[1][2] After one year at Menlo, the Milwaukee Brewers selected Erceg in the second round, with the 46th overall pick, of the 2016 Major League Baseball draft.
[4][5] Erceg finished his first professional season with a .327 batting average, nine home runs and 51 RBI in 68 total games between both teams.
[9] He spent 2019 with the San Antonio Missions of the Triple–A Pacific Coast League,[10] slashing .218/.305/.398 with 15 home runs and 52 RBI over 116 games.
[13] Erceg split the 2022 season between Biloxi and the Triple-A Nashville Sounds, pitching in 49 games and registering a 3-4 record and 4.55 ERA with 69 strikeouts and 2 saves in 61+1⁄3 innings of work.
[20] On July 30, 2024, the Athletics traded Erceg to the Kansas City Royals in exchange for Mason Barnett, Will Klein, and Jared Dickey.