Pitch Spin
Pitch spin refers to rotation imparted on the ball at release. Intentional spin to alter the ball's flight path is an illegal pitch in slow-pitch; minimal, incidental backspin is generally permitted.
Because slow-pitch pitchers cannot rely on speed or movement, some try to add spin to produce a wobble or curve off the arc. Associations prohibit intentional wrist-snapping or finger-spin that causes visible curve. Incidental backspin from a clean release is legal. Hitters benefit from reading spin early because a wobbling ball is harder to time, while a clean rotation signals a true arc descent.
Example
The umpire calls illegal pitch after noticing the pitcher snap the wrist sideways, imparting visible sidespin that curves the ball off the straight arc.
Related terms
- Illegal PitchAn illegal pitch is any delivery that violates the rules — most commonly a pitch outside the legal arc window, a spin-thrown ball, or a release from an illegal position.
- Legal DeliveryA legal delivery in slow-pitch softball is a pitch that is released underhand with a smooth, continuous motion and arrives within the required arc height — typically between 6 and 12 feet — over the plate.
- Pitch TrackingPitch tracking is following the high-arcing slow-pitch ball all the way from its peak down to the contact point. Because the ball descends steeply, the eyes lead the swing.
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