The Oakland A's led MLB in challenge success with the new automated ball-strike system during spring training, which starts full use on March 25, 2026.

The Oakland Athletics led MLB in success rate using the Automated Ball-Strike system during the first 10 days of spring training, overturning 69.2% of ball-strike challenges, followed by the San Francisco Giants at 66.7%. Cincinnati, Miami, and San Diego each succeeded 61.9% of the time. The Los Angeles Dodgers had the lowest success rate at 21.4%, and Baltimore averaged the fewest challenges at 1.2 per game. Overall, MLB teams succeeded in 51.3% of challenges, averaging 2.3 per game. The system, tested in spring training last year and minor leagues since 2019, is set for full regular-season use starting March 25, 2026.