Mithrandir Metrics
Player Worcester Red Sox Refreshed Jun 15 06:00 AM ET
Player profile / Worcester Red Sox

Eduardo Rivera

P · Bats/Throws L/L · 6' 7", 237 lb · Age 23

Cards
0
Modules
0
Live Δ
--
Club Worcester Red Sox Position P Roster Reassigned to Minors Status Out / inactive
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2026000.001003.130.30
1 Seasons000.001003.130.30
At a glance

Season percentile report

The headline weighs outcome stats (xwOBA, barrels); each bar averages its full strip group below. 100 = best in MLB.

2026-06-15
91
Pitching
percentile
Arsenal2 metrics
91
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.

2026-06-15
Mithrandir+

Stuff+ and arsenal context

How nasty this pitcher's stuff grades in our pitch-level model. Missing coverage is shown explicitly.

2026-06-15
Fastball Stuff+108
87
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.

Watch the pitches in 3D →

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% FF71% · 95 mphprimary pitch 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 12″24″36″48″ 4-Seam Fastball: 71% usage, 0″ horizontal break, 14″ drop, 94.8 mphFF95 mphSlider: 19% usage, 4″ horizontal break, 38″ drop, 85.2 mphSL85 mphChangeup: 10% usage, 11″ horizontal break, 27″ drop, 88.2 mphCH88 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 68.3% 28 108 limited sample
SL 22.0% 9 111 limited sample
CH 9.8% 4 97 limited sample
Method note

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

Reference layer

Current snapshot

Age23
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