According to the poll, conducted by the National Consulting Center (CNC) for CM& Television between October 25 and 27, 30% of respondents said they will vote for Petro.
Approximately 21% of respondents favored Green Party candidate Enrique Peñalosa, while 15% said they planned to vote for independent Gina Parody.
The poll placed Cambio Radical candidate Carlos Fernando Galan in fourth, with 14% of the intended votes.
A Thursday Datexco poll also put Petro on top and showed that the candidate with the most favorable image among voters is Galan, while Peñalosa has the least favorable image.
Three percent of respondents said that they would not vote for any of the candidates on the ballot.