CurveballArsenal Shape: Gloveside Drop
Δ HB -11.4in · Δ VB +6.1in
Current: HB 8.4in / VB -14.1in
Recommended: HB -3.0in / VB -8.0in
Optimization diagnostic / ATH
Mason Barnett
Mason Barnett's tools (51) outpace production (32) by 19 points. Primary finding: changeup grades as the best pitch (whiff 50.0%, csw 16.7%) but is only thrown 14.5% of the time. Also flagged: Arsenal Shape: Gloveside Drop; Usage Overuse: 4-Seam Fastball. Most actionable fix: increase changeup usage to at least league-average for that pitch type.
Data window 2026-08-17 / 2026-08-31Confidence MEDIUM
Optimization map
Arsenal shape map
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armside
gloveside
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 |
|---|---|---|---|
| Stuff-to-Whiff Gap (Command)0.49 | Elite stuff tunnels well but pitches land in hittable zones | Reduce heart-of-zone pitches; increase edge and chase attemptsBetter location could push whiff rate toward 24%+ | MEDIUM |
| 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 50.0%, CSW 16.7%) but is only thrown 14.5% 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: 4-Seam Fastball0.60 | 4-Seam Fastball grades as the weakest pitch (whiff 12.0%, CSW 17.3%) but is thrown 62.6% of the time | Reduce 4-Seam Fastball usage in favor of higher-performing offeringsUsage rebalancing is the simplest optimization with immediate impact | MEDIUM |
Arsenal / metrics
Underlying components
| Component | Usage | Velo | Whiff |
|---|---|---|---|
| 4-Seam FastballFF | 63% | 94.7 | 12.0% |
| ChangeupCH | 14% | 84.2 | 50.0% |
| SliderSL | 10% | 87.3 | 0.0% |
| SweeperST | 7% | 83.8 | 50.0% |
| CurveballCU | 6% | 78.0 | 0.0% |