With a tap of their head, players will be able to trigger an automated review when they disagree with an umpire's call. In spring training this year, just over half of challenges were successful.
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Becky Sullivan has reported and produced for NPR since 2011 with a focus on hard news and breaking stories. She has been on the ground to cover natural disasters, disease outbreaks, elections and protests, delivering stories to both broadcast and digital platforms.