Labor has held on to a narrow overall lead over the past fortnight but the prospect of a hung parliament has increased as voters flock to third parties, the latest Fairfax-Ipsos poll shows.
The result of the July 2 election could mean that the Greens and Nick Xenophon and his new party could become kingmakers, the poll for Fairfax Media indicates.
The nationwide survey put the opposition ahead at 51-49 in two-party preferred terms.
A majority of voters, however, continue to predict a coalition victory, at 54 per cent, consistent with the view of betting markets and the majority of political pundits.
The June 14-16 poll also shows Malcolm Turnbull remains the popular choice as preferred prime minister at 48 per cent to 34 for Labor leader Bill Shorten, who however, has been on the rise.
Fully 28 per cent of voters plan to support candidates other than Labor or the coalition with their first preference vote.
The Greens' party vote stands at 14 per cent, up 5 percentage points from the 9 per cent share it received in 2013.
Another 14 per cent intend to support "others", raising the potential for a hung parliament.
Labor's primary vote has dropped to a low 33 per cent while the coalition primary vote has fallen faster to 39.
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