Background and Testing

Major League Baseball disclosed that the Automated Ball‑Strike System (ABS) will be introduced for home‑plate calls starting in the 2026 season. The league has already evaluated the technology in several settings, including minor‑league games, spring training sessions, and the 2025 All‑Star Game. These trials demonstrated that the system can reliably track pitches and determine whether they fall within the strike zone.

How the System Works

ABS relies on a network of twelve Hawk‑Eye cameras positioned around the field. These cameras feed high‑resolution data to a processing unit connected to a private 5G network operated by T‑Mobile. The system calculates the exact location of each pitch relative to a strike zone that is calibrated for each batter’s height and stance. When a player challenges a call, ABS reviews the pitch and issues a verdict within roughly fifteen seconds.

Challenge Protocol

Each team is allotted two challenges per game. Only the pitcher, catcher, or batter may request an ABS review. If a challenge results in an overturned call, the team does not lose a challenge. This challenge format preserves the strategic element of the game while providing a technological safety net for disputed calls.

Implementation Timeline

The league plans to roll out ABS in the 2026 regular season. While the technology will handle challenged calls, human umpires will continue to make all other calls on the field. This hybrid approach reflects MLB’s intention to improve accuracy without fully replacing human officials.

Leadership Perspective

Commissioner Rob Manfred emphasized that player preference for the challenge format was a key factor in the league’s decision. The ABS system is intended to address frequent criticism of human umpire calls while maintaining the traditional flow of the game.

Impact on the Game

By providing a consistent, data‑driven strike zone, ABS aims to reduce disputes over ball‑and‑strike calls, a common source of frustration for players and fans. The system’s selective use—limited to challenged calls—balances technological precision with the human element that defines baseball’s character.

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