The Silver Ferns have held off a sterling challenge from the Jamaicans to further stake their claim for a tilt at the netball world title.
But the 55-48 win was far from polished.
Coach Wai Taumaunu started with the same seven that was so successful against the Australians on Sunday.
The Ferns led by three after the first quarter but the Jamaicans turned things around quickly in the second, to go into the main break with a 27-24 advantage.
The only change to the line up was the introduction of Leana de Bruin at goal defence.
In the later part of the third quarter, New Zealand went on a mini rally and were able to go into the final period with a three goal advantage.
Jamaican shooter Romelda Aitken had dominated throughout the game but the Ferns started to pick up crucial ball on defence and played with more confidence to close out the game.
The Ferns coaching staff will be concerned about the number of offensive penalties goal shoot Bailey Mes copped and some loose play on attack.
Mes finished with 19 from 25 attempts, while Maria Tutaia took a bulk of the shots again with 36 from 43.
Australia beat England 51-41 in the night's other big game meaning the likely semi-final lineup on Saturday will be New Zealand against England and Australia against Jamaica.