
The Automated Ball-Strike System (ABS) is a long awaited feature to MLB games coming to regular season and postseason play for the first time. It has been used twice now in Spring Training play to the appreciation of many players and fans alike. Recently, I had the opportunity to sit in on a meeting with an MLB executive (who I will grant anonymity for the time-being) detailing the new addition going over fan and player reactions, time of game affects, and some new rules for the system debuting at the Major League level. These are my findings.
Early Results
In Spring Training this year, MLB found that it had similar results that they saw in Triple-A testing. They saw an estimated 4 challenges per game with about a 50% overturn rate. They also found that in Spring Training, MLB players used challenges consistently throughout the game rather than strategically in the 9th inning like Triple-A players. As MLB players grow more accustomed to the system it will be interesting to see if that statistic will change as the season goes on. The league believes that the ABS strike-zone which accounts for even a tiny slice of the baseball hitting zone could slightly reduce strike-out rates and potentially raise walk-rates. According to Baseball Reference, early results in the 2026 MLB Season have shown both walks per 9 and strikeouts per 9 going up slightly with walks per 9 going from 3.2 last season to 3.8 this season, and strikeouts per 9 going from 8.5 to 8.7 this season. As of writing this, the season is only a couple weeks old and these stats could change exponentially by late September, but it should be noted that there has not been a drastic change in either statistic to date. These numbers could change as players get more familiar with the ABS strike-zone. To this date according to Baseball Savant’s ABS challenge Dashboard, 55% of challenged calls have been overturned with 971 challenge attempts. Pitchers and Catchers account for 522 of those challenges with them having a staggering 61% overturn rate while batters have challenged 449 times with a 47% overturn rate.
Impact On Speed Of Play
According to the league, time added to the game is rather insignificant even with the added challenge system. In Triple-A, players challenged 4.2 times per game with an average of 16.1 seconds added on per challenge resulting in just an extra 1 minute and 8 seconds added to game time. In the MLB spring tests, these numbers are even smaller as MLB players challenged at approximately the same clip at 4.1 challenges per game with an average 13.8 seconds used to challenge calls. This results in less than a minute added to game time at just 57 seconds. So far in the early season, time of game also has not gone up by exponential numbers. According to Baseball Reference, in 2025 the average length of game was 2 hours and 40 minutes while in 2026 that number has risen to 2 hours and 45 minutes. This number cannot entirely be explained by the pitch clock. So far in 2026, the number of extra inning games has gone up by almost half a percent which will naturally make the average length of game longer especially in a sample size as small as the one we have currently. Over a full season in 2025, the percentage of games that went to extra innings was 8.60%. that number so far in 2026 has gone up to 9.05%. I would expect that number to even out closer to 2025 numbers which will likely show in the average time of game.
Fan And Player Feedback
In a survey sent the fans by MLB asking fans: “what impact is the use of ABS technology having on your experience at this game?” The response from fans was overwhelmingly positive. 72% of fans surveyed said the ABS technology was making a very or slightly positive impact on their experience at the game while on 10% of surveyed fans said it had a very or slightly negative impact on their experience at the game. Interestingly enough, 18% of fans surveyed said that ABS technology had no impact on their enjoyment of the game. For player feedback, the league sent out a survey to Minor League players asking them: “Which game format do you like best?” 60% of Minor League players surveyed answered with the ABS challenge system. 24% of players surveyed said they preferred a full umpire-called game while 16% said they preferred a full ABS system. Once this season ends it will be intriguing to see the reaction from Major League players and if this could even have an effect on Collective Bargaining negotiations for the 2027 season.
Where Do We Go From Here?
So far in 2026, the ABS challenge system seems to be a resounding success. It has helped make it so egregious calls no longer have an affect on the outcome of a game like it used to be (thank you Angel Hernandez and CB Bucknor). By season’s end we should see the system being used more strategically as it has been used in Triple-A and Major League players will likely adjust to this system as they have with the pitch clock. The question then becomes: what’s next? Will MLB go even further eventually and have a full ABS called game? Will they add more challenge systems for calls that are currently deemed “judgement calls”? The league is always expanding in ways that could better or potentially hinder the watching experience, but so far, ABS has been a God send in a league where games used to be decided on a CB Bucknor coin flip strikeout.
