What is Automated Ball Strike System and how does it impact MLB spring training?

The Automated Ball-Strike System (ABS) is the latest experiment of MLB. With the aim to enhance the game’s integrity while redefining competitive play, the challenge system was introduced by MLB during the 2025 spring training. The technology enhances the accuracy of the umpire calls accuracy during the games while allowing players to challenge the strike and ball-made calls. In the bid to reduce human error while maintaining the traditional elements of the game, the ABS has been tested in Minor Leagues since 2022.
With the Chicago Cubs and Los Angeles Dodgers being first to use it, the system is already sparking discussion on its potential impact on baseball.

The ABS challenge system is a cutting-edge technology that follows a hybrid approach combining human umpiring with technology. The system employs the Hawk-Eye tech to track exact location of the pitches, relative to the strike zone of batter, in real-time. During the spring training, the players such as pitchers, batters and catchers can initiate a challenge by just tapping their cap or helmet, immediately after the call.

Each team is granted 2 challenges per game. It will be retained if successful but lost if the call stands. The strategic element is designed to maintain the game's traditional dynamics while ensuring crucial calls are accurate.
During the spring training, the ABS was implemented in 13 ballparks— Grapefruit and Cactus League. In the debut, the system overturned 51% of the challenged calls in Minor League testing. It added only approx. 17 seconds per challenge. Such minimal delay ensures that a game's pace remains unaffected. The goal of it is to offer fairer outcomes in the moments of high without disrupting the game's flow.
While the ABS challenge system isn't slated for the 2025 regular season, the technology's success in the spring training could pave its way for adoption in the near future. The system addresses long-standing complaints about umpire accuracy while attempting to modernize baseball without losing the human touch. Players have shown interest in the system, as it offers them a tactical tool to correct potential errors that can influence the outcome of a game.

While not all favor the full automation of ball and strike calls, the ABS challenge system strikes a balance, preserving the human umpires' role. The initiative further reflects the commitment of MLB to the evolving sport while respecting the rich tradition.
If it’s a success, ABS can find its way to the regular season games by 2026, creating a significant impact on how the game gets officiated.