Leftist candidate Andres Manuel Lopez Obrador looks set to win Mexico’s presidential election, according to exit polls.
One poll showed the former mayor of Mexico City winning between 53% and 59% of the vote, well ahead of his two main rivals from Mexico’s ruling parties.
Another poll showed him winning between 43% and 49% of the vote.
Governing party candidate Jose Antonio Meade has conceded the election, saying Mr Lopez Obrador bears the responsibility of the next government.
“For the good of Mexico, I wish him the very best of success,” Mr Meade said.
Opposition candidate and conservative Ricardo Anaya has also congratulated Mr Lopez Obrador on his win.
Mr Anaya said in a televised speech that “the trend favours” Mr Lopez Obrador, adding: “I recognise his triumph”.
The result is a shift to the left for Mexico and a big break with the ruling Institutional Revolutionary Party (PRI) and conservative National Action Party (PAN) which, between them, have governed the country for nearly a century.
He has vowed to transform Mexico, reduce its dependence on the US, rule for the poor and overthrow the “mafia of power” he says have looted the country.
Mr Lopez Obrador enjoyed a wide lead in opinion polls throughout the campaign, his third for the presidency.