MLB Commissioner Rob Manfred revealed that Major League Baseball aims to test robot umpires using a challenge system during spring training in 2025, with potential full implementation in 2026. However, technical issues regarding the strike zone definition need resolution before testing at the major league level. Feedback from players has favored the challenge system over full automation, which influenced MLB's decision to switch exclusively to the challenge system in Triple-A ballparks starting June 25, 2023. The challenge system, similar to the one used in professional tennis, allows teams to review a limited number of calls per game. Manfred emphasized the importance of thorough testing to ensure the technology is fully ready for major league use.