Fans put MLB umpires in the crosshairs after questionable call leads to ejection: If you keep messing up this bad, robots will absolutely take over
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MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today
Here's the pitch: Umps struggle with balls, strikes, Ron Kantowski, Sports
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MLB Umpires Missed 34,294 Ball-Strike Calls in 2018. Bring on Robo-umps?, Bostonia