Klein, Will
Late-inning arm with usable miss-bat shape
Season percentile report
The headline weighs outcome stats (xwOBA, barrels); each bar averages its full strip group below. 100 = best in MLB.
percentile
Preseason / current pace / Bayesian update
Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.
| ERA preseason | 3.78 |
| ERA current pace | 2.41 |
| ERA rolling p50 | 3.20 |
| Observed weight | 43% |
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
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 |
|---|---|---|---|---|
| FB | 51.0% | 224 | 103 | qualified |
| SL | 31.0% | 136 | 111 | limited sample |
| CB | 18.0% | 79 | 100 | limited sample |
Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.
Current-season signal
| ERA Δ | -1.37 |
| K% Δ | +0.006 |
| Sample | 40.3 IP |
positive regression
Point projection and range
| Metric | Point | Range | Half-width |
|---|---|---|---|
| Innings | 31.2 | -- | -- |
| Batters Faced | 144 | -- | -- |
| K% | 25.2% | 18.0% to 31.3% | +/- 6.7% |
| BB% | 10.9% | 6.7% to 15.5% | +/- 4.4% |
| Whiff% | 23.1% | 16.7% to 29.2% | +/- 6.3% |
| HR/9 | 0.86 | 0.00 to 1.54 | +/- 0.77 |
| xwOBA Against | 0.297 | 0.251 to 0.379 | +/- 0.064 |
| Barrel% Allowed | 6.4% | 2.6% to 10.3% | +/- 3.8% |
| ERA | 3.78 | 1.53 to 6.48 | +/- 2.48 |
| FIP | 3.51 | 1.33 to 4.99 | +/- 1.83 |
| WHIP | 1.349 | 1.048 to 1.775 | +/- 0.363 |
68 career BF
| xwOBA | 0.265 |
| K% | 20.3% |
| BB% | 10.9% |
| Barrel | 4.4% |
65 career BF
| xwOBA | 0.259 |
| K% | 20.6% |
| BB% | 9.4% |
| Barrel | 4.3% |