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

Mason Montgomery

P · Bats/Throws L/L · 6' 2", 205 lb · Age 26

Cards
3
Modules
1
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
2024001.869009.2171.14
2025135.67570146.0631.65
2026642.887051868.21051.03
3 Seasons773.84136519124.11851.27
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
84
Pitching
percentile
Pitching9 metrics
80
Arsenal5 metrics
88
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 preseason4.06
ERA current pace2.55
ERA rolling p503.24
Observed weight54%
ERA
1.31 2.22 3.24 4.26 5.18
FIP
2.36 2.63 2.93 3.23 3.49
K%
29.8% 31.8% 34.0% 36.2% 38.2%
BB%
7.3% 8.6% 10.0% 11.4% 12.7%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.05
89
ERA2.55
91
BB%9.6%
43
K%37.2%
99
xwOBA allowed0.249
97 +36 vs proj
Barrel allowed6.0%
73 +39 vs proj
Fastball velo98.5
97
Hard-hit allowed40.9%
32
Whiff%30.9%
95
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
Fastball Stuff+110
96
Mithrandir Stuff+110
98
Curveball Stuff+103
69
Sinker Stuff+109
91
Slider Stuff+106
84
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 Montgomery, Mason · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.249 2026-09-13: 0.2522026-09-14: 0.2502026-09-18: 0.2512026-09-19: 0.2512026-09-20: 0.2512026-09-21: 0.2502026-09-22: 0.2502026-09-23: 0.2502026-09-24: 0.2502026-09-25: 0.2502026-09-26: 0.2472026-09-27: 0.249 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 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 Montgomery, Mason · Aggregate zone metrics; not pitch-by-pitch locations Edge: 35%35%Zone: 48%48%Whiff: 31%31%Called strike: 16%16%First pitch strike: 53%53%Hard hit allowed: 41%41% 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 Montgomery, Mason · 2026 arsenal snapshot 4-Seam Fastball: 46.6%Sinker: 23.4%Curveball: 14.1%Slider: 13.7%Changeup: 2.3% FF47% · 98 mphprimary pitch FF 47%SI 23%CU 14%SL 14%CH 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Montgomery, Mason · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 47% usage, 1″ horizontal break, 10″ drop, 98.5 mphFF98 mphSinker: 23% usage, 6″ horizontal break, 13″ drop, 98.7 mphSI99 mphCurveball: 14% usage, 1″ horizontal break, 43″ drop, 86.5 mphCU86 mphSlider: 14% usage, 1″ horizontal break, 32″ drop, 89.6 mphSL90 mphChangeup: 2% usage, 9″ horizontal break, 23″ drop, 90.2 mphCH90 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 50.1% 322 110 qualified
SI 22.6% 145 109 limited sample
CB 13.8% 89 103 limited sample
SL 12.4% 80 106 limited sample
CH 1.1% 7 117 limited sample
Method note

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

Reference layer

Current snapshot

Age26
Height6' 2"
Weight205 lb
Debut2024-09-05
Live layer

Delta / regression

ERA Δ-1.45
K% Δ+0.076

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.6σ gap
wOBA-against (actual)0.268
xwOBA-against (deserved)0.249

Montgomery’s wOBA-against sits at 0.268, but the quality of contact underneath says it should be 0.249 — a gap of 0.019, 0.6 standard deviations from the MLB norm over 69 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
Pitching32026-07-18Stuff and strike quality carried the outing
Projection links / recent games

Available detail

Pitcher Projections 202629.6% K | 4.00 ERAProjection
2026-04-17 vs TB0 ER / 2 K1.0 IP
2026-04-15 vs WSH0 ER / 1 K1.0 IP
2026-04-14 vs WSH0 ER / 2 K1.0 IP
2026-04-11 @ CHC0 ER / 2 K1.0 IP
2026-04-05 vs BAL1 ER / 3 K1.0 IP