Fermin, José
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 | 3.64 |
| ERA current pace | 2.84 |
| ERA rolling p50 | 3.47 |
| Observed weight | 21% |
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 |
|---|---|---|---|---|
| SL | 59.5% | 122 | 102 | limited sample |
| SI | 23.9% | 49 | 104 | limited sample |
| CH | 8.8% | 18 | 96 | limited sample |
| FB | 7.8% | 16 | 90 | 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 | 35.0 | -- | -- |
| Batters Faced | 157 | -- | -- |
| K% | 25.0% | 18.7% to 34.0% | +/- 7.6% |
| BB% | 11.6% | 6.1% to 17.2% | +/- 5.6% |
| Whiff% | 26.9% | 22.0% to 35.8% | +/- 6.9% |
| HR/9 | 1.24 | 0.53 to 2.44 | +/- 0.95 |
| xwOBA Against | 0.309 | 0.226 to 0.368 | +/- 0.071 |
| Barrel% Allowed | 9.5% | 4.2% to 16.2% | +/- 6.0% |
| ERA | 3.92 | 1.97 to 6.59 | +/- 2.31 |
| FIP | 3.87 | 2.30 to 6.36 | +/- 2.03 |
| WHIP | 1.324 | 0.996 to 1.718 | +/- 0.361 |
72 career BF
| xwOBA | 0.252 |
| K% | 22.1% |
| BB% | 13.9% |
| Barrel | 13.2% |
83 career BF
| xwOBA | 0.239 |
| K% | 23.3% |
| BB% | 10.1% |
| Barrel | 10.2% |