Check Swing
Also known as: checking the swing, held-up swing
A check swing is a swing the hitter stops before the bat crosses the plane of contact. It counts as a swing if the bat and wrists broke toward the ball.
Recognizing that a pitch is out of the strike zone after the swing has already begun is a routine part of plate discipline. Checking the swing is the mechanical skill of stopping the bat's momentum before it commits to the ball. Ideally, the bat stops before the barrel crosses in front of the body toward the plate. The physical skill involved is bat control. Strong forearms and wrists make it possible to stop cleanly rather than dragging the bat through anyway. So does a swing that hasn't already fully released the barrel toward contact.
When an umpire is uncertain whether a swing was checked in time, the call is often appealed to a base umpire. That ruling usually comes down to whether the wrists rolled over or the barrel passed the front of home plate. It is not simply about whether the bat physically stopped moving. A batter can stop the bat's forward travel and still be ruled to have swung. That happens if the wrists broke or rotated as though completing a swing.
Good plate discipline reduces how often a check swing is even necessary. Recognizing a ball earlier in its flight means the swing can be held before it starts, rather than checked after it's already underway. Still, even elite hitters sometimes need to check a swing. A pitch with late, sharp movement can change their read partway through.
Example
Fooled by a slider that broke late out of the zone, he checked his swing just in time, and the base umpire ruled no swing.
Why it matters
Bat control on a checked swing reflects the same plate discipline and pitch recognition behind good swing decisions. The check-swing call itself is a rules judgment rather than a mechanical metric, and Motion Lab does not judge it.
How it shows up on video
The swing visibly starts and then decelerates before the barrel crosses in front of the body, with the wrists staying relatively unrolled rather than completing a full rotation through the contact zone.
Common mistakes
- Starting the swing so late relative to recognizing the pitch is a ball that there is no time to check it before the barrel commits
- Rolling the wrists over even while stopping the bat's forward path, which can still be ruled a swing
- Relying on checking swings frequently instead of improving earlier pitch recognition to avoid starting the swing at all
Frequently asked questions
What determines whether a check swing is called a strike?
Umpires generally rule based on whether the bat's barrel crossed in front of the plate or the wrists rolled over as if completing a swing — not simply whether the bat physically stopped.
Can a batter appeal a check swing call?
The catcher or manager can ask the home plate umpire to appeal to a base umpire with a better angle if there is doubt about whether the batter swung.
Related terms
- Chase RateChase rate is the percentage of pitches thrown outside the strike zone that a hitter swings at. A core plate-discipline metric where lower is almost always better.
- Plate DisciplinePlate discipline is the ability to tell balls from strikes and swing only at pitches a hitter can do damage on. It is the core mental skill of hitting.
- Pitch RecognitionPitch recognition is identifying a pitch's type and location early — out of the pitcher's hand and from spin — so the hitter can commit to a swing or take decision before it's too late to act.
- Two-Strike ApproachA two-strike approach is how a hitter adjusts with two strikes. They shorten the swing, cover more of the strike zone, and put contact ahead of power.
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