Robot umpire debuts at Las Vegas Ballpark with little fanfare
Robot umpires already at Sugar Land Space Cowboys' ballpark could
Robot Umpires Strike Zone: It's Not as Simple as You ThinkBaseball
MLB Fans Threaten to Boycott Over 'Robot Umpires'—'Will Ruin the Game
MLB catchers wary of looming robo umps amid rules changes - The
Major League Baseball need automated ball and strike system, even
As automated strike zones are tested in minor leagues, Pirates
MLB umpires agree to electronic strike zone testing and
Robot umpire: Baseball edges closer to implementing automatic
Robot umpires: How it works and its effect on players and managers
MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps
Explaining ball-strike challenge system