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MLB's 'robot umpires' have officially arrived. Here's how they work

For the first time, Major League Baseball will be using "robot umpires" or the Automated Ball-Strike System (ABS) in official league games this season, allowing players to challenge balls and strikes. CNN's Hannah Keyser explains how the new challenge system works.

1:47 • Source: CNN
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MLB's 'robot umpires' have officially arrived. Here's how they work
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