Hernández, Jonathan
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 | 3.86 |
| ERA current pace | 0.00 |
| ERA rolling p50 | 3.39 |
| Observed weight | 12% |
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 | 46.9% | 38 | 109 | limited sample |
| SL | 44.4% | 36 | 102 | limited sample |
| FB | 6.2% | 5 | 113 | limited sample |
| CH | 2.5% | 2 | 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 | 32.4 | -- | -- |
| Batters Faced | 146 | -- | -- |
| K% | 22.9% | 15.0% to 28.4% | +/- 6.7% |
| BB% | 10.3% | 6.1% to 14.5% | +/- 4.2% |
| Whiff% | 26.8% | 21.9% to 34.9% | +/- 6.5% |
| HR/9 | 1.44 | 0.48 to 2.23 | +/- 0.88 |
| xwOBA Against | 0.303 | 0.211 to 0.343 | +/- 0.066 |
| Barrel% Allowed | 8.4% | 2.8% to 11.8% | +/- 4.5% |
| ERA | 3.57 | 1.67 to 6.64 | +/- 2.48 |
| FIP | 4.25 | 2.73 to 6.44 | +/- 1.86 |
| WHIP | 1.298 | 0.993 to 1.677 | +/- 0.342 |
302 career BF
| xwOBA | 0.260 |
| K% | 17.5% |
| BB% | 11.8% |
| Barrel | 8.2% |
421 career BF
| xwOBA | 0.243 |
| K% | 19.0% |
| BB% | 8.7% |
| Barrel | 7.1% |