They're testing a ball/strike challenge system in the minor leagues - Bleed Cubbie Blue
Robo Umps” Coming to all AAA Ballparks in 2023 - Minor Leagues - Twins Daily
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Triple-A To Use Robot Umpires For 2022
Robot umpires should be the future of baseball - Vox
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MLB will use its new rules in the Arizona Fall League - Bleed Cubbie Blue
Robot Umpires at Triple-A Ballparks in 2023 - Sports Illustrated Texas Rangers News, Analysis and More
Padres 5, Cubs 0: Bring on the ball and strike challenge system - Bleed Cubbie Blue
We are getting closer to an automated ball-strike system in MLB - Bleed Cubbie Blue
Automated Ball Strike System: Sugar Land Space Cowboys now able to challenge robot umpire calls at Constellation Field - ABC13 Houston
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MLB News: 'Robo Umps' Will Make Their Debut in Triple-A in 2023 - Inside the Dodgers
How Wrigley Field got lights, night games in 1988