What is Catcher's Interference? Definition and Examples
Catcher's interference occurs when the catcher's glove or body illegally contacts the batter's bat during a swing, awarding the batter first base — an increasingly common play as catchers set up closer to the plate for pitch framing.
This stat runs every night — play free
Live Statcast, refreshed every night. See the leaders, then play a half-inning with their cards — no signup, ~30 seconds.
What is Catcher's Interference?
Catcher's interference is a rule violation in which the catcher — or any fielder — physically hinders the batter's swing, most often by the catcher's glove touching the bat as it comes through the zone. When it happens, the batter is awarded first base, any forced runners advance, and the play is scored as an error on the catcher (though no at-bat is charged to the hitter). If the batter puts the ball in play anyway and reaches safely, the offense can elect the result of the play instead of the interference award.
How It's Called and Scored
The mechanic: the umpire judges that contact between glove and bat occurred before or during the swing. The ball is dead (unless the offense benefits from continuing play), the batter takes first, and runners advance only if forced. Officially it goes in the books as an error on the catcher — E2 — but the hitter is credited with reaching on interference, not a hit, and no plate appearance counts as an at-bat. The underlying cause is usually catcher positioning: to steal strikes via pitch framing, catchers set up with their glove extended far forward, close to the hitter's swing path.
Worked Example
Jacoby Ellsbury is the all-time king of drawing catcher's interference — he set the single-season record with 12 in 2016 and finished his career with 31, an MLB record. His long, flat swing path clipped the gloves of catchers who crouched tight to the plate. The trend is league-wide: catcher's interference calls have risen sharply in the Statcast era as framing-obsessed catchers creep forward. In 2023, several teams logged double-digit interference calls, and clubs now explicitly coach catchers on glove depth — trading a few stolen strikes at the front of the zone against the risk of handing out free bases.
Why It Matters
It's a small event with real analytical weight. For catchers, interference frequency is a hidden cost of aggressive framing setups that doesn't show up in traditional framing runs leaderboards — a catcher who steals two strikes a game but gifts an interference every week may be netting less than his framing numbers suggest. For hitters with long swings, it's a genuine on-base skill: Ellsbury's 31 career interferences were 31 free times on base. Replay review has also made the call more precise — slow-motion clearly shows glove-bat contact that umpires once missed.
Limitations and Common Misconceptions
Catcher's interference is not the same as obstruction (which applies to fielders impeding runners) or as a hit by pitch. Contact with the batter's body rather than the bat is usually ruled a hit-by-pitch or nothing at all, depending on circumstances. It also doesn't require intent — a catcher reaching for a low pitch who clips the swing is guilty even with perfect innocence. And the batter can't "cause" it deliberately by swinging at the glove; umpires can rule no interference if the swing was abnormal.
Related Terms
In Legends Deck: Catcher cards carry framing and defensive grades derived from real Statcast data — aggressive framers gain strike-zone value in simulation but carry a small interference risk, reproducing the real trade-off front offices evaluate.