New for 2025: MLB’s Automated Strike Zone Challenge System
Big changes are coming to the Cactus League this year, as Major League Baseball will be testing an automated strike zone challenge system in select games. This cutting-edge technology will be in play for about 60% of spring training games, giving fans a first look at potential future rule changes.
“The Cactus League has always been a testing ground for MLB innovations, from the pitch clock to instant replay,” said Cactus League Executive Director Bridget Binsbacher. “This will be an exciting addition for fans and a unique way to see baseball’s future unfold in real time.”
If you’ve ever disagreed with a call behind home plate, this new system will give teams the opportunity to challenge certain ball-and-strike decisions—just like instant replay.












