MLB plans to use robot umpire challenge system in Atlanta All-Star Game

The Automated Ball-Strike System plays on the scoreboard after a pitch call was challenged during the first inning of a spring training baseball game between the Chicago White Sox and the San Diego Padres, Feb. 26, 2025, in Phoenix. (AP Photo/Carolyn Kaster, File)

Major League Baseball plans to use its robot umpire technology for ball-strike challenges in Tuesday’s All-Star Game at Atlanta, another step toward possible regular-season use next season.

MLB said Wednesday it intends to make the All-Star announcement Thursday.

Teams won 52.2% of their ball/strike challenges during the spring training test, with 617 of 1,182 challenges successful in the 288 exhibition games using the Automated Ball-Strike System. ABS was installed at 13 spring training ballparks hosting 19 teams, and an animation of the pitch was shown on video boards displaying the challenge result for spectators to see.