Horvat reached the quarter-finals of the
2016 International Darts Open, defeating
Ricky Evans,
Gerwyn Price and
Ian White before being eliminated by
Kim Huybrechts. Horvat qualified for the
2017 PDC World Darts Championship after defeating Stefan Stoyke 10–6 in the final of the finals event. He beat
Russia's
Boris Koltsov in a sudden-death leg in the preliminary round, but was then beaten 3–0 by
Simon Whitlock in the first round. In March 2023, Horvat won
Challenge Tour 9, whitewashing
Christian Kist 5–0 in the final. In November, he qualified for the
2024 PDC World Darts Championship after beating Pascal Rupprecht 8–3 in the . He lost 0–3 to
Mike De Decker in the first round. In 2025, Horvat won a second Challenge Tour title at
Challenge Tour 6, defeating
Ted Evetts 5–4 in the final. ==World Championship results==