Center-left candidate Alvaro Colom is holding the lead as official return are counted from Guatemala's run-off presidential election.
With ballots from 68 percent of the nation's polling stations counted Sunday night, Colom had 51.4 percent of the vote, to 41.6 percent for retired General Otto Perez Molina.
Colom and Perez were the top two finishers in the first-round presidential election, in September.
Perez based his campaign on pledges to fight crime and combat drug trafficking. Colom's platform focused on poverty issues.
About 50 people died in election-related violence before September's vote, making it the deadliest political campaign since Guatemala's 36-year civil war ended in 1996.
Gunmen in Guatemala City killed a Perez aide last month. The retired general has linked the killing to his vow to crack down on drug trafficking.
Some information for this report was provided by Reuters.