Should MLB umpires really be wearing advertisements?
FTX Strikes Sponsorship Deal With MLB, Umpires to Wear Crypto Exchange's Logo - CoinDesk
Close Call Sports & Umpire Ejection Fantasy League: MLB Debuts Umpire Uniform Ads During All-Star Game
MLB Fans Threaten to Boycott Over 'Robot Umpires'—'Will Ruin the Game
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Some Thoughts on the 2021 MLB All-Star Game
Major League Baseball umpire loses appeal of discrimination lawsuit
Umpire (baseball) - Wikipedia
Umpire C.B. Bucknor ends Brewers game with missed strike three
In 1973, new fashion for baseball umpires was strictly a judgment call - The Boston Globe
Why become a high school baseball umpire? You've got a game - Los Angeles Times
Beyond the grunt: Umpires mic up, and baseball changes a bit
Marlborough's Jim Reynolds calls it a career after 24 years as an MLB umpire - The Boston Globe