Mithrandir Metrics
Player Pittsburgh Pirates Refreshed Oct 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.

2026-10-27
83
Pitching
percentile
Pitching9 metrics
79
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.

2026-10-27
ERA preseason4.06
ERA current pace2.88
ERA rolling p503.42
Observed weight54%
ERA
1.48 2.40 3.42 4.44 5.36
FIP
2.34 2.60 2.90 3.20 3.46
K%
30.0% 32.0% 34.2% 36.4% 38.4%
BB%
7.2% 8.5% 9.9% 11.4% 12.6%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-10-27
Pitching · percentile strip
WHIP1.04
91
ERA2.88
85
BB%9.5%
44
K%37.5%
100
xwOBA allowed0.247
97 +36 vs proj
Barrel allowed6.0%
75 +41 vs proj
Fastball velo98.6
97
Hard-hit allowed41.3%
29
Whiff%31.0%
95
Mithrandir+

Stuff+ and arsenal context

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

2026-10-27
Fastball Stuff+110
96
Mithrandir Stuff+110
99
Curveball Stuff+104
70
Sinker Stuff+109
93
Slider Stuff+106
82
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 0.314 0.247 2026-10-16: 0.2472026-10-17: 0.2472026-10-18: 0.2472026-10-19: 0.2472026-10-20: 0.2472026-10-21: 0.2472026-10-22: 0.2472026-10-23: 0.2472026-10-24: 0.2472026-10-25: 0.2472026-10-26: 0.2472026-10-27: 0.247 2026-10-16 2026-10-27 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 46%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: 46.4%Sinker: 23.7%Curveball: 13.8%Slider: 13.8%Changeup: 2.2% FF46% · 98 mphprimary pitch FF 46%SI 24%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: 46% usage, 1″ horizontal break, 10″ drop, 98.5 mphFF98 mphSinker: 24% 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, 33″ 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 49.0% 332 110 qualified
SI 24.1% 163 109 limited sample
CB 13.6% 92 104 limited sample
SL 12.3% 83 106 limited sample
CH 1.0% 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-1.12
K% Δ+0.079

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.6σ gap
wOBA-against (actual)0.265
xwOBA-against (deserved)0.247

Montgomery’s wOBA-against sits at 0.265, but the quality of contact underneath says it should be 0.247 — a gap of 0.019, 0.6 standard deviations from the MLB norm over 70 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