Using the automated ball-strike system (ABS), teams will have the option to challenge ball-strike calls in the majority of spring training games.

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

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Last week we picked our own walk-up music. This week we're going to tackle the automated strike zone challenge system. Do you like the ABS challenge system? Do you prefer full robo-umps?

That is truer for the full ABS system than the challenge system, which is still based on calls by the home plate umpire. “I like the challenge system,” Astros catching coach Michael Collins said.

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The ABS challenge system is being tested during spring training games in 2025 and could be a new rule in MLB when the 2026 season rolls around.

In full ABS, every call is made for the umpire. For the first half of this season at Triple-A, full ABS was used for Tuesday-Thursday games while the challenge system was used for weekend contests.

The ABS system currently being tested follows a challenge format similar to tennis or NFL reviews. Players can contest a limited number of ball-strike calls per game, with the automated system ...

The system allows each team two challenges per game. If the challenge is upheld. the team retains it.