Zerpa, Angel
Run-prevention profile built on workable command
Preseason / current pace / Bayesian update
Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.
| ERA preseason | 4.06 |
| ERA current pace | 6.39 |
| ERA rolling p50 | 4.53 |
| Observed weight | 20% |
Actual percentile with projection tick
100th = best in MLB.
Stuff+ and arsenal context
Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; Arsenal Decomposition remains descriptive support under Stuff+.
Arsenal optimization map
Pitch-shape context from this pitcher’s current arsenal snapshot. Hover a pitch to inspect usage, movement, and bat-missing context.
xwOBA allowed snapshot line
Live snapshot series; true 50/100 PA windows require PA-level logs
No Live State xwOBA snapshots are available for this player.
Aggregate zone heatmap
Aggregate zone metrics from seasonal Statcast leaderboards.
Usage mix, movement map, and Stuff+ composition
2026 pitch-level arsenal aggregates; current season takes over after 100 tracked pitches across at least 2 pitch types. Descriptive pitch-type Stuff+ composition. Not a promoted predictive metric.
| Pitch | Usage | Pitches | Stuff+ | Status |
|---|---|---|---|---|
| SI | 68.1% | 147 | 106 | limited sample |
| SL | 20.8% | 45 | 97 | limited sample |
| CH | 6.0% | 13 | 98 | limited sample |
| FB | 5.1% | 11 | 99 | limited sample |
Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.
Current-season signal
No Live State delta is available for this player yet.
Point projection and range
| Metric | Point | Range | Half-width |
|---|---|---|---|
| Innings | 66.9 | -- | -- |
| Batters Faced | 293 | -- | -- |
| K% | 23.0% | 18.3% to 29.5% | +/- 5.6% |
| BB% | 7.9% | 5.3% to 10.6% | +/- 2.6% |
| Whiff% | 18.1% | 14.7% to 23.2% | +/- 4.2% |
| HR/9 | 1.37 | 0.87 to 2.17 | +/- 0.65 |
| xwOBA Against | 0.304 | 0.271 to 0.353 | +/- 0.041 |
| Barrel% Allowed | 8.4% | 6.4% to 11.9% | +/- 2.8% |
| ERA | 4.16 | 2.53 to 6.02 | +/- 1.74 |
| FIP | 3.87 | 3.01 to 5.10 | +/- 1.05 |
| WHIP | 1.258 | 1.024 to 1.603 | +/- 0.290 |
297 career BF
| xwOBA | 0.279 |
| K% | 21.7% |
| BB% | 6.5% |
| Barrel | 6.9% |
524 career BF
| xwOBA | 0.318 |
| K% | 19.3% |
| BB% | 7.2% |
| Barrel | 9.1% |