At the conclusion of the 2012–13 season, Horvat was nominated for the Roger Neilson Memorial Award as the post-secondary player in the OHL with the best grades.

[5] In his final year of major junior hockey, Horvat helped guide Guelph Storm to the J. Ross Robertson Cup, beating North Bay Battalion 4–3.

Horvat signed his first professional contract with the Manchester Monarchs in the American Hockey League (AHL) on August 22, 2014.

As a free agent in the off-season, Horvat was signed to an ECHL contract with the Greenville Swamp Rabbits on September 17, 2019.

[14] Prior to the 2019–20 season, Horvat was added to the defending champion's Charlotte Checkers roster on a professional try-out on October 3, 2019.