What is the proposed ball-strike challenge system in MLB? - AS USA
MLB announces experimental rules to be tested for 2022 Minor
When It Comes to Balls in Play, MLB Is Striking Out - The Ringer
Automated ball-strike (ABS) system, pitch timer, bigger bases tested
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Triple-A's Ball/Strike Pitch Location Challenge System Update and
MLB just tweaked Triple A's electronic strike zone: What you need
Automated ball-strike (ABS) system, pitch timer, bigger bases
MLB umpires willing to let computers call balls and strikes
Automated Ball Strike System: Sugar Land Space Cowboys now able to
Robot umpires and a ball/strike challenge system are coming to
Robots in Baseball? The Possibility of an Automated Ball Strike System
Columbus Clippers to use automated strike zone in 2023 Triple-A season