CurveballArsenal Shape: Gloveside Drop
Δ HB -5.3in · Δ VB +0.6in
Current: HB 2.3in / VB -8.6in
Recommended: HB -3.0in / VB -8.0in
Optimization diagnostic / TB
Griffin Jax
Griffin Jax's production (69) outpaces the tools grade (58) by 11 points. Primary finding: changeup grades as the best pitch (whiff 57.1%, csw 36.4%) but is only thrown 19.8% of the time. Also flagged: Arsenal Shape: Gloveside Drop; Usage Overuse: Sinker. Most actionable fix: increase changeup usage to at least league-average for that pitch type.
Data window 2026-09-12 / 2026-09-26Confidence MEDIUM
Optimization map
Arsenal shape map
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Movement reshape
Pitch movement dual-view
Current shape against the recommended movement window. Animation starts when this section scrolls into view.
Diagnosis
Fixable gaps
| Signal | Cause | Fix | Confidence |
|---|---|---|---|
| Arsenal Shape: Gloveside Drop0.60 | Existing Curveball is present, but its movement shape does not currently cover the desired gloveside-drop window. | Reshape existing Curveball to add gloveside drop rather than developing a new pitch from scratch.Shape refinement would improve platoon coverage while preserving the existing usage signal. | HIGH |
| Usage Underuse: Changeup0.70 | Changeup grades as the best pitch (whiff 57.1%, CSW 36.4%) but is only thrown 19.8% of the time | Increase Changeup usage to at least league-average for that pitch typeUsage rebalancing is the simplest optimization with immediate impact | MEDIUM |
| Usage Overuse: Sinker0.60 | Sinker grades as the weakest pitch (whiff 4.3%, CSW 24.6%) but is thrown 30.1% of the time | Reduce Sinker usage in favor of higher-performing offeringsUsage rebalancing is the simplest optimization with immediate impact | MEDIUM |
Arsenal / metrics
Underlying components
| Component | Usage | Velo | Whiff |
|---|---|---|---|
| SinkerSI | 30% | 94.9 | 4.3% |
| Four-Seam FastballFF | 23% | 95.5 | 28.0% |
| SweeperST | 22% | 86.7 | 29.1% |
| ChangeupCH | 20% | 90.1 | 57.1% |
| CurveballCU | 7% | 84.6 | 18.8% |