Mithrandir Metrics
Player Seattle Mariners Refreshed Sep 26 06:00 AM ET
Player profile / Seattle Mariners

Cooper Criswell

P · Bats/Throws R/R · 6' 6", 200 lb · Age 30

Cards
3
Modules
1
Live Δ
yes
Club Seattle Mariners Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024654.082618099.1731.35
2025103.5771117.291.58
2026423.40360139.2311.39
6 Seasons1294.2681212194.11441.43
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.

2026-09-26
53
Pitching
percentile
Pitching9 metrics
48
Arsenal6 metrics
72
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-26
ERA preseason4.17
ERA current pace3.38
ERA rolling p503.82
Observed weight44%
ERA
2.60 3.18 3.82 4.46 5.04
FIP
2.96 3.38 3.85 4.31 4.73
K%
15.4% 16.9% 18.5% 20.1% 21.6%
BB%
5.8% 6.7% 7.7% 8.6% 9.5%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.47
26
ERA3.38
73
BB%7.9%
63
K%19.6%
33 +17 vs proj
xwOBA allowed0.297
71 +22 vs proj
Barrel allowed4.4%
90 +40 vs proj
Fastball velo90.7
6
Hard-hit allowed38.5%
49
Whiff%19.4%
23 +16 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-09-26
Changeup Stuff+110
95
Cutter Stuff+99
26
Fastball Stuff+102
47
Mithrandir Stuff+106
86
Sinker Stuff+106
81
Slider Stuff+109
94
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 Criswell, Cooper · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.297 2026-09-12: 0.2932026-09-13: 0.2872026-09-14: 0.2872026-09-18: 0.2892026-09-19: 0.2892026-09-20: 0.2892026-09-21: 0.2962026-09-22: 0.2962026-09-23: 0.2962026-09-24: 0.2932026-09-25: 0.2932026-09-26: 0.297 2026-09-12 2026-09-26 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 27%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 Criswell, Cooper · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 46%46%Whiff: 19%19%Called strike: 17%17%First pitch strike: 53%53%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 Criswell, Cooper · 2026 arsenal snapshot Changeup: 26.9%Sinker: 26.9%Cutter: 22.0%Sweeper: 17.4%4-Seam Fastball: 6.1%Slurve: 0.6% CH27% · 85 mphprimary pitch CH 27%SI 27%FC 22%ST 17%FF 6%SV 1% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Criswell, Cooper · 2026 arsenal snapshot 12″24″36″48″ Changeup: 27% usage, 3″ horizontal break, 44″ drop, 85.2 mphCH85 mphSinker: 27% usage, 5″ horizontal break, 37″ drop, 90.7 mphSI91 mphCutter: 22% usage, 1″ horizontal break, 30″ drop, 87.1 mphFC87 mphSweeper: 17% usage, 5″ horizontal break, 39″ drop, 78.3 mphST78 mph4-Seam Fastball: 6% usage, 1″ horizontal break, 24″ drop, 90.7 mphFF91 mphSlurve: 1% usage, 0″ horizontal break, 43″ drop, 82.1 mphSV82 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 28.0% 129 106 limited sample
CH 26.3% 121 110 limited sample
FC 19.1% 88 99 limited sample
SL 18.7% 86 109 limited sample
FB 7.8% 36 102 limited sample
Method note

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

Reference layer

Current snapshot

Age30
Height6' 6"
Weight200 lb
Debut2021-08-27
Live layer

Delta / regression

ERA Δ-0.80
K% Δ+0.023

positive regression

Regression watch

Unlucky so far. Better days ahead.

2.6σ gap
wOBA-against (actual)0.384
xwOBA-against (deserved)0.297

Criswell’s wOBA-against sits at 0.384, but the quality of contact underneath says it should be 0.297 — a gap of 0.086, 2.6 standard deviations from the MLB norm over 43 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
Pitching32026-03-17Cutter played up through CH/ST tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202617.3% K | 4.18 ERAProjection
2026-05-20 vs CWS0 ER / 1 K1.0 IP
2026-04-20 vs ATH0 ER / 0 K1.0 IP
2026-04-12 vs HOU0 ER / 1 K1.0 IP
2026-04-06 @ TEX0 ER / 0 K1.0 IP
2026-04-01 vs NYY1 ER / 1 K2.0 IP