Assistant Treasurer David Bradbury has conceded defeat in the marginal western Sydney seat of Lindsay.
Liberal candidate Fiona Scott, described during the campaign by prime minister-elect Tony Abbott as having "sex appeal", has scored 52.04 per cent of the vote, with 70.94 per cent of ballots counted.
Mr Bradbury secured 47.96 of the vote with a 3.16 per cent swing away from him.
"We've conceded," a spokesman for Mr Bradbury told AAP.
Mr Bradbury held the seat on a slim margin of 1.1 per cent.
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Candidates from The Greens, Family First, the Christian Democrat Party, the Australia First Party an independent were also contesting the seat.
