Mithrandir Metrics
Player San Francisco Giants Refreshed Jul 18 06:00 AM ET
Player profile / San Francisco Giants

Jt Brubaker

P · Bats/Throws R/R · 6' 4", 197 lb · Age 32

Cards
2
Modules
1
Live Δ
yes
Club San Francisco Giants Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
20223124.6928280144.01471.47
2025003.77171028.2221.22
2026002.87300147.0331.13
5 Seasons9284.65110621391.13791.34
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.

2026-07-18
46
Pitching
percentile
Pitching9 metrics
48
Arsenal6 metrics
24
Rolling projection

Preseason / current pace / Bayesian update

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

2026-07-18
ERA preseason3.81
ERA current pace2.87
ERA rolling p503.39
Observed weight45%
ERA
2.14 2.73 3.39 4.04 4.64
FIP
3.03 3.46 3.95 4.43 4.87
K%
15.3% 17.0% 18.9% 20.8% 22.5%
BB%
7.5% 8.4% 9.4% 10.5% 11.4%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-18
Pitching · percentile strip
WHIP1.14
76
ERA2.87
79
BB%11.2%
22 -29 vs proj
K%17.9%
18
xwOBA allowed0.328
36
Barrel allowed5.8%
78 +33 vs proj
Fastball velo93.6
36
Hard-hit allowed35.5%
72
Whiff%18.2%
12
Mithrandir+

Stuff+ and arsenal context

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

2026-07-18
Mithrandir Stuff+99
30
Sinker Stuff+99
29
Changeup Stuff+100
33
Curveball Stuff+100
16
Fastball Stuff+84
1
Slider Stuff+100
35
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 0.314 0.328 2026-07-07: 0.3292026-07-08: 0.3292026-07-09: 0.3292026-07-10: 0.3292026-07-11: 0.3252026-07-12: 0.3252026-07-13: 0.3282026-07-14: 0.3282026-07-15: 0.3282026-07-16: 0.3282026-07-17: 0.3282026-07-18: 0.328 2026-07-07 2026-07-18 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 49%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: 37%37%Zone: 45%45%Whiff: 18%18%Called strike: 18%18%First pitch strike: 52%52%Hard hit allowed: 36%36% 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 Brubaker, Jt · 2026 arsenal snapshot Sinker: 48.9%Slider: 25.9%Changeup: 11.9%Curveball: 7.5%4-Seam Fastball: 5.8% SI49% · 94 mphprimary pitch SI 49%SL 26%CH 12%CU 7%FF 6% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Brubaker, Jt · 2026 arsenal snapshot 12″24″36″48″ Sinker: 49% usage, 2″ horizontal break, 22″ drop, 93.7 mphSI94 mphSlider: 26% usage, 0″ horizontal break, 33″ drop, 87.2 mphSL87 mphChangeup: 12% usage, 15″ horizontal break, 29″ drop, 88.6 mphCH89 mphCurveball: 7% usage, 5″ horizontal break, 47″ drop, 82.2 mphCU82 mph4-Seam Fastball: 6% usage, 3″ horizontal break, 17″ drop, 93.0 mphFF93 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 49.4% 281 99 qualified
SL 27.9% 159 100 limited sample
CH 10.9% 62 100 limited sample
CB 7.6% 43 100 limited sample
FB 4.2% 24 84 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-1.12
K% Δ-0.015

negative regression

Regression watch

Running hot. Expect some cooling.

-1.3σ gap
wOBA-against (actual)0.286
xwOBA-against (deserved)0.328

Brubaker’s wOBA-against sits at 0.286, but the quality of contact underneath says it should be 0.328 — a gap of 0.042, -1.3 standard deviations from the MLB norm over 48 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
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