Are MLB's older umpires in danger?
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Calling Balls/Strikes from Behind the Mound? Follow an Easy Safety Tip, Blog
Safe at home? Social distancing difficult around MLB plates - The Sumter Item
Umpire positioning part of the new baseball dynamic – Diamond Nation
Rise of the Robo-Umps
World Baseball Softball Confederation
Pandemic should force changes for better in world of sports
MLB's experiments in minor league include longer pitching distance, 'robo-umps'
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