Polls have closed in the West Australian election with a potentially crushing Labor victory likely to be made official within hours.
With Premier Mark McGowan expected to comfortably lead Labor to a second term, the focus is on how many seats the already-depleted Liberals can save.
A Newspoll published in The Weekend Australian newspaper has Labor leading the Liberals 66 to 34 per cent on a two-party preferred basis.
It would reduce the Liberals to as few as three seats if replicated at the ballot box.
Opposition Leader Zak Kirkup is at risk of becoming the first WA Liberal leader to lose his seat since the 1930s.
The 34-year-old holds the seat of Dawesville by a margin of just 0.8 per cent and has vowed to quit politics if he is voted out.
Such a result would likely spell disaster for other Liberal MPs vying to save their seats.
It would also suggest Mr Kirkup's decision to concede defeat a fortnight before polling day and warn against giving Labor "total control" was a tactical failure.
Federal Liberal senator Ben Small told Seven News that anywhere between five and 10 seats being held by the party "will be celebrated".
Mr Kirkup put on a brave face after voting alongside his father Rob in his electorate on Saturday, saying he had no regrets about the Liberals' campaign.
"I'm very hopeful of continuing to serve in the district of Dawesville and working alongside as many Liberal colleagues as possible in the WA parliament," he said.
Asked whether he ever thought it was possible for the Liberals to win the election, Mr Kirkup - who took over the leadership in November - replied "probably not".
"The reality is, history would be going against us in any case - 1974 was the last time that a first-term government was voted out of office in Western Australia," he said.
"But what's at risk right now is that the Labor party is returned with such a landslide majority that there is no one left to hold them to account."
Mr Kirkup's predecessor Liza Harvey is also at risk of losing her seat of Scarborough.
She said voters at polling booths had told her they appreciated his "honest approach" and that the message about Labor gaining total control had resonated.
"Being an opposition leader, particularly during a pandemic, is the most difficult job in politics," she told Seven News.
"Zac has done a really good job and I do hope he keeps his seat."
Mr McGowan visited a polling place in the district of Hillarys, the Liberals' most marginal seat and one that appears certain to fall to Labor.
The premier warned against political change.
"National cabinet was formed a year ago today and over that time we've dealt with one of the biggest crises the country and world has seen since the Second World War," he said.
"It's been an affirmation for me of the great spirit of our state and we want to have the opportunity to make sure Western Australia stays on its current pathway."
More than 750,000 people voted prior to polling day.
