After upsetting tournament favourites Belgium 5-4 on Wednesday, the Black Sticks have continued the Four Nations winning way against Japan.
A third-quarter goal from Shea McAleese gave the Black Sticks their first lead of the night, which they carried en route to a 4-1 victory in Mt Maunganui.
The win meant that Black Sticks were the last unbeaten team in the competition after Belgium beat India earlier in the day.
The Kiwi side went into the match with the favourites tag, ranked seven spots higher than Japan (16) in the world. However it was Japan who had the better start, stifling the Black Sticks' attack and working hard on the counter.
The New Zealand side were stunned in the first quarter when a fast attack from Japan saw them get onto the score sheet to lead 1-0.