Mithrandir Metrics
Player St. Louis Cardinals Refreshed Jun 15 06:00 AM ET
Player profile / St. Louis Cardinals

Kyle Leahy

P · Bats/Throws S/R · 6' 5", 225 lb · Age 29

Cards
14
Modules
1
Live Δ
yes
Club St. Louis Cardinals Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024114.07330148.2331.03
2025423.07621188.0801.23
2026534.641313064.0521.59
4 Seasons1073.96111142202.11671.33
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.

2026-06-15
25
Pitching
percentile
Pitching9 metrics
22
Arsenal6 metrics
58
Rolling projection

Preseason / current pace / Bayesian update

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

2026-06-15
ERA preseason3.73
ERA current pace4.64
ERA rolling p504.24
Observed weight56%
ERA
3.06 3.62 4.24 4.86 5.42
FIP
3.21 3.59 4.02 4.45 4.84
K%
17.7% 19.0% 20.4% 21.9% 23.2%
BB%
5.9% 6.7% 7.6% 8.6% 9.4%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-15
Pitching · percentile strip
WHIP1.57
14
ERA4.64
31
BB%8.4%
54 -17 vs proj
K%18.8%
25 -22 vs proj
xwOBA allowed0.389
3 -30 vs proj
Barrel allowed11.4%
10 -27 vs proj
Fastball velo93.7
38
Hard-hit allowed48.6%
5
Whiff%19.0%
18 -29 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-06-15
Fastball Stuff+101
40
Mithrandir Stuff+103
62
Slider Stuff+108
88
Changeup Stuff+102
43
Curveball Stuff+102
55
Sinker Stuff+103
57
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 Leahy, Kyle · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.389 2026-06-04: 0.3832026-06-05: 0.3832026-06-06: 0.3902026-06-07: 0.3902026-06-08: 0.3902026-06-09: 0.3902026-06-10: 0.3902026-06-11: 0.3902026-06-12: 0.3902026-06-13: 0.3902026-06-14: 0.3892026-06-15: 0.389 2026-06-04 2026-06-15 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.

7Pitches 2026Season 29%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 Leahy, Kyle · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 48%48%Whiff: 19%19%Called strike: 17%17%First pitch strike: 49%49%Hard hit allowed: 49%49% 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 Leahy, Kyle · 2026 arsenal snapshot 4-Seam Fastball: 28.7%Slider: 16.1%Curveball: 15.5%Sinker: 14.1%Sweeper: 13.0%Changeup: 12.5% FF29% · 94 mphprimary pitch FF 29%SL 16%CU 15%SI 14%ST 13%CH 12% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Leahy, Kyle · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 29% usage, 2″ horizontal break, 16″ drop, 93.8 mphFF94 mphSlider: 16% usage, 2″ horizontal break, 30″ drop, 89.2 mphSL89 mphCurveball: 15% usage, 5″ horizontal break, 52″ drop, 82.5 mphCU82 mphSinker: 14% usage, 9″ horizontal break, 20″ drop, 93.6 mphSI94 mphSweeper: 13% usage, 9″ horizontal break, 36″ drop, 84.6 mphST85 mphChangeup: 12% usage, 10″ horizontal break, 33″ drop, 88.1 mphCH88 mphPitch Out: 0% usage, 5″ horizontal break, 20″ drop, 92.3 mphPO92 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 30.7% 290 101 qualified
SL 27.6% 261 108 qualified
CB 15.4% 146 102 limited sample
SI 14.0% 132 103 limited sample
CH 12.3% 116 102 limited sample
Method note

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

Reference layer

Current snapshot

Age29
Height6' 5"
Weight225 lb
Debut2023-07-07
Live layer

Delta / regression

ERA Δ+0.45
K% Δ-0.032

negative regression

Regression watch

Running hot. Expect some cooling.

-0.1σ gap
wOBA-against (actual)0.386
xwOBA-against (deserved)0.389

Leahy’s wOBA-against sits at 0.386, but the quality of contact underneath says it should be 0.389 — a gap of 0.003, -0.1 standard deviations from the MLB norm over 68 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
Pitching142026-05-234-Seam Fastball played up through FF/ST tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202621.9% K | 4.19 ERAProjection
2026-04-17 @ HOU3 ER / 6 K5.0 IP
2026-04-11 vs BOS2 ER / 2 K4.0 IP
2026-04-05 @ DET2 ER / 4 K5.0 IP
2026-03-30 vs NYM4 ER / 1 K5.0 IP