Petersen, Michael
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 | 3.60 |
| ERA current pace | 3.98 |
| ERA rolling p50 | 3.71 |
| Observed weight | 29% |
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 | 55.3% | 192 | 108 | limited sample |
| SL | 27.4% | 95 | 105 | limited sample |
| CH | 17.3% | 60 | 104 | limited sample |
Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.
Current-season signal
| ERA Δ | +0.10 |
| K% Δ | +0.021 |
| Sample | 22.7 IP |
Point projection and range
| Metric | Point | Range | Half-width |
|---|---|---|---|
| Innings | 32.2 | -- | -- |
| Batters Faced | 142 | -- | -- |
| K% | 22.4% | 13.9% to 29.4% | +/- 7.8% |
| BB% | 9.5% | 5.6% to 13.4% | +/- 3.9% |
| Whiff% | 22.5% | 14.6% to 28.5% | +/- 6.9% |
| HR/9 | 1.26 | 0.55 to 2.09 | +/- 0.77 |
| xwOBA Against | 0.327 | 0.254 to 0.398 | +/- 0.072 |
| Barrel% Allowed | 8.0% | 3.5% to 11.9% | +/- 4.2% |
| ERA | 3.88 | 2.34 to 6.87 | +/- 2.26 |
| FIP | 4.20 | 2.90 to 5.49 | +/- 1.30 |
| WHIP | 1.339 | 1.016 to 1.677 | +/- 0.331 |
78 career BF
| xwOBA | 0.306 |
| K% | 15.4% |
| BB% | 9.3% |
| Barrel | 8.6% |
95 career BF
| xwOBA | 0.281 |
| K% | 16.3% |
| BB% | 6.7% |
| Barrel | 6.3% |