Mithrandir Metrics
Player San Francisco Giants Refreshed Jun 2 06:00 AM ET
Player profile / San Francisco Giants

Jt Brubaker

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

Cards
2
Modules
1
Live Δ
yes
Club San Francisco Giants 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 preseason3.81
ERA current pace2.96
ERA rolling p503.51
Observed weight35%
ERA
2.21 2.83 3.51 4.19 4.80
FIP
2.78 3.23 3.73 4.24 4.69
K%
15.1% 17.1% 19.2% 21.3% 23.3%
BB%
7.5% 8.6% 9.7% 10.9% 11.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-02
Pitching · percentile strip
BB%12.9%
11 -41 vs proj
Barrel allowed4.4%
88 +41 vs proj
Fastball velo93.7
38
Hard-hit allowed31.9%
86
K%18.2%
21
Whiff%20.2%
26
xwOBA allowed0.340
26 -21 vs proj
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+99
25
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 Brubaker, Jt · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 2026-05-19: 0.3592026-05-21: 0.3552026-05-23: 0.3592026-05-24: 0.3582026-05-25: 0.3582026-05-26: 0.3452026-05-28: 0.3452026-05-29: 0.3462026-05-30: 0.3462026-05-31: 0.3462026-06-01: 0.3402026-06-02: 0.340 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.

5Pitches 2026Season 47%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 Brubaker, Jt · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 43%43%Whiff: 20%20%Called strike: 17%17%First pitch strike: 53%53%Hard hit allowed: 32%32% 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 Brubaker, Jt · 2026 arsenal snapshot Sinker: 47.1%Slider: 27.9%Changeup: 11.9%Curveball: 8.3%4-Seam Fastball: 4.8% MIX SI 47%SL 28%CH 12%CU 8%FF 5% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Brubaker, Jt · 2026 arsenal snapshot SI: HB 0.2, IVB 1.8SISL: HB 0.0, IVB 2.8SLCH: HB -1.2, IVB 2.5CHCU: HB 0.2, IVB 4.0CUFF: HB -0.1, IVB 1.4FF horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 47.9% 227 99 qualified
SL 28.3% 134 100 limited sample
CH 11.4% 54 100 limited sample
CB 8.2% 39 100 limited sample
FB 4.2% 20 78 limited sample
Method note

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

Reference layer

Current snapshot

Age32
Height6' 4"
Weight197 lb
Debut2020-07-26
Live layer

Delta / regression

ERA Δ-1.03
K% Δ-0.012

negative regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching22026-03-07Run prevention outpaced the underlying contact signals
Projection links / recent games

Available detail

Pitcher Projections 202619.4% K | 3.99 ERAProjection
2026-04-15 @ CIN0 ER / 2 K2.0 IP
2026-04-12 @ BAL0 ER / 0 K1.0 IP
2026-04-05 vs NYM0 ER / 0 K1.0 IP
2026-04-03 vs NYM3 ER / 2 K1.1 IP
2026-03-31 @ SD0 ER / 1 K2.0 IP