MLB Introduces 'Robot Umpire' Challenge System

New automated ball-strike system allows players to appeal umpire calls

Mar. 23, 2026 at 7:07pm by Ben Kaplan

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Major League Baseball is implementing a new Automated Ball-Strike (ABS) system that allows players to challenge umpire calls on balls and strikes. Each team will get two challenges per game, plus an additional challenge if the game goes to extra innings. Successful challenges will be retained, while unsuccessful ones will be lost. The system aims to bring more technological precision to the game, but researchers warn it could create tension with baseball's culture and history.

Why it matters

The introduction of the ABS challenge system represents the continued integration of technology and artificial intelligence into professional sports. While it aims to improve the accuracy of ball and strike calls, it also raises questions about how new technology will impact the traditional culture and decision-making processes in baseball.

The details

The ABS system will not use actual robots behind home plate. Instead, each team will be issued a pair of challenges that can be used to appeal the home plate umpire's ball-strike calls. If a challenge is successful and the call is overturned, the challenging team retains the challenge. If the challenge is unsuccessful, the team loses that challenge. There are some limitations, such as only the pitcher, catcher or batter being able to initiate a challenge by tapping the top of their head.

  • The new ABS challenge system will debut on Opening Day, March 26, 2026, when the San Francisco Giants host the New York Yankees.

The players

Malte Jung

An associate professor of information science at Cornell University who studies the tension that arises when technological precision is applied to the ambiguities of human decision-making in sports.

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What they’re saying

“Introducing technology into baseball isn't like bringing a robot into a manufacturing line. You're bringing technology into a game that has a culture and a history, with an audience in the millions.”

— Malte Jung, Associate Professor of Information Science

What’s next

The league will closely monitor the implementation of the ABS challenge system during the 2026 season to assess its impact on the game and make any necessary adjustments for future seasons.

The takeaway

The introduction of the 'robot umpire' challenge system in MLB represents a significant technological shift in a sport with deep traditions. While it aims to improve accuracy, it also raises questions about how new AI-powered systems will integrate with the culture and decision-making processes that have defined baseball for generations.