MLB Tests Automated Ball-Strike System During Spring Training

The new system allows players to challenge umpire calls in real-time, with potential adoption in regular season games as early as 2026.

The Automated Ball-Strike System (ABS) is being trialed in 13 spring training ballparks, allowing pitchers, catchers, and batters to challenge umpire calls on balls and strikes.
Each team is permitted two challenges per game, which are retained if the challenge is successful, with results displayed on the stadium scoreboard within seconds.
The system has been used in minor leagues, where it has improved strike zone accuracy and reduced disputes between players and umpires.
Some teams, like the Rays, have embraced the system as a strategic and fan-friendly innovation, while others, like the Reds, are opting out of using it during spring training to focus on regular-season preparation.
The ABS system is not expected to be implemented in MLB regular-season games until at least 2026, as trials continue to refine its functionality and impact on gameplay.