
MLB's ABS Debut: Week-One Umpire Overturn Rates Lead the Way
Five days into the 2026 MLB season, the Automated Ball-Strike system has produced notable overturn rates among umpires led by Chad Whitson (7/7). Other high-percentage umpires include C.B. Bucknor (6/8), Chris Segal (7/10), Tripp Gibson (4/6) and Carlos Torres (4/7). Catchers dominated success on challenges, with Salvador Perez (4/4), J.T. Realmuto, and Austin Wells winning all theirs; Acuña Jr. and William Contreras each failed two challenges. The Royals and Diamondbacks benefited from overturned calls, while the Astros and Cardinals struggled, signaling early adjustments as ABS unfolds.
