CLEVELAND, Ohio — Major League Baseball will introduce an Automated Ball-Strike Challenge System beginning in the 2026 season, allowing players to contest umpire calls on balls and strikes for the first time in the sport’s history.

The league’s joint competition committee approved the technology following extensive testing in minor league baseball and during 2025 spring training. The system will be used in all spring training games, regular season contests, and postseason play starting in 2026.

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Players can challenge

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