Independent MP Nicolette Boele has been locked in as the member for Australia's most marginal seat after her Liberal opponent conceded defeat.
Liberal Gisele Kapterian said she had abandoned a last ditch legal challenge to the result some four months after the May federal election.
Ms Kapterian on Thursday said she was satisfied the result was correct after a final review of the ballot papers.
Ms Boele won the Sydney-based seat of Bradfield, a former Liberal stronghold, by just 26 votes.
"Serving this community is the privilege of my lifetime, and I do not take this responsibility lightly. I will continue to serve with integrity, care, and dedication," Ms Boele said in a statement following the concession.
"Being part of this process has given me an even greater appreciation for the safeguards we have in place, and the value of every single vote.
"While we watch checks and balances erode in other countries, our electoral and judicial processes are something we can genuinely celebrate here at home."
Ms Boele cut Bradfield's margin down to four per cent at the 2022 election when she came up against then Liberal minister Paul Fletcher and claimed the razor-thin victory in 2025 after his retirement from politics.
The seat was initially declared for the Liberals before a recount put Ms Boele in front, leading to the Liberals launching a legal challenge.
Ms Kapterian said ballot paper interpretation was often difficult and subjective.
"In other words, after asking the on-field decision to go to the video umpire, we have had the opportunity to review the play and can now be satisfied the right call was made overall," she said in a statement.
"Accordingly we have taken the decision to no longer press the petition for a final review by the Court of Disputed Returns.
"I wish Ms Boele all the best in the role and I thank the people of Bradfield for this incredible opportunity."
Ms Kapterian, who was tentatively named in Opposition Leader Sussan's Ley's extended shadow ministry should she have won the seat, called for a "modern Liberal Party that speaks to the concerns of Australians".
"I am disappointed to miss out on contributing from inside the party room but I will continue to play my part," she said.
The Australian Electoral Commission said it had been formally notified Ms Kapterian was withdrawing her petition to the court and so Ms Boele remained the elected member after she was officially sworn into parliament on July 23.
Electoral commissioner Jeff Pope lauded Australia's robust democratic processes as he thanked commission staff for their efforts in conducting and supervising the recounts.
"Their hard work, and their commitment to election integrity has met the very high standards that Australians rightly expect from the AEC at every federal election," he said.
