MLB umpires

A called strike two was overturned after a manager challenged the call under Major League Baseball's automated ball-strike system, which reviews ball and strike decisions in real time. The system, being tested this season as part of MLB's effort to improve umpiring accuracy, changed the pitch to a ball. It is among the clearest signs yet of how ABS challenges are altering games.

A strike-one call was reversed following a challenge to the Automated Ball-Strike system, with the pitch ruled outside the zone on review. It is one of the early instances of Major League Baseball's ABS challenge system changing a call mid-at-bat, and fans are debating how often the technology should be allowed to overturn human umpires' judgment.

An umpire's strike call was overturned and ruled a ball after a challenge to Major League Baseball's Automated Ball-Strike system, marking a notable moment as the league expands the use of robot officiating to review close pitch calls.

MLB teams and players are being ranked on their use of the automated ball-strike (ABS) challenge system in 2026. The tracker follows how often clubs contest umpire calls and how successful their challenges are, as the robot-umpire system continues its league-wide rollout. Attention is on which managers and hitters are adapting best to the new technology.