Mithrandir Metrics
Player St. Louis Cardinals Refreshed Jul 18 06:00 AM ET
Player profile / St. Louis Cardinals

Kyle Leahy

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

Cards
18
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
2026743.731818089.1751.41
4 Seasons1283.68116192227.21901.29
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.

2026-07-18
38
Pitching
percentile
Pitching9 metrics
30
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.

2026-07-18
ERA preseason3.73
ERA current pace3.73
ERA rolling p503.73
Observed weight63%
ERA
2.52 3.09 3.73 4.37 4.94
FIP
2.89 3.29 3.73 4.17 4.56
K%
18.4% 19.6% 20.9% 22.2% 23.3%
BB%
6.1% 6.9% 7.7% 8.5% 9.3%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-18
Pitching · percentile strip
WHIP1.41
33
ERA3.73
56
BB%8.3%
56 -17 vs proj
K%19.9%
32
xwOBA allowed0.353
13 -18 vs proj
Barrel allowed10.5%
16 -19 vs proj
Fastball velo94.0
42
Hard-hit allowed49.0%
3
Whiff%19.0%
17 -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.

2026-07-18
Fastball Stuff+101
38
Mithrandir Stuff+103
61
Slider Stuff+108
89
Changeup Stuff+101
43
Curveball Stuff+102
56
Sinker Stuff+103
58
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 0.353 2026-07-07: 0.3592026-07-08: 0.3592026-07-09: 0.3592026-07-10: 0.3592026-07-11: 0.3592026-07-12: 0.3532026-07-13: 0.3532026-07-14: 0.3532026-07-15: 0.3532026-07-16: 0.3532026-07-17: 0.3532026-07-18: 0.353 2026-07-07 2026-07-18 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 28%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: 38%38%Zone: 49%49%Whiff: 19%19%Called strike: 17%17%First pitch strike: 50%50%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: 28.5%Slider: 16.3%Curveball: 15.9%Sinker: 13.4%Changeup: 13.0%Sweeper: 12.9% FF28% · 94 mphprimary pitch FF 28%SL 16%CU 16%SI 13%CH 13%ST 13% 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: 28% usage, 2″ horizontal break, 16″ drop, 94.1 mphFF94 mphSlider: 16% usage, 1″ horizontal break, 30″ drop, 89.2 mphSL89 mphCurveball: 16% usage, 4″ horizontal break, 51″ drop, 82.8 mphCU83 mphSinker: 13% usage, 10″ horizontal break, 20″ drop, 93.8 mphSI94 mphChangeup: 13% usage, 9″ horizontal break, 33″ drop, 88.4 mphCH88 mphSweeper: 13% usage, 8″ horizontal break, 36″ drop, 84.7 mphST85 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% 116 101 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-0.46
K% Δ-0.021

negative regression

Regression watch

Running hot. Expect some cooling.

-0.1σ gap
wOBA-against (actual)0.350
xwOBA-against (deserved)0.353

Leahy’s wOBA-against sits at 0.350, but the quality of contact underneath says it should be 0.353 — a gap of 0.003, -0.1 standard deviations from the MLB norm over 92 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
Pitching182026-07-10Four-Seam Fastball played up through FF/SL 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