Mithrandir Metrics
Player Miami Marlins Refreshed Jun 1 06:00 AM ET
Player profile / Miami Marlins

Janson Junk

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

Cards
12
Modules
1
Live Δ
yes
Club Miami Marlins Position P Roster Injured 15-Day Status IL-15
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 preseason4.58
ERA current pace4.80
ERA rolling p504.70
Observed weight54%
ERA
3.37 4.00 4.70 5.40 6.03
FIP
2.41 3.19 4.05 4.91 5.68
K%
14.4% 15.7% 17.2% 18.7% 20.0%
BB%
3.4% 4.2% 5.0% 5.8% 6.5%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%5.6%
89
Barrel allowed7.3%
56
Fastball velo94.2
47
Hard-hit allowed41.6%
37
K%16.2%
12
Whiff%14.6%
2
xwOBA allowed0.310
54 +21 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+108
92
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 Junk, Janson · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.3082026-05-19: 0.3082026-05-21: 0.3082026-05-23: 0.3092026-05-24: 0.3092026-05-25: 0.3092026-05-26: 0.3102026-05-28: 0.3102026-05-29: 0.3102026-05-30: 0.3102026-05-31: 0.3102026-06-01: 0.310 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 33%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 Junk, Janson · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 53%53%Whiff: 15%15%Called strike: 17%17%First pitch strike: 50%50%Hard hit allowed: 42%42% 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 Junk, Janson · 2026 arsenal snapshot 4-Seam Fastball: 33.5%Slider: 23.3%Changeup: 19.4%Sweeper: 13.8%Curveball: 7.5%Sinker: 2.5% MIX FF 33%SL 23%CH 19%ST 14%CU 8%SI 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Junk, Janson · 2026 arsenal snapshot FF: HB -0.2, IVB 1.0FFSL: HB 0.0, IVB 2.9SLCH: HB -0.6, IVB 2.8CHST: HB -0.5, IVB 3.4STCU: HB 0.6, IVB 4.7CUSI: HB 0.7, IVB 1.6SI horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 37.0% 353 108 qualified
FB 33.2% 317 108 qualified
CH 19.8% 189 106 limited sample
CB 7.3% 70 105 limited sample
SI 2.6% 25 108 limited sample
Method note

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

Reference layer

Current snapshot

Age30
Height6' 2"
Weight197 lb
Debut2021-09-05
Live layer

Delta / regression

ERA Δ+0.19
K% Δ-0.024

positive regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching122026-05-254-Seam Fastball played up through FF/SL tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202618.6% K | 4.61 ERAProjection
2026-05-20 vs ATL8 ER / 3 K5.0 IP
2026-04-17 vs MIL3 ER / 3 K5.1 IP
2026-04-11 @ DET4 ER / 4 K5.0 IP
2026-04-06 vs CIN2 ER / 3 K7.1 IP
2026-03-31 vs CWS2 ER / 5 K4.1 IP