In February 2013 he played in his first World Cup of Darts, representing Croatia alongside Tonči Restović and they advanced from Group G courtesy of a 5–3 victory over New Zealand. They survived two match darts from Northern Ireland in the last 16 to win 5–4 and face the Belgium brothers Ronny and Kim Huybrechts in the quarter-finals. Restović lost to Kim and Marijanović lost to Ronny 1–4 to expel Croatia from the tournament. In September 2014, Marijanović qualified for the European Darts Grand Prix and was beaten 6–2 by Ryan de Vreede in the first round. He won the Bulls Superleague Eastern Europe Play-Offs to earn a place in the preliminary round of the 2015 World Championship with a 10–7 victory over Boris Krčmar. He survived three match darts from Jermaine Wattimena to beat him 4–3, but lost the first six legs of his first round game against Stephen Bunting to be 2–0 down. Marijanović took the next set before Bunting took the fourth without reply to win 3–1.