Major League Baseball (MLB) is introducing robots to spring training this year on a trial basis in the form of the ABS (Alternate Ball-Strike System). ABS will peer over the home plate umpire’s shoulder to provide the right call if a team challenges the ump’s ball or strike call.

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