March, 2021
Why do the MLB umpires sweep off home plate? - Quora
Can someone explain to me how angel hernandez is an umpire?? : r/baseball
Why can't a manager argue balls and strikes with the home plate umpire in baseball? - Quora
Robot umpire debuts at Las Vegas Ballpark with little fanfare, Ron Kantowski, Sports
Field of Schemes - BallNine
Field of Schemes - BallNine
Robot umpires and other rule changes: Coming soon to an MLB stadium near you! - Camden Chat
THE ROBOT UMPIRES DEBATE - Baseball Town
MLB umpires becoming harder to ignore, defend