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

Eduardo Rivera

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.

Pending

Rolling player projection appears after current-season Statcast and projection joins refresh.

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+109
95
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 71%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 Rivera, Eduardo · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 48%48%Whiff: 33%33%Called strike: 14%14%First pitch strike: 43%43%Hard hit allowed: 55%55% 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 Rivera, Eduardo · 2026 arsenal snapshot 4-Seam Fastball: 70.7%Slider: 19.0%Changeup: 10.3% MIX FF 71%SL 19%CH 10% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Rivera, Eduardo · 2026 arsenal snapshot FF: HB 0.0, IVB 1.1FFSL: HB -0.4, IVB 3.2SLCH: HB -1.0, IVB 2.3CH horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 68.3% 28 108 limited sample
SL 22.0% 9 111 limited sample
CH 9.8% 4 96 limited sample
Method note

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

Reference layer

Current snapshot

Age22
Height6' 7"
Weight237 lb
Debut2026-04-22
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

2026-03-20 @ TB0 ER / 0 K1.0 IP