Tunnel Point
Also known as: pitch tunneling point, decision point
The tunnel point is the point in a pitch's flight — roughly where the batter must decide to swing — where two different pitch types are still on nearly identical trajectories before diverging.
A hitter has a fixed, very short window to decide whether to swing, roughly the point at which the ball has traveled about half the distance from the mound to the plate. Two pitches that share the same release point, arm speed, and initial trajectory through that decision window are said to be "tunneled" — the hitter cannot yet tell them apart. What happens after the tunnel point is what separates the pitches: the fastball continues straight while the slider breaks glove-side, or the changeup simply arrives later than the identical-looking fastball did.
The tighter two pitches tunnel — the longer they travel on the same apparent path before diverging — the more swing-and-miss or weak contact they generate, because the hitter's decision is made on incomplete information. Tunneling is a function of release-point consistency above all else; a pitcher whose fastball and slider come from visibly different arm slots or release heights gives the hitter an early tell, collapsing the tunnel before it can do its job.
Example
Video overlay showed his slider and fastball traveling on an identical path for the first 25 feet before diverging, a tight tunnel that made the slider nearly impossible to distinguish out of the hand.
Why it matters
Tunneling is one of the clearest video-verifiable deception metrics — SwingVantage can overlay release point and early flight path across pitch types from the same session to show how tightly an arsenal actually tunnels.
How it shows up on video
On video, a well-tunneled pair of pitches shares the same release point, arm speed, and early trajectory; a poorly tunneled pair shows visibly different release heights or an arm-speed change that telegraphs which pitch is coming before the tunnel point is even reached.
Common mistakes
- Throwing pitches from subtly different release points without realizing it, which gives hitters an early read before the tunnel point
- Changing arm speed between fastball and off-speed pitches, destroying the tunnel regardless of how similar the pitches look on paper
- Focusing only on individual pitch shape and ignoring how two pitches look together out of the hand, which is what tunneling actually measures
In SwingVantage Motion Lab
SwingVantage Motion Lab compares release-point coordinates and early trajectory across different pitch types from the same outing, flagging when a breaking ball or changeup diverges from the fastball's path earlier than intended.
Frequently asked questions
Is tunnel point the same thing as tunneling?
They are closely related — tunneling describes the overall effect of pitches sharing a flight path, while the tunnel point is the specific location on that path where the hitter must commit to a decision.
Related terms
- Pitch TunnelingPitch tunneling is the strategy of throwing different pitch types that share the same flight path early before diverging late — making it nearly impossible for the hitter to distinguish them in time.
- Pitching DeceptionPitching deception refers to any element of a pitcher's mechanics, grip, or delivery that delays or confuses the hitter's ability to identify the pitch type, speed, or location.
- Release PointRelease point is the precise spatial location in front of the body where the pitcher lets go of the ball — consistency here is the foundation of command.
- Backdoor Breaking BallA backdoor breaking ball starts outside the strike zone, away from an opposite-handed batter, and breaks back over the outside corner for a called strike, appearing to be a ball until the last instant.
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