CurveballArsenal Shape: Gloveside Drop
Δ HB -11.4in · Δ VB +3.6in
Current: HB 8.4in / VB -11.6in
Recommended: HB -3.0in / VB -8.0in
Optimization diagnostic / STL
Kyle Leahy
Kyle Leahy's tools (73) outpace production (48) by 25 points. Primary finding: sweeper grades as the best pitch (whiff 60.0%, csw 35.7%) but is only thrown 16.1% of the time. Also flagged: Arsenal Shape: Gloveside Drop; Usage Overuse: 4-Seam Fastball. Most actionable fix: increase sweeper usage to at least league-average for that pitch type.
Data window 2026-05-17 / 2026-05-31Confidence MEDIUM
Optimization map
Arsenal shape map
Hover each pitch to inspect current usage, movement shape, and whiff context beside the written diagnosis.
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 |
|---|---|---|---|
| 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: Sweeper0.70 | Sweeper grades as the best pitch (whiff 60.0%, CSW 35.7%) but is only thrown 16.1% of the time | Increase Sweeper 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 21.4%, CSW 14.8%) but is thrown 31.0% 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 | 31% | 94.2 | 21.4% |
| ChangeupCH | 18% | 88.1 | 40.0% |
| SweeperST | 16% | 85.5 | 60.0% |
| CurveballCU | 14% | 83.2 | 50.0% |
| SinkerSI | 10% | 94.1 | 0.0% |
| SliderSL | 10% | 89.2 | 0.0% |