Mithrandir Metrics
Player Seattle Mariners Refreshed Jun 2 06:00 AM ET
Player profile / Seattle Mariners

George Kirby

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

Cards
19
Modules
1
Live Δ
yes
Club Seattle Mariners 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.

2026-06-02
ERA preseason3.59
ERA current pace3.54
ERA rolling p503.56
Observed weight59%
ERA
2.54 3.02 3.56 4.10 4.58
FIP
3.02 3.29 3.59 3.90 4.17
K%
18.1% 19.5% 21.1% 22.7% 24.2%
BB%
4.3% 4.9% 5.5% 6.2% 6.8%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-02
Pitching · percentile strip
BB%5.8%
88
Barrel allowed5.5%
78 +37 vs proj
Fastball velo96.8
86
Hard-hit allowed43.9%
23
K%19.5%
28 -32 vs proj
Whiff%20.0%
24 -27 vs proj
xwOBA allowed0.294
68
Mithrandir+

Stuff+ and arsenal context

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

2026-06-02
Mithrandir Stuff+108
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 Kirby, George · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 2026-05-19: 0.2862026-05-21: 0.2862026-05-23: 0.2862026-05-24: 0.2922026-05-25: 0.2922026-05-26: 0.2922026-05-28: 0.2922026-05-29: 0.2922026-05-30: 0.2922026-05-31: 0.2942026-06-01: 0.2942026-06-02: 0.294 2026-05-19 2026-06-02 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 31%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 Kirby, George · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 49%49%Whiff: 20%20%Called strike: 15%15%First pitch strike: 51%51%Hard hit allowed: 44%44% 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 Kirby, George · 2026 arsenal snapshot 4-Seam Fastball: 31.3%Sweeper: 27.7%Sinker: 19.7%Knuckle Curve: 9.6%Changeup: 7.9%Cutter: 3.8% MIX FF 31%ST 28%SI 20%KC 10%CH 8%FC 4% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Kirby, George · 2026 arsenal snapshot FF: HB -0.1, IVB 1.4FFST: HB -0.2, IVB 3.3STSI: HB 0.9, IVB 1.8SIKC: HB 0.7, IVB 4.4KCCH: HB -0.6, IVB 2.5CHFC: HB -0.1, IVB 1.7FC horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 31.3% 319 108 qualified
SL 27.2% 277 109 qualified
SI 19.6% 200 108 qualified
CB 10.3% 105 102 limited sample
CH 7.5% 76 106 limited sample
FC 4.1% 42 99 limited sample
Method note

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

Reference layer

Current snapshot

Age28
Height6' 4"
Weight215 lb
Debut2022-05-08
Live layer

Delta / regression

ERA Δ+0.10
K% Δ-0.048

positive regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching192026-05-23Sweeper played up through ST/FF tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202624.2% K | 3.44 ERAProjection
2026-04-13 vs HOU2 ER / 6 K7.2 IP
2026-04-07 @ TEX3 ER / 4 K8.0 IP
2026-04-01 vs NYY4 ER / 6 K6.0 IP
2026-03-27 vs CLE1 ER / 6 K6.0 IP