Minor League Baseball will expand trials of a new rule that allows players to challenge balls and strikes using an automated ball-strike system if they think the umpire missed the call.
The MLB Needs To Implement This Strike Zone Challenge Technology Immediately
Are robot umpires ready for their MLB debut? Not so fast. - The Athletic
Explaining ball-strike challenge system
Players who went directly from the Draft to MLB
Minor League Baseball to Trial Ball-Strike Challenges
Watch how minor league strike zone challenge system works
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