Major League Baseball

5 things fans need to know about ABS Challenge System

From the time in the 1800s when the relationship between pitcher and batter became adversarial, arguments about balls and strikes have been baked into baseball. So the Automated Ball-Strike (ABS) Challenge System powered by T-Mobile being implemented in MLB this year was a very long time coming.
Los Angeles Magazine

MLB’s ABS System Makes Debut

The 2026 MLB season debuts ABS, allowing pitchers, catchers and batters to challenge umpire ball-strike calls.

How are players measured for MLB's ABS system?

Measuring players for ABS is a very precise system. Here's how it works.

Baseball Hall of Fame pitcher goes in depth how ABS system will improve offense, how arms have to adjust

CC Sabathia praises the MLB pitch clock for bringing fans back to ballparks and says the new ABS ball-strike challenge system will help get every call right.