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MLB Unveils New Challenge System for Umpire Calls

3/24/2026

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Summary

Teams Challenge Umpire Calls

The MLB will introduce the Automated Ball-Strike (ABS) Challenge System this season to let teams challenge umpire calls.
Each team can appeal two calls per game, with extra innings offering additional challenges if appeals fail.
The ABS strike zone narrowed from 19 inches wide in 2022 to 17 inches wide.
The top of the zone was adjusted from 51% to 53.5% of a batter's height in response to pitcher feedback.

Summary

Gausman and Hendricks Adapt

The Automated Ball-Strike System (ABS) will debut in the upcoming MLB season, using Hawk-Eye to measure the strike zone.
Pitcher Kevin Gausman and Pitcher Kyle Hendricks have tallied many called strikes on pitches outside the zone, signaling shifts in game dynamics.
Statcast data show fewer incorrect calls, with 1.6% of pitches outside the zone ruled strikes last year.
The Yankees will face the Giants in the first game using ABS.

History

Historical Context

Major League Baseball (MLB) adopted the designated hitter rule in 1975, enhancing offensive play and leading to an average of 4.5 runs per game by 1980. The introduction of the Automated Ball-Strike (ABS) Challenge System, set for the 2026 season, aims to improve call accuracy, responding to a 2024 poll where 61% of team personnel favored such technology to address umpire errors.

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Teams Challenge Umpire Calls

The MLB will introduce the Automated Ball-Strike (ABS) Challenge System this season to let teams challenge umpire calls.
Each team can appeal two calls per game, with extra innings offering additional challenges if appeals fail.
The ABS strike zone narrowed from 19 inches wide in 2022 to 17 inches wide.
The top of the zone was adjusted from 51% to 53.5% of a batter's height in response to pitcher feedback.

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