Thursday's Cactus League game between the Los Angeles Dodgers and Chicago Cubs will be more than just the first spring training game of 2025. It'll also be a bit of baseball history: For the first time since MLB first began testing the technology in independent ball more than half a decade ago, robo-umps will be in use for a big-league contest.

Starting Thursday at Camelback Ranch, where the Dodgers and Cubs will open Cactus League play, the ABS challenge system will begin being implemented.

MLB will be testing an automatic balls and strikes challenge system this spring training. Here's how it works.