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MLB To Pilot Check-Swing Challenges in Pacific Coast League Beginning May 5

Bat-tracking with a 45-degree definition, alongside two retained challenges, will replace subjective checked-swing calls in the test.

Overview

  • The rollout begins May 5 in the Pacific Coast League, with Salt Lake’s first home use set for May 12, while the International League serves as a control by not adopting the system.
  • A swing will be ruled when the maximum angle between the bat head and handle exceeds 45 degrees, as measured by bat-tracking technology.
  • Teams receive two challenges per game that can be used on balls, strikes, or swings, and successful appeals are retained.
  • Previous trials in the Florida State League and Arizona Fall League produced about a 3% reduction in strikeouts, leading to more balls put in play.
  • Other Triple-A experiments this season include tighter pitch-clock procedures, PitchCom malfunctions counting as mound visits, and an International League second-base reposition later in the year.