Mithrandir Metrics
Player Athletics Refreshed Jun 1 06:00 AM ET
Player profile / Athletics

Jack Perkins

P profile with live context, projection links, and Mithrandir card history when available.

Cards
3
Modules
1
Live Δ
yes
Club Athletics Position P Roster Active Status Healthy / active roster
Rolling projection

Preseason / current pace / Bayesian update

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

2026-06-01
ERA preseason4.30
ERA current pace5.04
ERA rolling p504.58
Observed weight37%
ERA
3.49 4.00 4.58 5.15 5.67
FIP
2.82 3.17 3.56 3.95 4.30
K%
19.8% 21.7% 23.8% 25.8% 27.7%
BB%
6.1% 7.1% 8.2% 9.3% 10.3%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%6.4%
82 +42 vs proj
Barrel allowed4.5%
86 +50 vs proj
Fastball velo96.2
78
Hard-hit allowed34.8%
76
K%25.5%
72 +26 vs proj
Whiff%28.0%
83
xwOBA allowed0.282
78 +39 vs proj
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; missing coverage is shown explicitly.

2026-06-01
Mithrandir Stuff+107
87
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 Perkins, Jack · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.2952026-05-19: 0.2952026-05-21: 0.3032026-05-23: 0.3012026-05-24: 0.3012026-05-25: 0.3012026-05-26: 0.2812026-05-28: 0.2812026-05-29: 0.2882026-05-30: 0.2882026-05-31: 0.2882026-06-01: 0.282 2026-05-17 2026-06-01 xwOBA allowed MITHRANDIR · CHARTS
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.

5Pitches 2026Season 42%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
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 Perkins, Jack · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 47%47%Whiff: 28%28%Called strike: 15%15%First pitch strike: 51%51%Hard hit allowed: 35%35% 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 Perkins, Jack · 2026 arsenal snapshot 4-Seam Fastball: 42.3%Sweeper: 30.4%Changeup: 17.1%Cutter: 8.0%Sinker: 2.2% MIX FF 42%ST 30%CH 17%FC 8%SI 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Perkins, Jack · 2026 arsenal snapshot FF: HB -0.1, IVB 1.3FFST: HB -0.0, IVB 3.0STCH: HB -0.8, IVB 2.8CHFC: HB -0.0, IVB 2.0FCSI: HB 1.3, IVB 1.8SI horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 40.7% 181 103 limited sample
SL 31.5% 140 108 limited sample
CH 18.0% 80 110 limited sample
FC 7.9% 35 111 limited sample
SI 2.0% 9 103 limited sample
Method note

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

Reference layer

Current snapshot

Age26
Height6' 1"
Weight220 lb
Debut2025-06-22
Live layer

Delta / regression

ERA Δ+0.39
K% Δ+0.039

positive regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching32026-03-09Sweeper played up through ST/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202621.6% K | 4.65 ERAProjection
2026-04-13 vs TEX4 ER / 4 K1.2 IP