive outing.
Star winger Sherwin Stowers crossed for a double inside the first four minutes against Wales, ensuring there was no repeat of the Welsh boilover in the equivalent pool match here last year.
Unlike last year's match, when New Zealand paid for ill-discipline in a 17-28 defeat, the hosts were able to dominate possession and play a fluent style.
The early beneficiary was Stowers, who scored 15 tries in New Zealand's tournament wins in Dubai and South Africa two months ago.
Ben Souness crossed to put New Zealand 17-0 up at halftime, while the second-half tries went to captain DJ Forbes and replacement Tuitavake, the latter when Welshman Jevon Groves was in the sinbin.
Stowers' pace was a constant menace out wide while Kurt Baker also displayed some silky touches.
Elsewhere, there were few upsets in the opening two rounds of matches aside from Canada's surprising 26-7 thumping of Argentina.
Favoured nations Samoa, England, Kenya, Fiji and Australia all booked quarterfinal berths as double-match winners in fine conditions in front of the traditional potpourri of fancily-dressed supporters.
Fiji were the most rampant attacking outfit, hammering Scotland 36-5 and Papua New Guinea 41-0 while England's rollercoaster 24-19 defeat of Tonga was the best early spectacle.
