Mithrandir Metrics
Player Boston Red Sox Refreshed Sep 26 06:00 AM ET
Player profile / Boston Red Sox

Eduardo Rivera

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

Cards
3
Modules
1
Live Δ
--
Club Boston Red Sox Position P Roster Current MLB team Status IL-60
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2026016.3043010.0101.40
1 Seasons016.3043010.0101.40
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.

2026-09-26
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.

2026-09-26
Mithrandir+

Stuff+ and arsenal context

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

2026-09-26
Fastball Stuff+108
87
Mithrandir Stuff+108
94
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 56%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: 34%34%Zone: 46%46%Whiff: 24%24%Called strike: 14%14%First pitch strike: 46%46%Hard hit allowed: 47%47% 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: 55.9%Slider: 29.5%Changeup: 14.5% FF56% · 95 mphprimary pitch FF 56%SL 30%CH 15% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Rivera, Eduardo · 2026 arsenal snapshot 9″18″27″36″ 4-Seam Fastball: 56% usage, 0″ horizontal break, 14″ drop, 95.2 mphFF95 mphSlider: 30% usage, 1″ horizontal break, 32″ drop, 87.7 mphSL88 mphChangeup: 15% usage, 8″ horizontal break, 29″ drop, 87.1 mphCH87 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% 9 109 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
Pitching32026-07-22Slider played up through SL/FF tunnel quality
Projection links / recent games

Available detail

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