Mithrandir Metrics
Player St. Louis Cardinals Refreshed Oct 16 06:00 AM ET
Player profile / St. Louis Cardinals

Cooper Hjerpe

P · Bats/Throws L/L · 6' 3", 200 lb · Age 25

Cards
0
Modules
0
Live Δ
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Club St. Louis Cardinals Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2026104.3840012.1151.30
1 Seasons104.3840012.1151.30
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.

2026-10-16
14
Pitching
percentile
Arsenal5 metrics
14
Rolling projection

Preseason / current pace / Bayesian update

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

Pending

Rolling player projection appears after current-season Statcast and projection joins refresh.

Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-10-16
Mithrandir+

Stuff+ and arsenal context

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

2026-10-16
Changeup Stuff+74
0
Cutter Stuff+101
43
Fastball Stuff+95
12
Mithrandir Stuff+92
9
Slider Stuff+94
9
Rolling form chart

xwOBA allowed snapshot line

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

0 snapshots
No chart yet

No Live State xwOBA snapshots are available for this player.

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.

4Pitches 2026Season 52%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 Hjerpe, Cooper · Aggregate zone metrics; not pitch-by-pitch locations Edge: 35%35%Zone: 47%47%Whiff: 24%24%Called strike: 18%18%First pitch strike: 47%47%Hard hit allowed: 28%28% 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 Hjerpe, Cooper · 2026 arsenal snapshot 4-Seam Fastball: 52.0%Sweeper: 22.8%Changeup: 15.7%Cutter: 9.4% FF52% · 90 mphprimary pitch FF 52%ST 23%CH 16%FC 9% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Hjerpe, Cooper · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 52% usage, 3″ horizontal break, 25″ drop, 90.4 mphFF90 mphSweeper: 23% usage, 4″ horizontal break, 43″ drop, 77.5 mphST78 mphChangeup: 16% usage, 5″ horizontal break, 45″ drop, 81.0 mphCH81 mphCutter: 9% usage, 1″ horizontal break, 29″ drop, 86.2 mphFC86 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 46.1% 83 95 limited sample
SL 28.3% 51 94 limited sample
CH 13.9% 25 74 limited sample
FC 11.7% 21 101 limited sample
Method note

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

Reference layer

Current snapshot

Age25
Height6' 3"
Weight200 lb
Debut2026-09-06
Live layer

Delta / regression

No Live State delta is available for this profile yet.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

No projection links or recent game log rows are available yet.