The gap between the two rivals in the battle for Victorian seat Indi is narrowing amid predictions Liberal frontbencher Sophie Mirabella may hang on.
Independent Cathy McGowan leads Mrs Mirabella by 764 votes, with 80 per cent of the votes counted.
Ms McGowan has received 50.51 per cent of the vote to Mrs Mirabella's 49.49 per cent on a two candidate preferred basis.
There are still about 20,000 votes to be tallied, including at least 8800 postal votes which can take up to 13 days to arrive after the poll.
However, ABC election analyst Antony Green suggests Mrs Mirabella will get over the line.
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He predicts Ms McGowan is not far ahead enough on pre-poll, postal and absentee votes, which usually favour the incumbent.
"Ms Mirabella would have written to every constituent in the electorate offering a postal vote application and traditionally they tend to favour the party that does that best," he told ABC radio.
Ms McGowan also wouldn't have had anyone handing out how-to-vote cards outside Indi to influence the thousands of absentee votes cast outside the electorate on polling day, he added.
The fight for the Victorian seat of McEwan is even closer, with just 331 votes the difference.
Liberal challenger Donna Petrovich is in front of sitting Labor member Rob Mitchell with 50.20 per cent of the vote on a two-candidate preferred basis.
About 78 per cent of votes have been counted, with at least 10,000 postal votes yet to be tallied.
