CurveballArsenal Shape: Gloveside Drop
Δ HB -3.9in · Δ VB -7.3in
Current: HB 0.9in / VB -0.7in
Recommended: HB -3.0in / VB -8.0in
Optimization diagnostic / TB
Freddy Peralta
Freddy Peralta's production (68) outpaces the tools grade (56) by 12 points. Primary finding: existing changeup is present, but its movement shape does not currently cover the desired arsenal-shape:-armside-drop window. Also flagged: Arsenal Shape: Gloveside Drop; Usage Underuse: Curveball. Most actionable fix: reshape existing changeup to add arsenal shape: armside drop rather than developing a new pitch from scratch.
Data window 2026-10-01 / 2026-10-15Confidence HIGH
Optimization map
Arsenal shape map
Hover each pitch to inspect current usage, movement shape, and whiff context beside the written diagnosis.
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ride
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)0.13 | 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: Arsenal Shape: Armside Drop0.85 | Existing Changeup is present, but its movement shape does not currently cover the desired arsenal-shape:-armside-drop window. | Reshape existing Changeup to add arsenal shape: armside drop rather than developing a new pitch from scratch.Shape refinement would improve platoon coverage while preserving the existing usage signal. | HIGH |
| 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: Curveball0.70 | Curveball grades as the best pitch (whiff 45.8%, CSW 51.2%) but is only thrown 9.1% of the time | Increase Curveball usage to at least league-average for that pitch typeUsage rebalancing is the simplest optimization with immediate impact | MEDIUM |
Arsenal / metrics
Underlying components
| Component | Usage | Velo | Whiff |
|---|---|---|---|
| Four-Seam FastballFF | 70% | 96.8 | 17.6% |
| ChangeupCH | 24% | 88.6 | 27.3% |
| CurveballCU | 9% | 82.2 | 45.8% |