MLB to test robot umpire challenge system in spring training 2023, with potential regular-season use by 2026.

MLB plans to test a robot umpire challenge system in spring training in 2023, with potential regular-season use by 2026. The league has been experimenting with automated ball-strike systems in the minor leagues since 2019, addressing concerns about the strike zone's definition and technical issues. The challenge system allows human umpires to use the robot's calls as reference while reviewing decisions.