Mithrandir Metrics
Pitcher projection 2026 Refreshed Sep 27 06:00 AM ET
Pitcher projection / DET · 2026

Jansen, Kenley

Late-inning arm with usable miss-bat shape

Primary
22.5% K%
Range
17.2% to 31.3%
Live Δ
yes
Team DET Archetype Balanced reliever 2 Age 39 Status Healthy / active roster
At a glance

Season percentile report

The headline weighs outcome stats (xwOBA, barrels); each bar averages its full strip group below. 100 = best in MLB.

2026-09-27
69
Pitching
percentile
Pitching9 metrics
59
Arsenal4 metrics
58
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-09-27
ERA preseason3.84
ERA current pace3.20
ERA rolling p503.56
Observed weight44%
ERA
2.14 2.81 3.56 4.30 4.97
FIP
3.61 3.83 4.07 4.31 4.53
K%
21.4% 23.5% 25.8% 28.1% 30.1%
BB%
8.1% 9.2% 10.5% 11.8% 12.9%
Current percentile strip

Actual percentile with projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.04
91
ERA3.20
78
BB%12.8%
13 -37 vs proj
K%28.2%
87 +34 vs proj
xwOBA allowed0.293
75 +29 vs proj
Barrel allowed9.1%
24
Fastball velo93.7
38
Hard-hit allowed37.3%
59
Whiff%24.5%
64 +15 vs proj
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; Arsenal Decomposition remains descriptive support under Stuff+.

2026-09-27
Cutter Stuff+103
70
Mithrandir Stuff+105
76
Sinker Stuff+104
62
Slider Stuff+99
25
Optimization map

Arsenal optimization map

Pitch-shape context from this pitcher’s current arsenal snapshot. Hover a pitch to inspect usage, movement, and bat-missing context.

3Pitches 2026Season 82%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

12 snapshots
Mithrandir Metrics ROLLING XWOBA LINE Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Rolling xwOBA allowed Jansen, Kenley · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.293 2026-09-13: 0.2982026-09-14: 0.2982026-09-18: 0.3002026-09-19: 0.2952026-09-20: 0.2952026-09-21: 0.2952026-09-22: 0.2952026-09-23: 0.2952026-09-24: 0.2972026-09-25: 0.2972026-09-26: 0.2932026-09-27: 0.293 2026-09-13 2026-09-27 xwOBA allowed MITHRANDIR · CHARTS
Zone profile

Aggregate zone heatmap

Aggregate zone metrics from seasonal Statcast leaderboards.

Mithrandir Metrics ZONE HEATMAP Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Pitch Zone Profile Jansen, Kenley · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 49%49%Whiff: 25%25%Called strike: 16%16%First pitch strike: 54%54%Hard hit allowed: 37%37% Dashed border = aggregate mixed-batter zone proxy MITHRANDIR · CHARTS
Pitch arsenal

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.

2026
Mithrandir Metrics PITCH ARSENAL DONUT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Jansen, Kenley · 2026 arsenal snapshot Cutter: 82.0%Slider: 10.9%Sinker: 7.1% FC82% · 92 mphprimary pitch FC 82%SL 11%SI 7% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Jansen, Kenley · 2026 arsenal snapshot 12″24″36″48″ Cutter: 82% usage, 1″ horizontal break, 15″ drop, 92.5 mphFC92 mphSlider: 11% usage, 0″ horizontal break, 41″ drop, 84.3 mphSL84 mphSinker: 7% usage, 4″ horizontal break, 12″ drop, 93.7 mphSI94 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FC 79.5% 364 103 qualified
SL 11.8% 54 99 limited sample
SI 8.7% 40 104 limited sample
Method note

Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.

Model read

Projection notes

1
templated note
Needs the arsenal to hold up against lefties (0.283 vs 0.261 xwOBA allowed split).
2
templated note
Volume stays relief-shaped even when the bat-miss traits are strong.
3
templated note
Primary mix entering the season: Cutter 81%, Sinker 9%, Slider 6%.
Live context

Current-season signal

ERA Δ-0.61
K% Δ+0.057
Sample47.0 IP

negative regression

Projection table

Point projection and range

MetricPointRangeHalf-width
Innings38.1----
Batters Faced157----
K%22.5%17.2% to 31.3%+/- 7.1%
BB%8.9%5.5% to 12.7%+/- 3.6%
Whiff%22.4%17.8% to 27.9%+/- 5.0%
HR/91.120.44 to 1.83+/- 0.70
xwOBA Against0.3160.256 to 0.373+/- 0.059
Barrel% Allowed8.8%4.8% to 13.2%+/- 4.2%
ERA3.811.98 to 5.95+/- 1.99
FIP3.922.73 to 4.01+/- 0.64
WHIP1.1990.850 to 1.532+/- 0.341
Platoon / Shape
vs LHH

1405 career BF

xwOBA0.283
K%21.7%
BB%9.4%
Barrel9.3%
vs RHH

1454 career BF

xwOBA0.261
K%23.9%
BB%6.5%
Barrel8.7%