Buttó, 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 | 3.43 |
| ERA current pace | 22.50 |
| ERA rolling p50 | 4.62 |
| Observed weight | 6% |
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
2025 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 | 39.7% | 25 | 90 | limited sample |
| FB | 25.4% | 16 | 68 | limited sample |
| SL | 20.6% | 13 | 96 | limited sample |
| CH | 12.7% | 8 | 82 | limited sample |
| CB | 1.6% | 1 | 89 | 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 | 41.3 | -- | -- |
| Batters Faced | 178 | -- | -- |
| K% | 23.0% | 18.8% to 32.6% | +/- 6.9% |
| BB% | 10.8% | 6.8% to 15.1% | +/- 4.2% |
| Whiff% | 27.7% | 23.6% to 34.9% | +/- 5.7% |
| HR/9 | 1.08 | 0.28 to 1.62 | +/- 0.67 |
| xwOBA Against | 0.309 | 0.244 to 0.367 | +/- 0.062 |
| Barrel% Allowed | 7.7% | 4.1% to 11.9% | +/- 3.9% |
| ERA | 3.83 | 1.90 to 5.32 | +/- 1.71 |
| FIP | 4.00 | 2.25 to 5.18 | +/- 1.47 |
| WHIP | 1.376 | 1.091 to 1.723 | +/- 0.316 |
400 career BF
| xwOBA | 0.304 |
| K% | 21.9% |
| BB% | 13.4% |
| Barrel | 7.0% |
433 career BF
| xwOBA | 0.280 |
| K% | 23.9% |
| BB% | 7.9% |
| Barrel | 7.7% |