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MLB Debuts Automated Ball-Strike System at All-Star Game

After its Atlanta debut, Manfred will press the league’s competition committee to approve the system for regular-season use in 2026.

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The Automated Ball-Strike System plays on the scoreboard after a pitch call was challenged during the first inning of a spring training baseball game between the Chicago White Sox and the San Diego Padres in Phoenix on February 26.
Home plate umpire Ryan Wills calls for a pitch review from the Automated Ball-Strike System during a spring training baseball game between the Boston Red Sox and Pittsburgh Pirates.
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Overview

  • High-speed cameras provided a height-based rectangular strike zone measured between 53.5% and 27% of each batter’s height in Tuesday night’s midsummer classic.
  • Under the new challenge framework, pitchers, catchers and hitters can tap their cap or helmet twice to contest calls, with each team allotted two challenges and able to retain successful ones.
  • The system has undergone trials in minor league venues and spring training since 2019 before its first MLB deployment.
  • Commissioner Rob Manfred will formally propose the Automated Ball-Strike system to the 11-member Joint Competition Committee later this summer for a potential 2026 regular-season rollout.
  • Reactions among players are mixed: Detroit’s Tarik Skubal plans to forgo using the system and trust human umpires, while Clayton Kershaw says he supports its accuracy but seeks clarity on individual strike-zone dimensions.