Exploring MLB's implementation of ABS challenge system

MLB recently shared the rules for ABS challenges. It will monitor every pitch in relation to a batter's unique strike zone. Players request a challenge by tapping their helmets. The result will instantly be shown on a video board in the stadium. The game then continues with that result.

Each team starts the game with two challenges. However, they'll receive an extra challenge for each inning of an extra-inning game. Challenges must come from the batter, pitcher or catcher. In other words, the manager and bench don't get to challenge. The challenges must come immediately and without any assistance. If the challenge is successful, the team retains it. If it's not, then it's lost for the remainder of the game.

The hope behind the ABS challenge system

The hope is that the ABS challenge system is going to act as an in-between for robot umpires and the traditional role of the home plate umpire. That way, more calls can be gotten correct without losing the human element. 

The system was tested out during spring training in 2025. It's also been used in the minor leagues since 2022. That's enough time for MLB to be comfortable with the results. In particular, it won't negatively disrupt the games going forward. Like the pitch clock, MLB hopes this will quickly be integrated into the game. *-

The ABS System is a major change. So, in a way, something is going to be lost, but it's in the name of progress. Importantly, it has also been successful in the minor leagues. That's going to work out to be a massive advantage for those young players and rookies. 

By now, players who have spent significant time in the minor leagues since 2022 know how the challenge system works. They know where their strike zones are in it. Veterans in MLB don't. That means that those veterans are going to have a longer adjustment period. A few may even need to swallow their pride and ask the young players for advice.

Every team will need to institute its own rules. Some players likely won't be allowed by their teams to challenge. Others may not want any pitchers challenging, preferring catchers to take on that responsibility. 

As time goes on, those strategies are likely going to shift based on data that comes from MLB games. In the short-term, however, it's those players and coaches with minor league experience who know how to use ABS Challenges the best.