Mithrandir Metrics
Player Tampa Bay Rays Refreshed Sep 26 06:00 AM ET
Player profile / Tampa Bay Rays

Griffin Jax

P · Bats/Throws R/R · 6' 2", 195 lb · Age 31

Cards
15
Modules
1
Live Δ
yes
Club Tampa Bay Rays Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024552.037201071.0950.87
2025174.23732066.0991.29
20268103.6233220109.11151.19
6 Seasons31413.943323815466.05201.16
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
63
Pitching
percentile
Pitching9 metrics
60
Arsenal7 metrics
89
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 preseason3.81
ERA current pace3.80
ERA rolling p503.80
Observed weight65%
ERA
2.53 3.13 3.80 4.47 5.08
FIP
2.54 3.00 3.52 4.04 4.50
K%
24.1% 25.6% 27.3% 29.0% 30.5%
BB%
6.0% 6.7% 7.4% 8.2% 8.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.20
73
ERA3.80
59
BB%7.7%
68
K%25.3%
73 -17 vs proj
xwOBA allowed0.320
41 -48 vs proj
Barrel allowed8.8%
29
Fastball velo95.6
69
Hard-hit allowed40.1%
38
Whiff%27.8%
86
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
96
Fastball Stuff+109
93
Mithrandir Stuff+109
97
Sinker Stuff+109
92
Slider Stuff+110
96
Curveball Stuff+105
84
Cutter Stuff+103
69
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 Jax, Griffin · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.320 2026-09-12: 0.3282026-09-13: 0.3282026-09-14: 0.3282026-09-18: 0.3222026-09-19: 0.3222026-09-20: 0.3222026-09-21: 0.3202026-09-22: 0.3202026-09-23: 0.3202026-09-24: 0.3202026-09-25: 0.3202026-09-26: 0.320 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 25%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 Jax, Griffin · Aggregate zone metrics; not pitch-by-pitch locations Edge: 35%35%Zone: 45%45%Whiff: 28%28%Called strike: 17%17%First pitch strike: 54%54%Hard hit allowed: 40%40% 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 Jax, Griffin · 2026 arsenal snapshot Sweeper: 25.2%Changeup: 22.6%Sinker: 22.3%4-Seam Fastball: 18.1%Curveball: 8.8%Cutter: 3.0% ST25% · 88 mphprimary pitch ST 25%CH 23%SI 22%FF 18%CU 9%FC 3% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Jax, Griffin · 2026 arsenal snapshot 15″30″45″60″ Sweeper: 25% usage, 2″ horizontal break, 37″ drop, 87.5 mphST88 mphChangeup: 23% usage, 10″ horizontal break, 29″ drop, 90.9 mphCH91 mphSinker: 22% usage, 2″ horizontal break, 19″ drop, 95.3 mphSI95 mph4-Seam Fastball: 18% usage, 4″ horizontal break, 12″ drop, 95.9 mphFF96 mphCurveball: 9% usage, 4″ horizontal break, 52″ drop, 84.9 mphCU85 mphCutter: 3% usage, 1″ horizontal break, 23″ drop, 92.8 mphFC93 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 24.9% 264 110 qualified
SI 21.7% 230 109 qualified
CH 21.1% 224 110 qualified
FB 20.2% 214 109 qualified
CB 8.4% 89 105 limited sample
FC 3.9% 41 103 limited sample
Method note

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

Reference layer

Current snapshot

Age31
Height6' 2"
Weight195 lb
Debut2021-06-08
Live layer

Delta / regression

ERA Δ+0.37
K% Δ-0.039

negative regression

Regression watch

Running hot. Expect some cooling.

-0.1σ gap
wOBA-against (actual)0.317
xwOBA-against (deserved)0.320

Jax’s wOBA-against sits at 0.317, but the quality of contact underneath says it should be 0.320 — a gap of 0.002, -0.1 standard deviations from the MLB norm over 109 IP. The results have outrun the underlying process; as the sample grows, expect the numbers to drift back toward the deserved level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching152026-09-20Four-Seam Fastball played up through SI/ST tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202629.2% K | 3.43 ERAProjection
2026-04-17 @ PIT1 ER / 0 K0.2 IP
2026-04-11 vs NYY0 ER / 1 K0.1 IP
2026-04-05 @ MIN0 ER / 0 K2.0 IP
2026-04-01 @ MIL3 ER / 0 K0.0 IP
2026-03-30 @ MIL0 ER / 1 K1.0 IP