MOSCOW (Sputnik) — The incumbent was touted as the front-runner by the opinion poll trackers prior to the election, but the 62-year old needs to garner more than half of the votes to avoid a second-round run-off.
Komorowski is an independent candidate, supported by the Civic Platform center-right party, which is a major coalition partner in the country's parliament.
Andrzej Duda, of the Law and Justice conservative party, which is led by former Prime Minister Jaroslaw Kazcynski, was predicted to finish as runner-up in Sunday's vote.
In the 2010 Polish presidential election, Komorowski claimed just over 53 percent of the votes to see off Jaroslaw Kaczynski, the twin brother of former President Lech Kaczynski, in the second round.
Overall, eleven candidates, including former rock singer Pawel Kukiz, who is expected to come third, are running for Polish presidency after collecting the required 100,000 signatures of voters each in the run-up to the elections.
In Polish politics, the post of prime minster is considered to be the most powerful, but president heads the armed forces, can veto legislation and has the power to dissolve parliament in certain cases.