ABS Dashboard

MLB introduced the Automated Ball-Strike (ABS) Challenge System powered by T-Mobile beginning with the 2026 season. The system will rely on the same Hawk-Eye tracking technology that fuels MLB's Statcast data.

What to know about the challenge system:

  • Only batters and pitchers/catchers may initiate a challenge. Managers, coaches and other players may not be involved.
  • Each team starts the game with two challenges. Teams will lose the ability to challenge after they do so incorrectly twice. Teams will start each extra inning with a challenge regardless of whether they have already exhausted their challenges in the first nine innings.
  • The ABS zone is set as follows: The width is 17 inches, identical to home plate. The top of the zone is set at 53.5% of a player's measured height without cleats. The bottom is set at 27% of the player's measured height. The strike zone is captured as the ball passes through the middle of the plate, not the front.
  • In MLB, challenges will not be permitted when a position player is pitching.
  • This page shows an at-a-glance ABS dashboard. For in-depth Statcast ABS metrics, go here.

Season Data

Overall
50%
Overturns
4,628 overturns
9,342 attempts
Batters
45%
Overturns
2,030 overturns
4,510 attempts
Fielders
54%
Overturns
2,598 overturns
4,832 attempts

Top Performers (2025)

This section shows a brief top-level summary of team and player performance in challenging calls. “Challenge Rate” is expressed as the rate of challenges initiated out of potential challenges, defined as non-swings (takes) that a) came with at least one challenge available and b) resulted in calls that went against the challenging team (i.e. called strike for hitters and called ball for fielders).

For a more detailed leaderboard and in-depth metrics, go here.

Teams Players

Most Successful Overturns (Batting Teams)

>> View detailed leaderboard

Most Successful Overturns (Fielding Teams)

>> View detailed leaderboard

We track both overturns "for" and overturns "against."

  • An "overturn for" a player is an overturned call due to his challenge.
  • An "overturn against" a player is an overturned call occurring due to an opponent's challenge while facing that player. For example, a catcher overturning a ball into a strike while Juan Soto is at the plate would represent an overturn "against" Soto.

This chart allows you to view challenge frequency and success rate broken down situationally.

  • “Overturn Rate” is simply how often a challenge results in a successfully changed call.
  • “Challenge Rate” is expressed as the rate of challenges initiated out of potential challenges, defined as non-swings (takes) that a) came with at least one challenge available and b) resulted in calls that went against the challenging team (i.e. called strike for hitters and called ball for fielders).