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EXCERPT:
When it comes to making fair calls, the Korea Baseball Organization (KBO) deploys robots. The nation’s professional league added a fleet of so-called robot umpires to the field during its 2024 season, hoping to even out the playing field. Called the Automatic Ball-Strike system (ABS), it utilizes pitch-tracking sensors and camera arrays to quickly analyze when a pitch crosses the strike zone—not uncanny machines wearing catcher’s gear. The ABS data is then presented to the human home plate umpire, who announces their call based on the additional analysis.
ABS is designed to offer more accurate decisions while reducing overall bias in games, but did it deliver? Two years later, researchers at the University of Michigan (UM) say effects are already clear—although not necessarily what some baseball fans (or players) anticipated.
According to a study published in the journal European Sport Management Quarterly, famous top-ranking hitters performed worse during the 2024 KBO season compared to previous year for statistics involving strike-zone judgment. Meanwhile, the high status players walked less, struck out more, and reached bases less often when ABS entered the equation.
“This suggests that there may have been an existing bias in favor of prominent batters before ABS,” Jimin Song, a UM kinesiologist and study co-author, said in a statement. “Before ABS, when a big-name batter was at bat, umpires may have given more favorable calls on borderline pitches.”
