5 things to know about robot umpires coming to MLB
Summary
Starting in 2026, Major League Baseball (MLB) will use an Automated Ball/Strike System (ABS) for calling balls and strikes. Human umpires will still make initial calls, but players can challenge up to two calls per game to the ABS. The technology uses cameras to determine if a pitch is within the strike zone.Key Facts
- MLB will introduce robot umpires in 2026 using a system that assists human umpires in making ball and strike calls.
- The system allows each team to challenge up to two calls per game, with an extra challenge in each extra inning.
- ABS has been tested since 2019 in minor leagues, spring training games, and select other events.
- The technology uses cameras that track pitches and decide if they are within the defined strike zone.
- Only a batter, pitcher, or catcher can challenge a call, and they must signal within 2 seconds of the play.
- A successful challenge allows the team to keep their challenge opportunity.
- The strike zone used by the ABS is rectangular, matching the official rule book, unlike the more oval zone used by human umpires.
- Big league umpires are correct about 94% of the time on their calls, according to UmpScorecards.
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