(VOVworld) - Leftist leader Dilma Rouseff and centrist Aecio Neves are locked in a neck and neck race as Brazilians are set to vote in the presidential run-off.

Two main rivals in Brazil’s Presidential run-off: Madam Roussef (left) and Mr. Neves

Though many polls put Rouseff of the Workers Party ahead of her rival, the result is considered too close to call. Polling stations open at 8 an on Sunday and close at 5pm. The electronic voting system will allow initial results to be released in a few hours later. The last-minute campaign was largely focused on tapping the undecided voters, who roughly make up to 10% of the electorate.