MLB will allow players to challenge balls and strikes starting in 2026

Taylor Walls of the Tampa Bay Rays argues with umpire Adam Hamari after being called out on strikes during a game against the Cincinnati Reds on July 27, 2025.

With a tap of their head, players will be able to trigger an automated review when they disagree with an umpire's call. In spring training this year, just over half of challenges were successful.

(Image credit: Dylan Buell)