MLB Rumors: Huge Update On ABS System Coming To MLB

Tampa Bay Rays outfielder Taylor Walls argues with umpire Vic Carapazza during 2025 game.

Commissioner Rob Manfred confirmed MLB's intent to implement an automated ball-strike (ABS) challenge system beginning in the 2026 regular season, pending a Competition Committee vote.

While technically a proposal, the league holds a majority on the 11-person committee and can pass rule changes without player approval, as it did with the pitch clock and shift restrictions in 2023.

Human Umpires Stay, But With Tech Support

Rather than fully replacing umpires, the ABS challenge system blends tech with tradition. Umpires will continue to call balls and strikes, but each team gets two challenges per game. If a challenge is successful, it’s retained; if not, it’s lost. Batters, catchers, or pitchers must challenge in real time, typically with a simple signal like tapping a helmet. Spring Training tests showed each challenge adds just 17 seconds on average.

Rob Manfred will propose the ABS system and it's likely to arrive to MLB in 2026

(via @EvanDrellich) pic.twitter.com/UnQylCW7Yu
— Jomboy Media (@JomboyMedia) June 5, 2025

This format preserves the role of pitch framing for catchers while increasing strike zone accuracy. The system uses personalized strike zones based on player height, not a one-size-fits-all model seen on TV broadcasts.

What’s Next: Check Swings and Olympic Involvement

Manfred was less certain about expanding ABS to check swing challenges, which are still being tested in lower minor leagues. That system may require more logistical planning. He also hinted at Olympic participation for MLB players in 2028 and reported rising MLB attendance and viewership in 2025, attributing the surge to star power and more interleague matchups.