10 Major League Baseball umpires retire in historic exodus
Sources - 10 MLB umps retiring, most since '99 - TSN.ca
MLB Twitter reacts to mass retirement of major league umpires: Don't let the door hit you on the way out, Wish Angel Hernandez was on this list
Close Call Sports & Umpire Ejection Fantasy League: MLB Call-Up Umpire Hiring Outlook - 2019 Break
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Sources - 10 MLB umps retiring, most since '99 - ESPN
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