Baseball Makes History: First Robot Umpire Challenge Fails in Giants-Yankees Game

New York Yankees player José Caballero made baseball history by becoming the first player to challenge an umpire's call using MLB's new automated strike zone system. The robot umpire upheld the original strike call during Wednesday's season opener against San Francisco.

SAN FRANCISCO (AP) — Baseball history was made Wednesday night when New York Yankees infielder José Caballero became the first player to challenge an umpire’s call using Major League Baseball’s new Automated Ball-Strike System, though his appeal was unsuccessful during the season opener against the San Francisco Giants.

The historic moment occurred in the fourth inning when Giants pitcher Logan Webb delivered a 90.7 mph sinker to the upper inside corner of the plate. Home plate umpire Bill Miller, who has officiated MLB games since 1997, called it a strike. Caballero responded by tapping his helmet to signal a challenge, prompting the system’s 12 Hawk-Eye cameras to review the pitch. The automated technology confirmed Miller’s original call, with the decision displayed on Oracle Park’s scoreboard.

At that point in the game, New York held a commanding 5-0 lead. Earlier, Caballero had contributed to his team’s offense with an RBI double during a five-run rally in the second inning against Webb, who reached a career milestone by recording his 1,000th strikeout in the fourth frame.

The robotic strike zone technology underwent extensive testing in minor league baseball beginning in 2019 and was implemented during major league spring training in both 2025 and 2026. Despite the automation, some managers have indicated they will continue finding opportunities to dispute calls and risk ejection.

Prior to Wednesday’s contest, Yankees skipper Aaron Boone expressed enthusiasm for the new technology and emphasized the significance of preparing his players for challenge situations.

“I hope so,” Boone responded when questioned about his excitement for the system. “We’ve had a lot of dialogue at it, it’s something that we’ve poured a lot into, I’ve certainly. It’s become one of the things I’ve kind of tried to lead the charge on a little bit. Another kind of end-of-spring meeting with all the position players and catchers at the end just kind of running through different ones that came up and give my feedback on it. I’ve been very direct with them during spring as far as after the fact if I thought one was really good or conversely if one was terrible.”

Boone acknowledged that adapting to the system would require patience and experience from everyone involved.

“I’ve tried to be real direct with them and why,” he explained. “I feel like we’re going to be good at it, that’s the expectation. I’m sure we’ll continue to evolve with it.”

Giants manager Tony Vitello, who transitioned to San Francisco from the University of Tennessee without any professional playing or coaching background, admitted he needed to remind himself earlier Wednesday about the automated system’s role.

“I’ve got to be honest with you, one thing I was looking at is who are the umpires tonight?” he said. “You get on google the first thing you see is there’s going to be a robot umpire. And it was only for a millisecond but I kind of freaked out.”