Mithrandir Metrics
Player Pittsburgh Pirates Refreshed Sep 27 06:00 AM ET
Player profile / Pittsburgh Pirates

Brandon Eisert

P · Bats/Throws L/L · 6' 2", 210 lb · Age 28

Cards
0
Modules
0
Live Δ
yes
Club Pittsburgh Pirates Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024004.053006.221.35
2025384.39723269.2741.44
2026335.52404044.0491.30
3 Seasons6114.7911572120.11251.38
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.

2026-09-27
54
Pitching
percentile
Pitching9 metrics
49
Arsenal5 metrics
23
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-27
ERA preseason4.44
ERA current pace5.52
ERA rolling p504.93
Observed weight46%
ERA
3.42 4.13 4.93 5.73 6.45
FIP
3.18 3.72 4.33 4.93 5.47
K%
20.3% 22.0% 23.9% 25.8% 27.4%
BB%
5.4% 6.4% 7.5% 8.7% 9.7%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.40
36
ERA5.52
17
BB%7.4%
72
K%25.7%
75
xwOBA allowed0.299
69
Barrel allowed7.5%
49 +15 vs proj
Fastball velo89.8
3
Hard-hit allowed40.3%
36
Whiff%28.0%
87
Mithrandir+

Stuff+ and arsenal context

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

2026-09-27
Changeup Stuff+93
10
Fastball Stuff+100
36
Mithrandir Stuff+98
21
Sinker Stuff+96
14
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 Eisert, Brandon · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.299 2026-09-13: 0.2822026-09-14: 0.2822026-09-18: 0.2852026-09-19: 0.2852026-09-20: 0.2852026-09-21: 0.2862026-09-22: 0.2862026-09-23: 0.2862026-09-24: 0.2872026-09-25: 0.2872026-09-26: 0.2992026-09-27: 0.299 2026-09-13 2026-09-27 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 39%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 Eisert, Brandon · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 43%43%Whiff: 28%28%Called strike: 15%15%First pitch strike: 50%50%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 Eisert, Brandon · 2026 arsenal snapshot 4-Seam Fastball: 38.7%Slider: 34.3%Changeup: 19.6%Sinker: 7.0%Sweeper: 0.4% FF39% · 90 mphprimary pitch FF 39%SL 34%CH 20%SI 7%ST 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Eisert, Brandon · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 39% usage, 1″ horizontal break, 19″ drop, 90.0 mphFF90 mphSlider: 34% usage, 1″ horizontal break, 37″ drop, 83.9 mphSL84 mphChangeup: 20% usage, 9″ horizontal break, 34″ drop, 84.8 mphCH85 mphSinker: 7% usage, 14″ horizontal break, 25″ drop, 89.1 mphSI89 mphSweeper: 0% usage, 10″ horizontal break, 41″ drop, 78.9 mphST79 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 44.9% 171 100 limited sample
SL 28.3% 108 100 limited sample
CH 19.2% 73 93 limited sample
SI 7.6% 29 96 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' 2"
Weight210 lb
Debut2024-06-17
Live layer

Delta / regression

ERA Δ+1.30
K% Δ+0.024

positive regression

Regression watch

Unlucky so far. Better days ahead.

2.7σ gap
wOBA-against (actual)0.388
xwOBA-against (deserved)0.299

Eisert’s wOBA-against sits at 0.388, but the quality of contact underneath says it should be 0.299 — a gap of 0.089, 2.7 standard deviations from the MLB norm over 46 IP. The results have been worse than the process deserves; as the sample grows, expect the numbers to climb back toward the underlying level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202623.4% K | 4.22 ERAProjection
2026-05-20 @ SEA0 ER / 1 K1.0 IP
2026-04-14 vs TB2 ER / 1 K1.1 IP
2026-04-12 @ KC2 ER / 1 K1.0 IP