NZ First had also fallen in the latest One News Colmar Brunton poll released on Wednesday night and was dangerously close to falling below the 5% threshold.
In a complete reversal of momentum from the previous poll, National had arrested its fall, instead rising six points to 46%.
Labour was down seven points to 37%.
Under the latest poll, NZ First was back to holding the balance of power - but only by the skin of its teeth.
NZ First has fallen 1.5% If the party fell any further, it would need leader Winston Peters to retain the Northland seat to remain in Parliament.
National and its support partners Act and the Maori Party would not be able to form a Government, and would need NZ First to get over the line.
The Greens have risen 1 point to 8%, meaning that the left-bloc of Labour and the Greens have 45%. A coalition with NZ First would get them a majority - but only just.
In more bad news for Labour, leader Jacinda Ardern has fallen in the preferred Prime Minister poll. She is down 3 points to 31%.
National leader Bill English, on the other hand, rose five points to 37%.
The Opportunities Party is steady on 2% and the Maori Party remains on 1%. Act is on 0.3%.
The 1 News Colmar Brunton poll has now lined up with the Newshub Reid Research poll, which has National holding a 10-point lead over Labour.
In the lead-up to the polling period, Labour made a U-turn on its tax policy after sustained attacks from National on its "vague" plans.
Ms Ardern said her party would delay any tax changes on property until after the 2020 election, rather than introducing them in the next term.
Mr English has come under pressure over the fuel crisis in Auckland, which was caused by an oil pipeline being severed and led to domestic and international flights being cancelled.
Opposition parties have used the incident to attack National on its management, and its failure to put in place crucial infrastructure.
Under the latest 1News poll, NZ First's Shane Jones would not get back into Parliament.
Nearly 600,000 people have cast early votes ahead of the election on Saturday.
