By Kirsty Needham

SYDNEY, May 20 (Reuters) - Australian Prime Minister Scott Morrison criss-crossed the country in a final day of campaigning, insisting he could still win Saturday's election despite polls pointing to a change of government or hung parliament.

Morrison and Labor Opposition leader Anthony Albanese targeted marginal seats in the final 48 hours of the six-week campaign as data showed wages growth being outstripped by inflation, and record low unemployment - fodder for competing claims on who would best manage the economy.

An Ipsos opinion poll published by the Australian Financial Review showed Labor leading Morrison's ruling Liberal-National coalition 53% to 47% on a two-party preferred basis, where votes are ranked by preference and distributed to the highest two candidates.

Labor's primary vote shrunk to 36% to the coalition's 35%, with minor parties and independents attracting nearly a third of voters, raising the prospect of a minority government.

Morrison, in a blitz of media interviews on Friday morning, said he could still win, and pointed to his economic competence.

"What I've demonstrated over these last three years - not everybody's agreed with me... and not everybody likes me - but that's not the point. The point is, who can manage the nation's finances to keep downward pressure on rising interest rates, downward pressure on cost of living?" he said on ABC News Breakfast, before campaigning in Western Australia.

Albanese campaigned with former Labor Prime Minister Julia Gillard in the South Australian capital of Adelaide on Friday morning.

In 2010, after the election delivered a hung parliament, Gillard only formed government after extended negotiations with independents and minor parties.

In key Liberal seats, the biggest threat is a wave of independent candidates, mostly female, campaigning for action on climate change after some of the worst floods and fires to hit Australia.

Another challenge for the major parties is a A$40 million advertising blitz by billionaire Clive Palmer's United Australia Party, which is fielding candidates nationally.

ABC election analyst Antony Green said unlike the previous election, Palmer's advertising blitz hadn't singled out Labor for attack, which could impact preference flows and the result.

Election rules were changed on Friday to allow all voters who tested positive for COVID-19 to vote by telephone, removing a cut-off of Wednesday.

More than 6.5 million pre-poll or postal votes were already cast out of 17 million eligible voters in Australia's compulsory voting system.