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Columbus Clippers, Triple-A baseball learn new challenge system
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What do robo-umps, challenge system mean for catchers? Some
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Korean baseball league introduces automated ball-strike system for
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New balls and strikes system a success at Principal Park
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MLB catchers wary of looming robo umps amid rules changes - The
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Pitch-framing Yankees catchers want no part of robo umps
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Yankees pitchers have complaints about automated strike zone
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Column: Improving ball-strike calls is a challenge MLB needs to
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Fixing MLB's Strike Zone - a Challenge System Proposal
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Robot Umpires Strike Zone: It's Not as Simple as You ThinkBaseball
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Instant replay in Major League Baseball - Wikipedia
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We are getting closer to an automated ball-strike system in MLB
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The Automated Strike Zone Is Slightly Different At Triple-A in
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When It Comes to Balls in Play, MLB Is Striking Out - The Ringer