Miguel Angel Mancera, candidate of the Party of the Democratic Revolution, or PRD, Workers Party, or PT, and Citizens Movement coalition, won the Mexico City mayoral election by a wide margin, the Federal District's Partial Electoral Results Program said.
Mancera, a former district attorney, won 63.64 percent of the vote in Sunday's election.
"I am not going to let you down," Mancera said in a brief press conference, adding that he would keep implementing policies that benefit the sprawling capital's residents.
The PRD retained city hall and control of the majority of Mexico City's 16 boroughs.
Institutional Revolutionary Party, or PRI, and Green Party candidate Beatriz Paredes came in second, winning 19.47 percent of the vote.
Activist Isabel Miranda de Wallace, of the National Action Party, or PAN, ended up in third place, with 13.9 percent of the vote, while Rosario Guerra, of the small New Alliance Party, or PANAL, got just 1.19 percent of the ballots cast.
Mancera will succeed Marcelo Ebrard as mayor of the Mexican capital, one of the world's largest cities.
Mexico City has been governed since Dec. 5, 1997, by the leftist PRD. EFE