MLB to use robo-ump challenge system league-wide in 2026 season
NEW YORK, NY – Major League Baseball is officially going all in on tech for balls and strikes — announcing that the Automated Ball-Strike Challenge System (ABS) will be implemented across the league for the entire 2026 season.
The high-tech system, powered by the T-Mobile 5G network, uses multiple cameras positioned around the field to track pitch location in real-time. Players and fans will see the results of each challenge displayed instantly on the stadium scoreboard.
The ABS challenge format allows players to contest questionable calls while preserving the traditional role of the home plate umpire. Under the rules:
- Each team gets two challenges per game — and retains them if the challenge is successful
- Only the batter, pitcher, or catcher can initiate a challenge, and it must be done immediately after the pitch
- The signal for a challenge is a tap to the helmet or hat to alert the umpire
- No help from dugout personnel or teammates is permitted in making a challenge decision
- One additional challenge is granted in each extra inning if a team has none remaining
This move comes after years of testing the ABS system in the minor leagues and during select MLB games. The league says the system improves consistency and transparency while maintaining the flow and human element of the game.
The 2026 season will mark the first time in MLB history that an electronic challenge system for balls and strikes is used full-time in all regular season and postseason games.
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Key Points
- MLB will implement the Automated Ball-Strike Challenge System (ABS) across the league in 2026
- Each team gets two challenges, retained if successful, and only players on the field can initiate them
- ABS uses camera tracking and 5G tech to display real-time ball-strike decisions on the scoreboard
