Mithrandir Metrics
Player St. Louis Cardinals Refreshed Jun 1 06:00 AM ET
Player profile / St. Louis Cardinals

Kyle Leahy

P profile with live context, projection links, and Mithrandir card history when available.

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

Preseason / current pace / Bayesian update

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

2026-06-01
ERA preseason3.73
ERA current pace4.44
ERA rolling p504.11
Observed weight53%
ERA
2.93 3.49 4.11 4.72 5.28
FIP
3.19 3.57 4.00 4.42 4.81
K%
18.0% 19.4% 20.9% 22.4% 23.8%
BB%
5.8% 6.7% 7.7% 8.6% 9.5%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%8.6%
53 -18 vs proj
Barrel allowed10.6%
19 -18 vs proj
Fastball velo93.7
37
Hard-hit allowed47.9%
7
K%19.4%
28 -21 vs proj
Whiff%19.7%
21 -25 vs proj
xwOBA allowed0.383
4 -32 vs proj
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; missing coverage is shown explicitly.

2026-06-01
Mithrandir Stuff+103
61
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 2026-05-17: 0.3832026-05-19: 0.3832026-05-21: 0.3832026-05-23: 0.3832026-05-24: 0.3852026-05-25: 0.3852026-05-26: 0.3852026-05-28: 0.3852026-05-29: 0.3862026-05-30: 0.3862026-05-31: 0.3862026-06-01: 0.383 2026-05-17 2026-06-01 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.

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 Leahy, Kyle · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 48%48%Whiff: 20%20%Called strike: 17%17%First pitch strike: 49%49%Hard hit allowed: 48%48% 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.

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: 30.0%Slider: 15.8%Curveball: 15.1%Sinker: 14.3%Sweeper: 13.1%Changeup: 11.7% MIX FF 30%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 FF: HB -0.1, IVB 1.3FFSL: HB -0.2, IVB 2.5SLCU: HB 0.4, IVB 4.3CUSI: HB 0.8, IVB 1.7SIST: HB -0.9, IVB 3.0STCH: HB -0.8, IVB 2.8CH horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 31.7% 275 101 qualified
SL 27.6% 239 108 qualified
CB 15.2% 132 102 limited sample
SI 13.5% 117 103 limited sample
CH 12.0% 104 102 limited sample
Method note

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

Reference layer

Current snapshot

Age28
Height6' 5"
Weight225 lb
Debut2023-07-07
Live layer

Delta / regression

ERA Δ+0.25
K% Δ-0.025

negative regression

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