How MLB Umpires Learned to Explain Replays to Crowds - The New York Times

MLB: Umpires will announce review decisions to crowd

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MLB, umpires agree on deal that would allow for computerized ball

Replay review and ejections - Beyond the Box Score

MLB umpires will wear mics to explain review rulings to fans

MLB Umpires to Explain Replay Review Decisions Via Microphone

Umpire calls timeout then acts like he didn't call timeout, a

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Robot umpire: Baseball edges closer to implementing automatic

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It's a Really Weird Time to Be an Umpire - The New York Times

MLB doubles camera angles for video reviews of umpires

Upon further review, instant replay a mixed bag

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