Current President Borut Pahor received 47% of votes in the first tour, this way qualifying for the second. His opponent is Marjan Sarec, who received 27% of votes in the first tour.
In the past, Borut Pahor was a leader of social-democrats, but now is running as an independent candidate. He was the Prime Minister of Slovenia in 2008-2012 when the country faced the worst financial crisis in its history.
Marjan Sarec is a comedian, who was Mayor of the Alpine town of Kamnik twice.
Opinion polls published on Friday showed Pahor securing between 52 and 56.3 percent of the vote, but analysts said the outcome was uncertain, as Sarec has closed the polling gap in recent weeks.