SerpApi.Org
Every challenge made by a Major League Baseball player through the Automated Ball-Strike System lasts only a few seconds, but each review represents a clash between baseball tradition and modern technology. On one side stands the home plate umpire, a professional who spent decades developing instincts behind the plate. On the other is a system that relies only on data, positioning and precision, without reputation or experience influencing the result.
The introduction of the ABS system has not removed human involvement from baseball. Umpires still make every call at home plate, but players now have the ability to immediately challenge those decisions. Within seconds, radar technology installed at MLB stadiums determines whether a pitch crossed the strike zone, allowing the game to correct calls that once depended entirely on the human eye.
The first months of the 2026 MLB season have revealed a noticeable difference in how umpires are adapting. According to data from TapToChallenge, a platform that tracks ABS challenges, older umpires have seen a higher percentage of their ball-and-strike decisions overturned compared with their younger counterparts.
The numbers show that umpires under the age of 40 have had 50.1% of challenged calls overturned, while officials between 40 and 49 years old have seen that number rise to 54%. Among umpires aged 50 or older, the rate increases to 57.2%, and those 55 and above have the highest percentage at 58.2%.
The trend is also visible in how often players choose to challenge calls. Veteran umpires are being tested more frequently, suggesting that hitters, pitchers and catchers are identifying which officials may be more likely to have their decisions overturned by the technology.
One of the clearest examples came with veteran umpire CB Bucknor, who experienced a difficult outing earlier this season. The 63-year-old official had six calls overturned by ABS in one game, including a sequence where two consecutive strike calls were corrected by the system. What once might have been forgotten during a long season is now displayed instantly on stadium screens in front of thousands of fans.
Another veteran facing major scrutiny is Andy Fletcher. The 59-year-old umpire has seen 38 of 54 challenged calls overturned, a reversal rate of 70.4%, the highest among umpires with at least 900 called pitches this season. Meanwhile, several younger umpires who developed through the minor leagues while working alongside ABS technology have posted significantly lower overturn rates.
The difference does not necessarily represent a decline in ability among veteran officials. Instead, it highlights a major transformation in the profession. For decades, umpires were trained to rely on positioning, experience and personal judgment. Now they must adjust to a game where every close decision can immediately be measured against a technological standard.
As MLB continues integrating ABS into everyday competition, the relationship between players, umpires and technology will remain one of baseball's biggest storylines. The system may not replace the human element, but it has created a new level of accountability—one where every ball and strike can be reviewed, challenged and judged in real time.
