A computerized system that calls balls and strikes is being tested during Major League Baseball spring training exhibition games starting Thursday after four years of experiments in the minor leagues.

Though this hybrid umpire system won’t make its way to regular season major league games in 2025, player and fan reactions during this crucial trial period could determine whether or not it becomes a regular staple in games.

The Major League Baseball (MLB) robot umpires won’t be rolled out for every game this spring, but they will be in play for Friday’s matchup between the Tampa Bay Rays and the New York Yankees at Steinbrenner Field in Tampa,