Hart, Kyle
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 | 4.72 |
| ERA current pace | 5.40 |
| ERA rolling p50 | 4.89 |
| Observed weight | 25% |
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 | 62.4% | 126 | 109 | limited sample |
| SI | 29.7% | 60 | 89 | limited sample |
| FB | 7.9% | 16 | 102 | 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 | 65.8 | -- | -- |
| Batters Faced | 282 | -- | -- |
| K% | 21.2% | 18.2% to 27.7% | +/- 4.8% |
| BB% | 7.3% | 4.9% to 10.5% | +/- 2.8% |
| Whiff% | 21.3% | 17.5% to 25.2% | +/- 3.9% |
| HR/9 | 1.35 | 1.07 to 2.52 | +/- 0.72 |
| xwOBA Against | 0.322 | 0.261 to 0.347 | +/- 0.043 |
| Barrel% Allowed | 8.3% | 5.0% to 10.5% | +/- 2.8% |
| ERA | 4.53 | 3.22 to 6.90 | +/- 1.84 |
| FIP | 4.25 | 3.40 to 5.58 | +/- 1.09 |
| WHIP | 1.257 | 0.978 to 1.591 | +/- 0.306 |
91 career BF
| xwOBA | 0.217 |
| K% | 20.9% |
| BB% | 5.4% |
| Barrel | 4.8% |
197 career BF
| xwOBA | 0.252 |
| K% | 18.5% |
| BB% | 6.0% |
| Barrel | 6.9% |