Automated Ball-Strike System
robot-umpire system in Baseball
The Automated Ball-Strike (ABS) System is a system that automates the interpretation of whether pitches are in the strike zone in baseball games. It is currently used by the KBO League in South Korea, and by Minor League Baseball (MiLB) and Major League Baseball (MLB) in the United States and Canada. In MLB and MiLB, it is used to enable player challenges of umpire calls of balls and strikes, while in the KBO League and previously in MiLB, it calls pitches automatically.
History
Minor League Baseball
The independent Atlantic League first used ABS, nicknamed "robot umpires", during its 2019 all-star game. Umpires used earpieces to receive ball-strike calls using TrackMan technology. Umpires could make a call based on the automated message, or could make their own call if the automated system malfunctioned or registered a call with which the umpire disagreed.
The Arizona Fall League began using ABS during its 2021 season. The technology drew complaints from players and fans for its treatment of breaking balls as strikes even when they break and drop out of the strike zone. Human umpires were obligated to make a call based on ABS, and players could be ejected if they contested a call, as with all ball-strike calls.
The Florida State League, a low-A league in Florida, used ABS in its 2021 season.
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