Catcher interference explained

How umpires check it

1. Decide whether the catcher or another fielder hindered the batter's legal chance to hit the pitch.
2. Judge whether the contact happened during the pitch and the batter's attempt to hit, not after the swing on a separate follow-through or throw.
3. If interference is called and the ball is put in play, allow the action to finish before enforcing the penalty.
4. Check whether the batter reached first and every runner advanced at least one base; if so, the play normally stands.
5. If the automatic result does not stand, give the offensive manager the immediate choice between the penalty and the play.

What counts as catcher interference

The rule protects the batter's opportunity to swing at a pitch. If the catcher moves the mitt, body, mask, or other equipment into the batter's swing path and the batter is hindered, that is defensive interference. The most familiar version is a bat clipping the catcher's glove before or as the batter tries to contact the pitch.

The call does not require the catcher to intend anything. It is usually a positioning mistake: the catcher sets up too close, reaches across the plate too early, or moves forward while trying to receive the pitch or make a quick throw.

The usual award

The standard penalty is that the batter becomes a runner and is entitled to first base, provided the batter goes to first and touches it. Runners advance if they are forced by the batter's award to first.

If a runner was attempting to steal on the pitch, that runner is also protected by the award rules and is normally awarded the base being attempted. A steal of home or squeeze play from third has a special, stricter penalty: if the catcher or another fielder steps on or in front of the plate without the ball, or touches the batter or bat, the ball is dead, the batter is awarded first, and a balk is charged to the pitcher.

Why the play often continues

Catcher interference is not always killed immediately. If the batter puts the ball in play, the umpire allows the play to continue because the offence may prefer the actual result.

For example, if the batter hits a double and all runners advance at least one base, the offence does not need the interference award. If the batter grounds out but a runner scores from third, the offensive manager may choose the run and the out instead of putting the batter on first and returning the runner to third.

When the offence can choose

After the play ends, the offensive manager may immediately tell the plate umpire to decline the interference penalty and accept the result of the play. That choice matters when the play produced something better than batter to first with only forced advances.

There is an important shortcut: if the batter reaches first safely and all other runners advance at least one base, the play proceeds without using the interference penalty. The game simply keeps the result.

What is not catcher interference

• Contact before the pitch is delivered: if the catcher contacts the batter before the pitch, the umpire can call time and restart the pitch rather than award first base.
• Follow-through contact after a swing: if the batter's bat hits the catcher after missing or after the pitch has passed, the play may be handled under batter or follow-through interference rules instead.
• A normal pitch received cleanly: the catcher is allowed to catch the pitch. The violation is hindering the batter's chance to hit it.
• A batter reaching back into the catcher: the batter is not entitled to create the contact by moving outside a normal hitting action.

How it appears in the box score

In standard scoring, a batter awarded first on catcher interference has a plate appearance but no official at-bat. The defensive player who committed the interference is charged with an error when bases are awarded because of the interference.

The batter is not credited with a hit. Runs can still score if runners are forced or if the offence accepts a live-ball result that scored a run.

Misunderstandings to avoid

• "The ball is dead right away": not always. If a play follows, the umpire lets it finish so the offence can choose the better result.
• "The batter always has to take first": the offence can decline the penalty when the play is better.
• "Only the catcher can commit it": the name is common, but the rule also covers another fielder interfering with the batter.
• "Any bat-catcher contact is catcher interference": timing matters. Contact on a follow-through or during a throw can be a different rule.

Four quick rulings

• Bat clips the catcher's mitt during the swing and the batter misses: catcher interference, batter awarded first.
• Bat clips the mitt, then the batter reaches first on an infield single and the runner from first reaches second: the play stands.
• Runner on third, one out, interference is called but the batter hits a sacrifice fly and the runner scores: the offence may choose the run and the out instead of the first-base award.
• Runner from third breaks for home on a squeeze and the catcher steps in front of the plate without the ball while touching the batter's bat: dead ball, balk, batter to first, and the runner from third scores.

Source material

• MLB Official Information
• Official Baseball Rules
• MLB Rules Glossary
• Little League Rules, Regulations, and Policies