Mithrandir Metrics
Player Pittsburgh Pirates Refreshed Sep 1 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
2026533.07575755.2891.06
3 Seasons664.0412358111.11691.31
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
80
Pitching
percentile
Pitching9 metrics
76
Arsenal5 metrics
87
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
WHIP1.06
88
ERA3.25
75
BB%9.8%
40
K%38.9%
100
xwOBA allowed0.247
97
Barrel allowed7.5%
50
Fastball velo98.6
97
Hard-hit allowed40.0%
38
Whiff%31.4%
95
Mithrandir+

Stuff+ and arsenal context

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

2026-09-01
Fastball Stuff+110
95
Mithrandir Stuff+110
98
Curveball Stuff+103
60
Sinker Stuff+111
98
Slider Stuff+106
85
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 0.247 2026-08-21: 0.2542026-08-22: 0.2542026-08-23: 0.2542026-08-24: 0.2542026-08-25: 0.2492026-08-26: 0.2492026-08-27: 0.2482026-08-28: 0.2482026-08-29: 0.2482026-08-30: 0.2472026-08-31: 0.2472026-09-01: 0.247 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 51%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: 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 Montgomery, Mason · 2026 arsenal snapshot 4-Seam Fastball: 51.1%Sinker: 16.4%Slider: 15.2%Curveball: 14.6%Changeup: 2.7% FF51% · 98 mphprimary pitch FF 51%SI 16%SL 15%CU 15%CH 3% 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: 51% usage, 1″ horizontal break, 10″ drop, 98.4 mphFF98 mphSinker: 16% usage, 6″ horizontal break, 13″ drop, 99.0 mphSI99 mphSlider: 15% usage, 1″ horizontal break, 33″ drop, 89.6 mphSL90 mphCurveball: 15% usage, 1″ horizontal break, 43″ drop, 86.6 mphCU87 mphChangeup: 3% 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 57.8% 290 110 qualified
SL 14.3% 72 106 limited sample
CB 14.1% 71 103 limited sample
SI 12.4% 62 111 limited sample
CH 1.4% 7 114 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--
K% Δ--

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.7σ gap
wOBA-against (actual)0.268
xwOBA-against (deserved)0.247

Montgomery’s wOBA-against sits at 0.268, but the quality of contact underneath says it should be 0.247 — a gap of 0.022, 0.7 standard deviations from the MLB norm over 57 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

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