Baltimore Catcher Makes MLB History with Robo-Ump Challenge

Samuel Basallo's successful challenge marks the first game-ending use of the Automated Ball-Strike System.

Apr. 1, 2026 at 10:01pm

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In a game against an unnamed opponent, Baltimore catcher Samuel Basallo made MLB history by becoming the first player to successfully challenge a call using the league's new Automated Ball-Strike System, ending the game in the process.

Why it matters

The Automated Ball-Strike System, often referred to as 'robo-umps', has been a controversial introduction to Major League Baseball, with some players and fans skeptical of the technology. Basallo's successful challenge highlights how the new system can impact the outcome of close games.

The details

With the game tied in the bottom of the 9th inning, Basallo stepped up to the plate and took a pitch that was called a strike by the robo-ump. Basallo immediately signaled for a challenge, and after a brief review, the call was overturned, giving Basallo a ball instead. The at-bat continued, and Basallo eventually drew a walk-off walk to win the game for the Orioles.

  • The game-ending challenge occurred in the bottom of the 9th inning on April 1, 2026.

The players

Samuel Basallo

The Baltimore Orioles catcher who made the successful robo-ump challenge to end the game.

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What they’re saying

“I knew that pitch was a ball, and I wasn't going to let the robo-ump take this game away from us. I'm glad the review went my way and we were able to walk it off.”

— Samuel Basallo, Baltimore Orioles Catcher

What’s next

The successful challenge by Basallo is likely to reignite the debate around the use of automated ball-strike technology in Major League Baseball, with both proponents and critics closely watching how the system is implemented and impacts the game going forward.

The takeaway

Basallo's historic challenge highlights how the new Automated Ball-Strike System can play a pivotal role in the outcome of close games, raising questions about the future of umpiring and the human element in America's pastime.