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

Mason Barnett

P · Bats/Throws R/R · 6' 0", 218 lb · Age 25

Cards
9
Modules
1
Live Δ
yes
Club Athletics Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2025116.8555022.1181.66
2026147.02206250.0501.66
2 Seasons256.972511272.1681.66
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
17
Pitching
percentile
Pitching9 metrics
26
Arsenal5 metrics
33
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 pace7.02
ERA rolling p505.71
Observed weight49%
ERA
4.47 5.05 5.71 6.36 6.94
FIP
4.67 5.05 5.47 5.89 6.27
K%
16.6% 18.5% 20.6% 22.7% 24.5%
BB%
8.8% 9.8% 10.8% 11.9% 12.8%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.68
8
ERA7.02
3
BB%13.0%
10 -36 vs proj
K%21.7%
46
xwOBA allowed0.343
19 -20 vs proj
Barrel allowed8.8%
28
Fastball velo94.9
57
Hard-hit allowed40.1%
37
Whiff%20.1%
27 -19 vs proj
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+94
11
Curveball Stuff+103
54
Fastball Stuff+93
7
Mithrandir Stuff+97
15
Slider Stuff+105
78
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 Barnett, Mason · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.343 2026-09-13: 0.3502026-09-14: 0.3502026-09-18: 0.3502026-09-19: 0.3522026-09-20: 0.3522026-09-21: 0.3522026-09-22: 0.3522026-09-23: 0.3522026-09-24: 0.3522026-09-25: 0.3522026-09-26: 0.3432026-09-27: 0.343 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 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 Barnett, Mason · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 44%44%Whiff: 20%20%Called strike: 16%16%First pitch strike: 45%45%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 Barnett, Mason · 2026 arsenal snapshot 4-Seam Fastball: 49.2%Slider: 17.8%Sweeper: 15.2%Curveball: 10.2%Changeup: 7.6% FF49% · 95 mphprimary pitch FF 49%SL 18%ST 15%CU 10%CH 8% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Barnett, Mason · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 49% usage, 0″ horizontal break, 15″ drop, 94.9 mphFF95 mphSlider: 18% usage, 1″ horizontal break, 38″ drop, 87.3 mphSL87 mphSweeper: 15% usage, 11″ horizontal break, 44″ drop, 83.6 mphST84 mphCurveball: 10% usage, 5″ horizontal break, 60″ drop, 79.0 mphCU79 mphChangeup: 8% usage, 8″ horizontal break, 37″ drop, 85.3 mphCH85 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 49.0% 195 93 limited sample
SL 30.4% 121 105 limited sample
CB 11.1% 44 103 limited sample
CH 9.5% 38 94 limited sample
Method note

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

Reference layer

Current snapshot

Age25
Height6' 0"
Weight218 lb
Debut2025-08-30
Live layer

Delta / regression

ERA Δ+2.09
K% Δ-0.003

positive regression

Regression watch

Unlucky so far. Better days ahead.

1.5σ gap
wOBA-against (actual)0.390
xwOBA-against (deserved)0.343

Barnett’s wOBA-against sits at 0.390, but the quality of contact underneath says it should be 0.343 — a gap of 0.047, 1.5 standard deviations from the MLB norm over 49 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
Pitching92026-09-24Four-Seam Fastball played up through FF/ST tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202622.1% K | 4.93 ERAProjection