Major League Baseball’s first season with the ABS challenge system produced 10,557 challenges of ball and strike calls, and players won 5,686 of them, a 54 percent overturn rate, Bleacher Report tallied after the regular season. Home plate umpires still called every pitch. The robots served as a court of appeal, and catchers proved the sharpest at using it. Camera tracking has taken on similar jobs in football, tennis and soccer.
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