
MLB's ABS: How Automated Balls and Strikes Will Reshape 2026
MLB will deploy the Automated Balls and Strikes (ABS) system this season, keeping a human plate umpire but enabling rapid challenges: each team gets two challenges per game, with an additional challenge in extra innings; if a challenge overturns a call, the result stands and challenges don’t accumulate. ABS reviews take precedence over other reviews on overlapping plays. The system uses a defined strike zone (the K zone) and includes safeguards against cheating. Catchers, pitchers, and fans will see changes in strategy and viewing as calls are reviewed more often.
