ACL Mariners vs ACL Guardians is a rookie-level Arizona Complex League regular-season baseball game between the Seattle Mariners’ and Cleveland Guardians’ complex squads. It is played at Goodyear Ballpark in Goodyear, Arizona, a Cactus League spring-training venue used by major-league organizations. The matchup is part of MLB clubs’ player-development season and typically features recently drafted players and other early-career professionals.