Mithrandir Metrics
Player Chicago Cubs Refreshed Jun 2 06:00 AM ET
Player profile / Chicago Cubs

Ethan Roberts

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

Cards
0
Modules
0
Live Δ
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Club Chicago Cubs 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.

2026-06-02
ERA preseason3.64
ERA current pace0.68
ERA rolling p503.00
Observed weight22%
ERA
1.27 2.09 3.00 3.91 4.73
FIP
2.69 3.28 3.95 4.61 5.21
K%
13.8% 16.5% 19.5% 22.5% 25.2%
BB%
5.2% 6.7% 8.4% 10.1% 11.6%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-02
Mithrandir+

Stuff+ and arsenal context

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

2026-06-02
Mithrandir Stuff+110
97
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.

3Pitches 2026Season 46%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 Roberts, Ethan · Aggregate zone metrics; not pitch-by-pitch locations Edge: 40%40%Zone: 48%48%Whiff: 22%22%Called strike: 17%17%First pitch strike: 48%48%Hard hit allowed: 50%50% 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 Roberts, Ethan · 2026 arsenal snapshot Cutter: 46.4%Sweeper: 40.7%Sinker: 12.9% MIX FC 46%ST 41%SI 13% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Roberts, Ethan · 2026 arsenal snapshot FC: HB 0.0, IVB 1.4FCST: HB -0.3, IVB 3.3STSI: HB 0.7, IVB 1.8SI horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FC 48.5% 99 109 limited sample
SL 41.2% 84 111 limited sample
SI 10.3% 21 86 limited sample
Method note

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

Reference layer

Current snapshot

Age28
Height5' 10"
Weight180 lb
Debut2022-04-09
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 202620.8% K | 4.17 ERAProjection
2026-04-12 vs PIT0 ER / 1 K0.2 IP
2026-04-05 @ CLE0 ER / 0 K0.2 IP