Major League Baseball will experiment with the strike zone challenge system at the game's highest level during spring training in 2025.

"There's going to be a test at the Major League level during spring training next year," commissioner Rob Manfred told the YES Network. "We're going to test the challenge system with big-league players." 

There was no indication of future plans beyond spring training.

The challenge system differs from the automated ball-strike system and serves as something of a compromise between full automation and the current human approach. 

Under the challenge system, each team is afforded three contested calls per game that are quickly checked against technology.