Caballero becomes first to use MLB's new automated ball-strike system in regular season.

New York Yankees shortstop José Caballero became the first player to use MLB’s new Automated Ball-Strike system during a regular-season game on Wednesday, but his challenge of a strike call was unsuccessful. The system, which uses high-speed cameras to track pitches, upheld the original call, marking the official debut of the ABS challenge system in the majors.