
For the 2026 season, Major League Baseball introduced its challenge system to great fanfare, with the Automated Balls/Strikes (ABS) system serving as a backstop to overturn (or validate) calls made by the umpires.
In doing so, MLB finally formalized the definition of the strike zone - no longer would it be “knees to letters” at the discretion of umpires - now it ranges from 27% to 53.5% of the batter’s measured height.








