Home Plate Umpire Brian Walsh uses an earpiece to hear the electronic notification as to weather a pitch was a ball or a strike by the ABS system during a AAA minor league baseball game.

Apr 30, 2023; Mexico City, Mexico; Home plate umpire Pat Hoberg (31) calls an out in the fifth inning during a MLB World Tour game between the San Diego Padres and the San Francisco Giants at ...

While MLB's ABS challenge system (automated balls and strikes) is still in the testing phase this spring training, we're already seeing how umpires respond to the system on the field. And credit ...