Susac attended Jesuit High School in Carmichael, California, a suburb of Sacramento, where he played football and baseball.

[7] He slashed .335/.383/.591 with 12 home runs, 64 RBIs, and 24 doubles, earning the title of Pac-12 Conference Freshman of the Year as well as being named All-Conference and to the All-Defensive Team.

[10] Susac returned as Arizona's starting catcher in 2022 and entered the season as a top prospect for the upcoming draft.

[13] He finished the season having appeared in 64 games, compiling a .366/.430/.582 slash line with 12 home runs, 61 RBIs, and 100 hits.

[17] Susac made his professional debut with the Arizona Complex League Athletics and was promoted to the Stockton Ports after two games.