Mithrandir Metrics
Player San Francisco Giants Refreshed Sep 1 06:00 AM ET
Player profile / San Francisco Giants

Jt Brubaker

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

Cards
3
Modules
1
Live Δ
yes
Club San Francisco Giants Position P Roster Current MLB team Status IL-10
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
20223124.6928280144.01471.47
2025003.77171028.2221.22
2026003.58411260.1391.24
5 Seasons9284.69121632404.23851.35
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.

2026-09-01
38
Pitching
percentile
Pitching9 metrics
44
Arsenal6 metrics
30
Rolling projection

Preseason / current pace / Bayesian update

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

Pending

Rolling player projection appears after current-season Statcast and projection joins refresh.

Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-01
Pitching · percentile strip
WHIP1.26
63
ERA3.58
64
BB%10.8%
29
K%15.8%
10
xwOBA allowed0.341
22
Barrel allowed5.3%
81
Fastball velo93.6
35
Hard-hit allowed35.3%
74
Whiff%18.3%
14
Mithrandir+

Stuff+ and arsenal context

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

2026-09-01
Mithrandir Stuff+100
30
Sinker Stuff+98
24
Changeup Stuff+102
52
Curveball Stuff+102
40
Fastball Stuff+89
3
Slider Stuff+100
33
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 0.341 2026-08-21: 0.3402026-08-22: 0.3402026-08-23: 0.3402026-08-24: 0.3402026-08-25: 0.3412026-08-26: 0.3412026-08-27: 0.3412026-08-28: 0.3412026-08-29: 0.3412026-08-30: 0.3412026-08-31: 0.3412026-09-01: 0.341 2026-08-21 2026-09-01 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 45%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: 44%44%Whiff: 18%18%Called strike: 17%17%First pitch strike: 51%51%Hard hit allowed: 35%35% 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: 45.1%Slider: 26.3%Changeup: 13.9%Curveball: 8.7%4-Seam Fastball: 6.1% SI45% · 94 mphprimary pitch SI 45%SL 26%CH 14%CU 9%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: 45% usage, 1″ horizontal break, 22″ drop, 93.7 mphSI94 mphSlider: 26% usage, 0″ horizontal break, 33″ drop, 87.1 mphSL87 mphChangeup: 14% usage, 15″ horizontal break, 30″ drop, 88.6 mphCH89 mphCurveball: 9% usage, 5″ horizontal break, 47″ drop, 81.9 mphCU82 mph4-Seam Fastball: 6% usage, 3″ horizontal break, 17″ drop, 93.1 mphFF93 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 46.5% 322 98 qualified
SL 28.2% 195 100 limited sample
CH 11.8% 82 102 limited sample
CB 8.2% 57 102 limited sample
FB 5.2% 36 89 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--
K% Δ--

negative regression

Regression watch

Running hot. Expect some cooling.

-1.3σ gap
wOBA-against (actual)0.303
xwOBA-against (deserved)0.341

Brubaker’s wOBA-against sits at 0.303, but the quality of contact underneath says it should be 0.341 — a gap of 0.039, -1.3 standard deviations from the MLB norm over 61 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
Pitching32026-08-07Stuff and strike quality carried the outing
Projection links / recent games

Available detail

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