Robot umpire hits grand slam during debut at MLB All-Star Game

Turns out robots are pretty good at calling balls and strikes.
 By 
Neal Broverman
 on 
The MLB All-Star game in Atlanta.
Do robot umpires wear stripes? Credit: Photo by Mady Mertens/MLB Photos via Getty Images

Should umpires be updating their LinkedIn? By the looks of Tuesday's Major League Baseball All-Star game in Atlanta, maybe so.

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.

"The ABS system powered by T-Mobile's 5G network utilizes the Hawk-Eye system to track a pitch's trajectory and location to relay an immediate verdict on whether it was a ball or a strike," the MLB notes.


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According to the league, fans have been receptive to the tech intervention, which was introduced in the Minor Leagues in 2021 and Triple AAA games the following year. ABS rules allow each team two challenges to ball/strike calls by human umpires, with the team allowed to maintain their challenges if successful. Pitchers, catchers, and batters are the only players allowed to challenge an umpire's decision, and appeals must be made immediately after the pitch.

The ABS abides by the MLB's somewhat convoluted description of what constitutes a ball as opposed to a strike, calculating the player's height and the strike zone width and depth.

Ahead of Tuesday's game, which saw the National League overtake the American League thanks to a swing-off, MLB players voiced support for their robot judges.

“I did a few rehabs starts with it. I’m OK with it. I think it works,” Dodger Clayton Kershaw told the Associated Press of the ABS.

Neal Broverman
Neal Broverman
Enterprise Editor

Neal joined Mashable’s Social Good team in 2024, editing and writing stories about digital culture and its effects on the environment and marginalized communities. He is the former editorial director of The Advocate and Out magazines, has contributed to the Los Angeles Times, Curbed, and Los Angeles magazine, and is a recipient of the Sarah Pettit Memorial Award for LGBTQ Journalist of the Year Award from the National Gay and Lesbian Journalists Association (NLGJA). He lives in Los Angeles with his family.

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