The peso extended gains after Lopez Obrador's rivals conceded defeat, strengthening around 1 percent against the US dollar and leading gains among major currencies.
The election was a crushing defeat for the ruling centrist Institutional Revolutionary Party, or PRI, which governed Mexico from 1929-2000 continually and again from 2012.
Investors have always been expecting a victory by Lopez Obrador, who held double-digit leads in polls for months. The party also scooped a range of important governorships in Mexico City, Morelos, Chiapas and Tabasco. That compares to 26.1 percent for former speaker of Congress and PAN candidate Ricardo Anaya and 20.8 percent for ex-finance minister Jose Antonio Meade of the PRI party.
Both Moody's and Fitch Ratings said any adjustments of the country's risk profiles and debt ratings would depend on how Lopez Obrador's policies are ultimately implemented.
Supporters of the presidential candidate for the "Juntos haremos historia" coalition, Andres Manuel Lopez Obrador, celebrate at the Zocalo square in Mexico City, after getting the preliminary results of the general elections on July 1, 2018. His election marks the first leftist presidential win in 30 years for Mexico. We have a border of more than 3,000 kilometres, more than 12 million Mexicans live in the United States.
But on Monday, Lopez Obrador told Milenio TV Mexico will seek to remain in NAFTA and that he respects the existing Mexican team renegotiating the trade pact.
Carlos Urzua, Lopez Obrador's pick to be his finance minister when he takes office on December 1, told Reuters on Monday that the new government will aim to reform the pension system and to reduce costs at Pemex during its six-year term.
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Dayra Valdes is a Mexican-born migrant who calls Anchorage home.
"We will search for a relationship with the USA government based on friendship and development, always inculcated with mutual respect and in defense of our compatriots, immigrants who live and work in that country", he said.
Donald Trump also congratulated Lopez Obrador on his electoral win, however, the USA president also said in an interview this weekend he intends to hold off on signing a new NAFTA deal until after America's fall midterm elections.
Lopez Obrador, 64, successfully tapped voters' anger over a seemingly never-ending series of corruption scandals and horrific violence that left a record 25,000 murders a year ago - an orgy of bloodshed fueled by the country's powerful drug cartels.
Lopez Obrador took between 53 and 53.8 per cent of the vote.
Ediane Da Costa Pereira is a Brazilian who became a naturalized citizen in Mexico and voted Sunday in Tijuana, across the border from San Diego.
Trump stated that Mexico would pay for the border wall during his presidential campaign. But Duncan also said that many people are unsure of how Lopez Obrador will be able to provide what he has promised.
"We won't do the dirty work of any foreign government", AMLO said, referring to detentions of Central American migrants trying to reach the U.S. border.