A robot umpire, powered by automated tech and employed for the first time at an MLB All-Star Game, helped reverse four ball/strike calls, the CBC reports. Only one appeal, by Marlins outfielder Kyle Stowers, did not result in a changed call after input from the Automated Ball-Strike System.

MLB has been experimenting with the automated ball-strike system in the minor leagues since 2019 and will use it in an All-Star Game for the first time this summer. Each team gets two challenges and retains the challenge if it is successful.

A human umpire, along with batters and pitchers, have a couple of seconds to review the footage and challenge a call if they think the automated system was wrong. It's a system the MLB has experimented with since 2019 and is finally ready to bring to the national stage.