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Umpiring

Challenges Challenge Mechanism Challenge System Check Swing Challenges Umpire Challenges Ball-Strike Calls Ball-Strike Challenges Robot Umpires

MLB’s ABS Challenge System Overturns 54% of Appeals as Umpires Bristle

Early results suggest real-time checks are reshaping behavior.

ABS Era Arrives: Spring Games Show Flurry of Overturns as MLB Finalizes Player‑Specific Strike Zone

MLB Adds Broadcast Delays, Curbs Strike-Zone Graphics for ABS Rollout