Mithrandir Metrics
Player Colorado Rockies Refreshed Jun 1 06:00 AM ET
Player profile / Colorado Rockies

Juan Mejia

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

Cards
2
Modules
1
Live Δ
yes
Club Colorado Rockies 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 preseason3.93
ERA current pace4.62
ERA rolling p504.17
Observed weight35%
ERA
2.76 3.43 4.17 4.92 5.59
FIP
3.02 3.43 3.89 4.34 4.76
K%
19.9% 22.1% 24.5% 26.8% 29.0%
BB%
8.1% 9.4% 11.0% 12.5% 13.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%12.4%
13 -24 vs proj
Barrel allowed3.8%
91 +31 vs proj
Fastball velo97.3
91
Hard-hit allowed40.0%
46
K%24.0%
60
Whiff%28.1%
84 +18 vs proj
xwOBA allowed0.313
49
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+102
50
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 Mejia, Juan · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.2912026-05-19: 0.2912026-05-21: 0.2922026-05-23: 0.2972026-05-24: 0.2972026-05-25: 0.2972026-05-26: 0.2982026-05-28: 0.2982026-05-29: 0.2982026-05-30: 0.2982026-05-31: 0.3102026-06-01: 0.313 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.

5Pitches 2026Season 44%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 Mejia, Juan · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 44%44%Whiff: 28%28%Called strike: 16%16%First pitch strike: 55%55%Hard hit allowed: 40%40% 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 Mejia, Juan · 2026 arsenal snapshot 4-Seam Fastball: 43.5%Sweeper: 41.9%Sinker: 8.5%Changeup: 3.7%Slider: 2.4% MIX FF 44%ST 42%SI 8%CH 4%SL 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Mejia, Juan · 2026 arsenal snapshot FF: HB 0.1, IVB 1.4FFST: HB -0.3, IVB 3.3STSI: HB 0.8, IVB 1.9SICH: HB -0.4, IVB 2.0CHSL: HB 0.0, IVB 2.7SL horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 44.6% 229 102 qualified
FB 42.9% 220 101 qualified
SI 9.0% 46 102 limited sample
CH 3.5% 18 109 limited sample
Method note

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

Reference layer

Current snapshot

Age25
Height6' 3"
Weight210 lb
Debut2025-04-24
Live layer

Delta / regression

ERA Δ+0.30
K% Δ-0.008
Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching22026-04-164-Seam Fastball played up through FF/ST tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202624.9% K | 4.32 ERAProjection
2026-05-20 vs TEX0 ER / 1 K0.2 IP
2026-04-14 @ HOU0 ER / 1 K1.0 IP
2026-04-09 @ SD0 ER / 1 K1.0 IP
2026-04-06 vs HOU0 ER / 1 K1.2 IP
2026-04-04 vs PHI0 ER / 1 K1.0 IP