Mithrandir Metrics
Player Texas Rangers Refreshed Jun 1 06:00 AM ET
Player profile / Texas Rangers

Jack Leiter

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

Cards
15
Modules
1
Live Δ
yes
Club Texas Rangers 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 preseason3.96
ERA current pace4.75
ERA rolling p504.40
Observed weight56%
ERA
3.35 3.85 4.40 4.95 5.44
FIP
2.91 3.40 3.95 4.50 5.00
K%
22.2% 23.7% 25.4% 27.0% 28.6%
BB%
7.3% 8.1% 8.9% 9.8% 10.5%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%9.3%
40
Barrel allowed12.2%
8 -37 vs proj
Fastball velo96.6
83
Hard-hit allowed43.4%
27
K%26.6%
78 +21 vs proj
Whiff%25.8%
69
xwOBA allowed0.332
34
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+106
78
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 Leiter, Jack · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.3392026-05-19: 0.3392026-05-21: 0.3392026-05-23: 0.3362026-05-24: 0.3352026-05-25: 0.3352026-05-26: 0.3352026-05-28: 0.3392026-05-29: 0.3392026-05-30: 0.3392026-05-31: 0.3392026-06-01: 0.332 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 38%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 Leiter, Jack · Aggregate zone metrics; not pitch-by-pitch locations Edge: 40%40%Zone: 49%49%Whiff: 26%26%Called strike: 17%17%First pitch strike: 46%46%Hard hit allowed: 43%43% 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 Leiter, Jack · 2026 arsenal snapshot 4-Seam Fastball: 37.7%Changeup: 18.3%Slider: 17.7%Cutter: 10.3%Sinker: 8.1%Curveball: 7.9% MIX FF 38%CH 18%SL 18%FC 10%SI 8%CU 8% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Leiter, Jack · 2026 arsenal snapshot FF: HB -0.1, IVB 1.0FFCH: HB -0.4, IVB 2.5CHSL: HB -0.1, IVB 3.1SLFC: HB -0.0, IVB 1.7FCSI: HB 1.1, IVB 1.3SICU: HB 0.1, IVB 4.5CU horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 38.2% 430 111 qualified
CH 18.0% 203 100 qualified
SL 17.7% 199 104 limited sample
FC 10.5% 118 98 limited sample
CB 7.9% 89 102 limited sample
SI 7.7% 87 103 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' 1"
Weight205 lb
Debut2024-04-18
Live layer

Delta / regression

ERA Δ+0.83
K% Δ+0.028

negative regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching152026-05-26Four-Seam Fastball played up through SL/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202623.8% K | 3.92 ERAProjection
2026-05-20 @ COL4 ER / 5 K5.0 IP
2026-04-11 @ LAD5 ER / 4 K3.2 IP
2026-04-05 vs CIN1 ER / 9 K5.0 IP
2026-03-30 @ BAL2 ER / 8 K6.0 IP