Mithrandir Metrics
Player Worcester Red Sox Refreshed Jun 1 06:00 AM ET
Player profile / Worcester Red Sox

Zack Kelly

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

Cards
0
Modules
0
Live Δ
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Club Worcester Red Sox Position P Roster Reassigned to Minors Status Out / inactive
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 preseason4.15
ERA current pace3.31
ERA rolling p503.94
Observed weight25%
ERA
2.14 2.99 3.94 4.89 5.75
FIP
2.76 3.40 4.12 4.84 5.48
K%
16.9% 19.4% 22.1% 24.8% 27.3%
BB%
7.0% 8.6% 10.3% 12.0% 13.5%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
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+104
66
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

0 snapshots
No chart yet

No Live State xwOBA snapshots are available for this player.

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 45%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 Kelly, Zack · Aggregate zone metrics; not pitch-by-pitch locations Edge: 41%41%Zone: 46%46%Whiff: 17%17%Called strike: 17%17%First pitch strike: 32%32%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 Kelly, Zack · 2026 arsenal snapshot Cutter: 44.9%Sweeper: 20.9%Sinker: 15.9%4-Seam Fastball: 14.3%Changeup: 3.4%Curveball: 0.6% MIX FC 45%ST 21%SI 16%FF 14%CH 3%CU 1% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Kelly, Zack · 2026 arsenal snapshot FC: HB -0.1, IVB 2.2FCST: HB -0.9, IVB 3.2STSI: HB 1.2, IVB 1.6SIFF: HB -0.2, IVB 1.2FFCH: HB -1.5, IVB 3.1CHCU: HB 0.5, IVB 3.5CU horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FC 43.8% 124 106 limited sample
SL 21.9% 62 102 limited sample
SI 17.0% 48 101 limited sample
FB 13.8% 39 93 limited sample
CH 3.5% 10 102 limited sample
Method note

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

Reference layer

Current snapshot

Age31
Height6' 3"
Weight231 lb
Debut2022-08-29
Live layer

Delta / regression

No Live State delta is available for this profile yet.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202622.6% K | 3.98 ERAProjection
2026-04-20 vs DET0 ER / 1 K1.2 IP
2026-04-12 @ STL1 ER / 2 K2.0 IP
2026-04-07 vs MIL0 ER / 0 K0.2 IP
2026-04-05 vs SD1 ER / 0 K1.0 IP
2026-04-04 vs SD0 ER / 1 K1.0 IP