Knuckle-Slurve ("knuckleslurve")

aka knuckleslurve

Not really its own pitch. It's a casual mashup name for something sitting between a spike curve and a slurve. No tracking system recognizes it, so whatever gets called this would just register as one of those two.

Schematic baseball cover. This pitch has no filed seam geometry yet — the grip and shape below are sourced in words, not measured here.

The grip

There is no established grip, because this is not a recognized pitch. The name is a casual mashup of the two real pitches it sits between — the knuckle-curve (spike curve) and the slurve.

Reputable analysisKnuckle-curve (KC) — MLB.com Glossary, Pitch Types

No pitch-tracking system (Statcast or otherwise) carries a 'knuckle-slurve' or 'knuckleslurve' classification. It is a colloquial blend of two real, separately classified pitches, not its own pitch type. Sourced as the honest verdict; the two component pitches are documented (knuckle-curve at MLB.com, slurve as a 2023 Statcast classification).

What it does

No tracking system measures a distinct 'knuckle-slurve' movement profile because it isn't a classified pitch; any pitch labeled this way would actually register as a knuckle-curve or a slurve.

Reputable analysisSlurve (SV) — MLB.com Glossary, Pitch Types

Verdict, not a measured claim: the knuckle-slurve sits between the knuckle-curve and the slurve and is recognized by neither MLB Statcast nor any other classifier as its own type.

What it really is

A casual hybrid name occupying the space between two real, classified pitches: the knuckle-curve (the spike curve) and the slurve. It is best understood as either of those, not as a separate pitch.

Reputable analysisSlurve (SV) — MLB.com Glossary, Pitch Types

relationship -> knuckle-curve + slurve. Neither MLB nor any tracking system classifies a 'knuckle-slurve'; this is the honest 'not a pitch' verdict.

Who throws itNone — not a classified pitch

Basic file

This pitch has a sourced one-line grip and movement and an honest explanation — not yet a filed specimen with authored grip geometry and a full craft chapter. A fuller breakdown is coming. Sourced, not corrected.