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The Green Party has been polling near the 5% threshold in recent public polling, so needs to win an electorate seat to secure its return.
Labour's Helen White has a strong lead in the Reid Research poll for Newshub Nation, with 42.3% support.
National's candidate, Emma Mellow, has 26.6% support, while Chloe Swarbrick has 24.2.
In terms of party support, Labour is at 56%, National 23%, and the Greens attract 12%.
The Auckland Central electorate has been held by outgoing National MP and former deputy leader Nikki Kaye for 12 years, but seat became a fierce battle-ground after Kaye announced she was leaving politics after the election.
Mellow was last month selected to take the spot vacated by Kaye, in a process purposely slowed by National party bosses.
She is confident the poll shows it is still a three-way race.
Swarbrick is also confident, telling her followers it's "very clearly anybody's race".
"Auckland Central does not belong to a political party, it belongs to the people of Auckland central.
"People told us that we couldn't do this, people told us that it was impossible, people told us to wait for polls and we'll be in single figures ... it's untrue.
"We are within a percentage point of the National Party candidate and this is a three-way race," Swarbrick said.