Mithrandir Metrics
Player Athletics Refreshed Jul 18 06:00 AM ET
Player profile / Athletics

Jack Perkins

P · Bats/Throws R/R · 6' 1", 220 lb · Age 26

Cards
6
Modules
1
Live Δ
yes
Club Athletics Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2025324.19124338.2371.16
2026256.87246357.2721.44
2 Seasons575.793610696.11091.33
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.

2026-07-18
40
Pitching
percentile
Pitching9 metrics
50
Arsenal6 metrics
85
Rolling projection

Preseason / current pace / Bayesian update

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

2026-07-18
ERA preseason4.30
ERA current pace6.87
ERA rolling p505.69
Observed weight54%
ERA
4.63 5.13 5.69 6.24 6.75
FIP
3.50 3.84 4.22 4.60 4.94
K%
21.7% 23.2% 24.9% 26.6% 28.1%
BB%
7.3% 8.2% 9.1% 10.1% 10.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-18
Pitching · percentile strip
WHIP1.43
30
ERA6.87
4
BB%8.9%
46
K%26.8%
78 +34 vs proj
xwOBA allowed0.318
44
Barrel allowed7.6%
53 +19 vs proj
Fastball velo96.0
74
Hard-hit allowed39.0%
50
Whiff%25.8%
72 -17 vs proj
Mithrandir+

Stuff+ and arsenal context

How nasty this pitcher's stuff grades in our pitch-level model. Missing coverage is shown explicitly.

2026-07-18
Fastball Stuff+104
59
Mithrandir Stuff+107
88
Changeup Stuff+110
93
Cutter Stuff+107
94
Sinker Stuff+106
81
Slider Stuff+109
92
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 0.318 2026-07-07: 0.3132026-07-08: 0.3132026-07-09: 0.3132026-07-10: 0.3132026-07-11: 0.3142026-07-12: 0.3142026-07-13: 0.3142026-07-14: 0.3182026-07-15: 0.3182026-07-16: 0.3182026-07-17: 0.3182026-07-18: 0.318 2026-07-07 2026-07-18 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.

6Pitches 2026Season 38%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: 37%37%Zone: 48%48%Whiff: 26%26%Called strike: 16%16%First pitch strike: 50%50%Hard hit allowed: 39%39% 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.

Watch the pitches in 3D →

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: 37.8%Sweeper: 29.9%Changeup: 17.7%Cutter: 9.2%Sinker: 2.9%Slider: 2.5% FF38% · 96 mphprimary pitch FF 38%ST 30%CH 18%FC 9%SI 3%SL 3% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Perkins, Jack · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 38% usage, 0″ horizontal break, 15″ drop, 96.1 mphFF96 mphSweeper: 30% usage, 0″ horizontal break, 35″ drop, 86.1 mphST86 mphChangeup: 18% usage, 8″ horizontal break, 33″ drop, 89.7 mphCH90 mphCutter: 9% usage, 0″ horizontal break, 24″ drop, 92.5 mphFC93 mphSinker: 3% usage, 12″ horizontal break, 22″ drop, 94.7 mphSI95 mphSlider: 3% usage, 1″ horizontal break, 39″ drop, 87.3 mphSL87 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 39.8% 207 104 qualified
SL 33.1% 172 109 limited sample
CH 16.5% 86 110 limited sample
FC 8.3% 43 107 limited sample
SI 2.3% 12 106 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+2.22
K% Δ+0.051

positive regression

Regression watch

Unlucky so far. Better days ahead.

1.8σ gap
wOBA-against (actual)0.372
xwOBA-against (deserved)0.318

Perkins’s wOBA-against sits at 0.372, but the quality of contact underneath says it should be 0.318 — a gap of 0.054, 1.8 standard deviations from the MLB norm over 61 IP. The results have been worse than the process deserves; as the sample grows, expect the numbers to climb back toward the underlying level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching62026-07-03Four-Seam Fastball played up through FF/ST 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