Next Saturday's Afghan presidential election run-off has been cancelled by the independent election commission, officials say.
The decision comes a day after sole challenger Abdullah Abdullah pulled out, leaving only President Hamid Karzai in the race.
Dr Abdullah, who had demanded key poll officials quit, said he was quitting as he did not think it would be fair.
The first round of the vote in August was marred by mass electoral fraud.
President Karzai had been the favourite to win the run-off after gaining more votes in the first round on 20 August.
The BBC's Andrew North in Kabul says a key reason for holding a run-off was to try to restore some legitimacy to the election after the discredited first round.
He says the cancellation of the 7 November vote seems the most unsatisfactory outcome to the whole process.
Earlier on Monday, UN Secretary General Ban Ki-moon visited Kabul and said Afghanistan's troubled election had been among "the most difficult the United Nations has ever supported".
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