Here are Major League Baseball's ABS firsts
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The 2026 baseball season is underway, which means that the Automated-Ball Strike (ABS) Challenge System, powered by T-Mobile, is getting its first official use at the Major League level.
In light of the historical significance, MLB.com will be keeping a running list of ABS firsts -- beginning, of course, with the first challenge ever issued in a regular season Major League Baseball game.
First challenge
Date: March 25, 2026
Game: Yankees at Giants (4th inning)
Player: José Caballero (NYY), batter
The first official ABS challenge was issued by Yankees shortstop Caballero on a first-pitch called strike from Logan Webb. The call on the field was upheld.