Robot umpires at home plate moving up to Triple-A for 2022, one step away from major league baseball - ESPN
Will baseball ever replace umpires with robots?
Can computers call a better game than human umpires? Major League Baseball wants to find out
MLB's PitchCom System Draws Mixed Reactions - The New York Times
MLB's automated strike zone debuts in Triple A Pacific Coast League - The Athletic
COOPER: Challenge System Has Best Aspects of ABS Without the Downsides — College Baseball, MLB Draft, Prospects - Baseball America
Do Umpires Dream of Electronic Strikes?, News, Scores, Highlights, Stats, and Rumors
Automated ball-strike system challenge system a hit in AFL
Baseball Team Has Computer Call Balls, Strikes
A computer will soon call ball or strike at Principal Park
Robo umps reach Triple-A, but MLB rollout still uncertain
Why doesn't the MLB use technology to call balls and strikes when it's much more accurate than umpires? - Quora
Major League Baseball considers dramatic change with robot umpires - CBS News