Left-wing candidate Andrés Manuel López Obrador has won a landslide victory in Mexico's presidential election.
Photo: AFP PHOTO / ALFREDO ESTRELLA
The former mayor of Mexico City, who was the front-runner ahead of the vote, looks to have polled about 53 percent, one survey by Parametria said.
All exit polls and initial results put him well ahead.
His closest rivals both admitted defeat and congratulated Mr López Obrador on his victory.
Ruling party candidate José Antonio Meade, who lay in third place according to initial results, told supporters that he wished him "the greatest success".
Mr Meade's Institutional Revolutionary Party (PRI) has dominated Mexican politics for much of the past century but has slumped in popularity.
Ricardo Anaya, candidate for the conservative National Action Party (PAN), looked set to be runner-up to Mr López Obrador - who is widely known by his initials, Amlo.
"I recognise his triumph, I express my congratulations, and I wish him the greatest success for the good of Mexico," Mr Anaya said.
US President Donald Trump took to Twitter to congratulate Mr López Obrador "on becoming the next president of Mexico".
Congratulations to Andres Manuel Lopez Obrador on becoming the next President of Mexico. I look very much forward to working with him. There is much to be done that will benefit both the United States and Mexico!
— Donald J. Trump (@realDonaldTrump) July 2, 2018
Sunday's election followed one of Mexico's deadliest campaigns in decades with more than 130 political candidates and party workers killed.
Mr López Obrador has been runner-up in Mexico's two previous elections but now seems likely to end the dominance of the PRI and the PAN.
He has referred to them as being part of the same "mafia of power".
Many Mexicans have grown disillusioned with incumbent President Enrique Peña Nieto's PRI administration, particularly over the sluggish economy and endemic corruption.
Mr López Obrador, 64, put tackling corruption at the centre of his election campaign, promising to improve wages and pensions by stamping out rampant abuse.
His opponents tried to paint him as a populist who cannot be trusted with the economy.
Mr López Obrador has been the candidate most critical of Mr Trump and has said he will make the US president "see reason".
Mr Trump has continuously attacked Mexico over trade and migration, saying he will renegotiate the North American Free Trade Agreement (Nafta) and build a wall along the US-Mexico border.
His hardline stance on migration - particularly the separation of migrant families at the US border - has brought widespread condemnation.
Some 2,000 children remain separated from their migrant parents, despite Mr Trump agreeing to curtail the policy.
- BBC
