Mithrandir Metrics
Player Detroit Tigers Refreshed Sep 26 06:00 AM ET
Player profile / Detroit Tigers

Keider Montero

P · Bats/Throws R/R · 6' 1", 145 lb · Age 26

Cards
21
Modules
1
Live Δ
yes
Club Detroit Tigers Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024664.761916098.1771.33
2025534.372012090.2721.39
20261093.4832251155.01071.04
3 Seasons21184.0871531344.02561.22
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.

2026-09-26
68
Pitching
percentile
Pitching9 metrics
57
Arsenal6 metrics
67
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-26
ERA preseason4.09
ERA current pace3.58
ERA rolling p503.72
Observed weight72%
ERA
2.60 3.13 3.72 4.31 4.84
FIP
3.42 3.78 4.19 4.59 4.95
K%
15.9% 16.8% 17.8% 18.8% 19.7%
BB%
5.2% 5.7% 6.3% 6.8% 7.3%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.05
90
ERA3.58
67
BB%5.9%
90 +21 vs proj
K%17.1%
15
xwOBA allowed0.290
77 +53 vs proj
Barrel allowed7.2%
55 +19 vs proj
Fastball velo94.4
51
Hard-hit allowed36.5%
65
Whiff%16.5%
6
Mithrandir+

Stuff+ and arsenal context

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

2026-09-26
Changeup Stuff+103
54
Curveball Stuff+105
90
Fastball Stuff+105
68
Mithrandir Stuff+104
72
Sinker Stuff+101
36
Slider Stuff+106
83
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 Montero, Keider · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.290 2026-09-12: 0.2922026-09-13: 0.2922026-09-14: 0.2922026-09-18: 0.2942026-09-19: 0.2942026-09-20: 0.2942026-09-21: 0.2942026-09-22: 0.2902026-09-23: 0.2902026-09-24: 0.2902026-09-25: 0.2902026-09-26: 0.290 2026-09-12 2026-09-26 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.

6Pitches 2026Season 30%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 Montero, Keider · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 52%52%Whiff: 16%16%Called strike: 18%18%First pitch strike: 50%50%Hard hit allowed: 36%36% 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 Montero, Keider · 2026 arsenal snapshot 4-Seam Fastball: 30.0%Sinker: 23.0%Slider: 19.6%Knuckle Curve: 13.8%Changeup: 13.6%Unknown: 0.0% FF30% · 94 mphprimary pitch FF 30%SI 23%SL 20%KC 14%CH 14%UN 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Montero, Keider · 2026 arsenal snapshot 6″12″18″24″ 4-Seam Fastball: 30% usage, 0″ horizontal break, 1″ drop, 94.3 mphFF94 mphSinker: 23% usage, 1″ horizontal break, 2″ drop, 94.6 mphSI95 mphSlider: 20% usage, 0″ horizontal break, 3″ drop, 86.0 mphSL86 mphKnuckle Curve: 14% usage, 0″ horizontal break, 4″ drop, 80.3 mphKC80 mphChangeup: 14% usage, 1″ horizontal break, 2″ drop, 87.0 mphCH87 mphUnknown: 0% usage, 1″ horizontal break, 9″ drop, 51.9 mphUN52 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 32.0% 513 105 qualified
SI 21.4% 344 101 qualified
SL 18.7% 300 106 qualified
CH 14.5% 232 103 qualified
CB 13.4% 215 105 qualified
Method note

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

Reference layer

Current snapshot

Age26
Height6' 1"
Weight145 lb
Debut2024-05-29
Live layer

Delta / regression

ERA Δ-1.51
K% Δ-0.014

negative regression

Regression watch

Running hot. Expect some cooling.

-0.2σ gap
wOBA-against (actual)0.285
xwOBA-against (deserved)0.290

Montero’s wOBA-against sits at 0.285, but the quality of contact underneath says it should be 0.290 — a gap of 0.006, -0.2 standard deviations from the MLB norm over 154 IP. The results have outrun the underlying process; as the sample grows, expect the numbers to drift back toward the deserved level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching212026-09-09Four-Seam Fastball played up through KC/CH tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202618.5% K | 5.09 ERAProjection
2026-04-05 vs STL2 ER / 3 K4.1 IP