Croatia’s incumbent President Zoran Milanovic won most of the votes in the first round of a presidential election on Sunday, but must face a runoff against a ruling party candidate to secure another five-year term.

Opposition Social Democrats’ candidate on track to win second term in office, according to preliminary results.

Left-leaning incumbent Zoran Milanovic won 49% of the votes, while his main challenger, Dragan Primorac claimed just 19%.