Major League Baseball (MLB) is taking significant steps toward integrating technology into its officiating with the introduction of the Automated Ball-Strike System (ABS), colloquially known as “robot umpires.” This system was tested during the 2025 Spring Training games, marking a pivotal moment in the sport’s evolution.

The ABS utilizes Hawk-Eye technology to track pitches and determine their position relative to a standardized strike zone. In the current testing phase, human umpires continue to make initial calls, but players now have the option to challenge these decisions. Each team is allotted two challenges per game, which can be initiated by the batter, catcher, or pitcher through a simple tap on their helmet or cap immediately after a call. If a challenge is successful, the team retains its challenge; if not, it is forfeited. This system aims to enhance the accuracy of calls while preserving the traditional role of umpires.

The ABS has been in development since 2019, with trials conducted in various minor leagues. In 2024, Triple-A games employed the challenge system full-time, yielding a 51% success rate for challenges. The strike zone used by ABS is a two-dimensional rectangle over the middle of home plate, adjusted for the batter’s height. This differs from the traditional three-dimensional zone and has sparked discussions about redefining the strike zone to align with the new technology.

Reactions to the ABS have been mixed. Some players appreciate the increased accuracy and the strategic element of challenges. However, concerns have been raised about the impact on catcher framing—a skill where catchers subtly adjust their glove to influence the umpire’s call. Yankees manager Aaron Boone has expressed reservations, suggesting that the system diminishes the art of catching and could lead to internal team conflicts over challenge usage.

Despite these concerns, MLB Commissioner Rob Manfred supports the continued testing of the ABS, with the possibility of implementing it in regular-season games as early as 2026. The league is carefully evaluating the system’s effectiveness and its reception among players and fans. The integration of technology like the ABS represents a significant shift in baseball, aiming to balance the game’s rich traditions with modern advancements to enhance fairness and accuracy. 

Bob Eres worked for a company years ago which graded the Home Plate Umpires on their calls behind the plate.  He said that “99% of the time the Umpires were spot on and made the right calls”.

Credits go to MLB and the New York Post for some of the content in this article,