Kais Saied wins 73 percent of the votes, the electoral commission says. His opponent, Nabil Karoui, had already conceded defeat.
Independent outsider and law professor wins landslide victory in presidential runoff, sweeping aside his rival, media magnate Nabil Karoui, exit poll shows.
Tunisians are going to choose the president among a populist tycoon who just got out of jail against a conservative professor in a runoff vote on Sunday.
Ennahda came first in Sunday's parliamentary election, winning 52 seats, while media mogul Nabil Karoui's Heart of Tunisia party won 38 seats in the 217-seat chamber, the electoral commission said.
Neither candidate has ever held political office but they beat out two prime ministers and the candidate for the moderate religious party Ennahdha.
Tunisia is the only Arab country to have emerged with a viable civil society and democracy after the Arab Spring, but the system is on the ropes as authoritarianism casts its shadow over the country.
Kais Saied, a law professor, and Nabil Karoui, a media mogul, will face off in the October runoff election according to an exit poll by Sigma Conseil.
Tunisians cast votes in a highly competitive presidential election to punish the political elite amid widespread discontent at economic hardship eight years into the 2011 revolution.
Nothing is certain in Tunisia's presidential election, only the second since the 'Arab Spring'.
As the election campaign gains momentum, the country's media tycoon Nabil Karoui remains imprisoned in a highly politicised case, raising questions about the judiciary's non-interference in court cases.
A large mix of candidates is getting ready to run for Tunisia’s presidency in what is set to be a highly competitive and unpredictable ballot, the second democratic presidential poll after the first historic elections in 2014.
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