What is the ABS challenge in MLB and why is it causing accidental reviews?

• The Automated Ball Strike (ABS) system allows teams to audit decisions in real time, but the chosen gesture to activate it is clashing with players’ habits.

• Stars from the Dodgers, Yankees and Pirates have already wasted review opportunities due to involuntary touches on their helmets or caps that umpires interpret as official signals.

• The ambiguity of the universal gesture has sparked on field arguments, raising the need for verbal signaling or a less common movement in baseball culture.

The 2026 MLB season has introduced a technological dimension aimed at perfection in ball and strike calls, but the transition has not been without comical and costly situations. The ABS (Automated Ball Strike) system grants players the power to challenge the home plate umpire’s decision; however, the accepted signal to initiate this process, tapping the top of the helmet or cap overlaps with nervous tics and equipment adjustments that ballplayers have performed subconsciously since Little League. This similarity has given rise to the “accidental challenge” phenomenon, where entire teams lose their limited review opportunities due to a simple hand movement that had nothing to do with game strategy.

Theory about this very odd challenge, which was the first challenge this year to occur on the first pitch of the first inning.

Ohtani went to fix his hat, but Smith thought he wanted him to challenge so Smith tapped his head. Weird one. pic.twitter.com/U9ObTByXC8

— Jake Mintz (@Jake_Mintz) April 8, 2026

The Ohtani incident and home plate confusion

One of the first cases to raise alarms occurred during a matchup between the Los Angeles Dodgers and the Toronto Blue Jays, involving superstar Shohei Ohtani and catcher Will Smith. Following a pitch that was clearly outside the strike zone, Smith instinctively tapped the top of his helmet, which umpire Dan Bellino immediately interpreted as a formal review request through the ABS system. The confusion was total, as it made no tactical sense to challenge a ball that had already been called in the pitcher’s favor, suggesting that the gesture was merely an equipment adjustment misinterpreted by the rigidity of the new officiating protocol.

The Yankees and Ben Rice’s frustration

The trend continued to manifest more clearly during a duel between the Rays and the Yankees, where New York first baseman Ben Rice fell victim to his own habit after a strikeout. As he headed toward the dugout, Rice adjusted his helmet in the usual manner, an action that Bellino again behind the plate, took as an official challenge to the player’s dismay, who tried in vain to explain that he had no intention of contesting the play. The original decision stood after the technological review and the Yankees wasted their first challenge of the afternoon, leaving Rice with a look of disbelief at a rule that seems to penalize the muscle memory of athletes.

The Pirates’ stroke of luck and Bubba Chandler

Not all accidental challenges have ended in sporting tragedy, as demonstrated by Pirates pitcher Bubba Chandler during a game against the Chicago Cubs. While facing Moisés Ballesteros, Chandler made the gesture of touching the back of his cap to adjust it, which accidentally triggered the ABS audit system by order of umpire Alan Porter. To everyone’s surprise, the technology corrected the initial decision and transformed a ball into a called strike, allowing the right hander to secure the strikeout on the next pitch; despite the positive outcome, Chandler jokingly clarified at the end of the inning that his only goal was to fix his attire.

The urgent need for a new protocol

These incidents have sparked a necessary debate about the viability of physical gestures in a sport filled with constant rituals and uniform adjustments. Managers have already begun to express their discomfort, and there have even been ejections over arguments related to the speed or legitimacy of these challenges, suggesting that the current system is prone to human error in its most basic form. A logical solution, already echoing in expert circles, would be to mandate clear verbal communication or replace the helmet tap with a radically different gesture that is not part of a ballplayer’s natural behavior on the field, thus preventing a game’s fate from depending on an untimely cap adjustment.