ACL Royals vs ACL Mariners is a regular-season Arizona Complex League baseball game between the rookie-level affiliates of the Kansas City Royals and Seattle Mariners held at the Peoria Sports Complex in Peoria, Arizona. The Arizona Complex League is a rookie developmental circuit where recently drafted players and international signees gain professional experience, so these matchups spotlight prospects and player development rather than major-league competition. The Peoria Sports Complex, which also serves as a spring-training site for MLB clubs, provides the stadium and practice facilities for these developmental contests.
