In 2022, he became the first man to win a bronze medal in a solo male artistic swimming event at a LEN European Aquatics Championships, winning the bronze medal in the solo technical routine at the 2022 European Aquatics Championships.

[1][2] At the 2022 European Aquatics Championships, held in August in Rome, Italy, solo male artistic swimming events were included in the program for the first time.

[3][4] On the second day of competition, 12 August, Martinović scored 58.8834 points in the final of the first solo male event, the solo technical routine, and won the bronze medal, which made him the first male artistic swimmer to win a bronze medal in a solo event at a LEN European Aquatics Championships.

[11][12][13] With his fourth-place finish, he became the first man to compete in the solo free routine at a LEN European Aquatics Championships, place, and not earn a medal.

[14] In his third and final event, the mixed duet technical routine the following day, he and partner Jelena Kontić placed fifth with a score of 68.1061 points, which was 7.4853 points behind the duo of Jozef Solymosy and Silvia Solymosyová from Slovakia who won the bronze medal and 21.2618 points behind Giorgio Minisini and Lucrezia Ruggiero of Italy who won the gold medal.