10 Major League Baseball umpires retire in historic exodus
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Home plate umpires are getting better. Will that hold off the robots?
Jason Marquis - Wikipedia
Ten MLB umpires are 'set to retire at the end of the month' - the LARGEST turnover since 1999
Ten MLB Umpires Retiring, Most Since 1999
Ten MLB Umpires Set To Retire Ahead Of The 2023 Season
Four longtime MLB umpires set to retire
Gibson makes final call: MLB umpire retires after 24-year career, Sports
Miller and Márquez joined by 5 first-time World Series umpires for Fall Classic, Baseball
Baseball Umpires in 1921 – Society for American Baseball Research
