ABS has arrived at Goodyear Ballpark where the Guardians and Reds play their Cactus League home games this spring. It was on display Saturday when the Guardians and Reds opened the spring season against each other.

ABS is MLB’s name for an automated strike zone — also known as robot umps. In a full ABS game, there will be a human umpire behind the plate, signaling the calls communicated through ABS. We won’t be seeing that full system in action this spring. Instead, teams will have a limited amount of challenges.

Starting Thursday at Camelback Ranch, where the Dodgers and Cubs will open Cactus League play, the ABS challenge system will begin being implemented.