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Associated Press
FILE - In this Feb. 18, 2009, file photo, Arizona Diamondbacks' Eric Byrnes gets ready to bat during spring training baseball in Tucson, Ariz. On Tuesday, July 28, 2015, a computer will stand in to call balls and strikes in what is considered to be the first professional game without an umpire calling the pitches. (AP Photo/Elaine Thompson, File)

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