Slovakia goes to the polls in a presidential election that pits the current prime minister against an independent challenger, the BBC reports.
PM Robert Fico is seen as the frontrunner, ahead of businessman-turned-philanthropist Andrej Kiska.
Opinion polls predict a two-candidate run-off vote will follow as no one is expected to win an outright majority.
Mr Fico’s leftist Smer party won over half of the seats in parliament in the 2012 general election.
The Slovak president has the power to appoint the prime minister, as well as the main figures in the judiciary.
However, it is a largely ceremonial role and parliament exercises legislative power.