MLB Expands Automated Ball-Strike Challenge System for 2026

PHOENIX — Major League Baseball is stepping up its commitment to technological innovation on the field with the introduction of an automated ball-strike (ABS) challenge system in 13 spring training stadiums. This year, more than 60% of games in both the Cactus and Grapefruit Leagues will feature this new system, as MLB gathers data to assess its readiness for the regular season in 2026.

How the Automated Ball-Strike Challenge Will Work

The new system was previously tested in the minor leagues and has shown promise. The rules for the challenge system in spring training are as follows:

• Teams will be allowed two challenges per game, and any successful challenges will be saved for later in the game.
• Only specific players—batters, catchers, and pitchers—can initiate a challenge, which must be done immediately after the umpire’s call. Players indicate a challenge by tapping their hat or helmet quickly.
• The outcome of each challenge will be displayed on the scoreboard and broadcast on television for transparency and fan engagement.

Participating Teams and Venues

The five dual-team stadiums in Arizona, which host teams from both leagues, will incorporate the ABS challenge system. These include:

• Seattle Mariners/San Diego Padres
• Chicago White Sox/Los Angeles Dodgers
• Kansas City Royals/Texas Rangers
• Cincinnati Reds/Cleveland Guardians
• Colorado Rockies/Arizona Diamondbacks

In Florida, the following eight teams will also use the system:

• Toronto Blue Jays
• Detroit Tigers
• New York Yankees
• Pittsburgh Pirates
• Philadelphia Phillies
• New York Mets
• St. Louis Cardinals/Miami Marlins

All games in these stadiums will employ the challenge system, allowing MLB to gather comprehensive data and insights.

Moving to Triple-A

MLB’s ambitions don’t stop at spring training. The challenge system will also be used during the 2025 Triple-A baseball season. By extending its testing to the highest level of minor league play, the league aims to gather even more information to make a well-informed decision about implementing the system in the major leagues.

League’s Approach and Player Preferences

League officials are actively encouraging players to use the challenge system frequently during spring training. Initial experiments in the minors indicated that players and fans alike prefer a challenge system that incorporates automation selectively rather than completely automating every pitch call.

This approach seeks to balance accuracy and fair play with the traditional elements of baseball that fans cherish, such as the ability of catchers to influence pitch calls through framing.

System Efficiency and Testing Outcomes

Preliminary data from the minor leagues suggests that challenges take approximately 17 seconds to resolve. Experiments also showed an overturn rate of about 50%, with an average of 3.9 challenges per game.

Following the spring training and Triple-A testing phases, MLB’s competition committee will use the gathered data, along with feedback from players, coaches, and umpires, to evaluate the feasibility of the automated ball-strike system for the 2026 regular season and postseason.

The First Automated Ball-Strike Challenge Game

The introduction of the new system into regular ballgame scenarios begins with the first challenge game, scheduled for Thursday at Camelback Ranch in Glendale, Arizona. The game will feature a matchup between the Los Angeles Dodgers and the Chicago Cubs, setting the stage for a significant technological test in baseball.

Implications for Baseball

The potential integration of the ABS challenge system into major league play could significantly reduce the number of controversial pitcher-batter confrontations due to incorrect ball and strike calls. It also promises to minimize disruptions to the game, allowing players to maintain their focus on performance rather than challenging calls constantly.

However, the system faces the challenge of balancing the excitement and unpredictability that human umpiring brings with the precision of technology.

Conclusion

MLB’s cautious yet eager approach to implementing the automated ball-strike challenge system reflects its commitment to enhancing the integrity and reliability of game calls while respecting and preserving the tradition of human umpiring. As the league collects data and feedback over the coming spring and regular seasons in the minors, fans and players will be closely watching to see if this system can meet the high standards of baseball.

The evolution of baseball through the integration of technology and human expertise is an exciting prospect for the future of the sport. As fans, we should keep an open mind and provide our thoughts on how we believe this system could work to improve our favorite game.

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