Early Experiments and Growing Pains: When the ABS system was first introduced in the Atlantic League in 2019, it garnered significant attention for its accuracy but also faced logistical challenges. Players and coaches remarked on the precision of the calls, but there were complaints about the system's inability to adjust for game nuances, such as pitches just brushing the edges of the strike zone that might traditionally be called balls.

Example: In one game, a pitch barely skimmed the top edge of the strike zone, leading to an awkward strike call. While the call was technically correct, both the batter and the catcher appeared surprised. This highlighted the need for the system to align better with the traditional "spirit" of the strike zone.

The "Challenge" System in Triple-A: In 2023, the ABS challenge system was introduced in select Triple-A games. Players had the ability to challenge umpire calls, and the system provided immediate feedback. This was generally well-received, as it struck a balance between human oversight and technological accuracy.

Example: During a game between the Las Vegas Aviators and Reno Aces, a batter challenged a called third strike on a pitch at the bottom edge of the zone. The ABS system showed the ball missed the strike zone by a fraction of an inch, overturning the call. Fans applauded the quick resolution, which took less than 10 seconds.

Impact on Catchers and Pitch Framing: One of the most profound effects of the ABS system has been on the role of catchers. Traditionally, elite pitch framers could influence umpires by subtly presenting borderline pitches as strikes. With ABS in place, this skill became less critical.

Example: In the Pacific Coast League, one catcher noted that he stopped focusing on framing altogether and instead prioritized blocking pitches and managing the running game. "It's freeing in some ways," he said, "but I miss the artistry of framing."

Adjustments by Pitchers: Pitchers have had to adapt their strategies when ABS is in play. They now know that the precise strike zone leaves no room for "getting the benefit of the doubt." This has led some to improve their command and focus on hitting specific parts of the zone.

Example: A pitcher for the Salt Lake Bees shared that the ABS system forced him to refine his control. "You can't nibble at the edges and hope the ump gives it to you," he said. "If you're going to throw a strike, it has to be an actual strike."

Player Reactions: While many players appreciate the accuracy, others have voiced concerns about how ABS affects the flow and feel of the game.

Positive Feedback: "It takes the guesswork out," said a hitter in Double-A. "You know if it’s a strike or not, and that gives me confidence at the plate."

Criticism: Another player in Single-A argued that the system "feels too robotic" and detracts from the human element that makes baseball unique.

Fan Experience: The introduction of ABS has been a mixed bag for fans. While some appreciate the fairness and consistency, others lament the loss of the traditional drama of arguing balls and strikes.

Example: At a game in the Florida State League, a fan said, "I like that it’s fair, but I miss seeing the manager come out and argue with the ump. That’s part of the fun."

Data Insights and Analytics: Teams have also benefited from the ABS system’s data, which provides a more granular understanding of pitcher tendencies and hitter weaknesses.

Example: After one season using ABS, a Minor League team discovered that one of their top prospects consistently struggled with high fastballs in the strike zone. Using this data, they tailored his training program to address the issue.

Challenges in Defining the Strike Zone: One ongoing debate is how to define the strike zone for ABS. While the rulebook strike zone is clear, traditional umpiring often interprets it differently.

Example: In the Southern League, several players complained about the high strike calls, noting that pitches that were rarely called strikes by human umpires were consistently being called by ABS. "It's technically correct, but it's not what we're used to," one player said.

The Psychological Factor: Players have also highlighted the mental adjustment required to trust the system.

Example: A hitter in the Eastern League shared a story about hesitating on a pitch he thought was a ball but didn’t challenge the call. After seeing the ABS confirmation that it was outside the zone, he vowed to trust the system more in the future.

Future Implications for MLB: The lessons learned in the minors are shaping the MLB's approach to ABS. The challenge system, in particular, has gained traction as a compromise that preserves the human element while leveraging technology.

​The stories from Minor League Baseball reveal both the promise and the complexities of implementing an automated strike zone. As MLB prepares for broader testing, these experiences will play a critical role in refining the system for the big leagues.