Mithrandir Metrics
Player Miami Marlins Refreshed Sep 28 06:00 AM ET
Player profile / Miami Marlins

Eury Pérez

P · Bats/Throws R/R · 6' 8", 220 lb · Age 23

Cards
33
Modules
1
Live Δ
yes
Club Miami Marlins Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2023563.151919091.11081.13
2025764.252020095.11051.05
20268113.9130290159.01701.21
3 Seasons20233.8069680345.23831.14
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.

2026-09-28
59
Pitching
percentile
Pitching9 metrics
59
Arsenal6 metrics
57
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-09-28
ERA preseason4.10
ERA current pace3.91
ERA rolling p503.96
Observed weight74%
ERA
2.54 3.21 3.96 4.71 5.38
FIP
2.95 3.39 3.88 4.37 4.81
K%
23.8% 24.9% 26.0% 27.1% 28.1%
BB%
8.2% 8.8% 9.4% 10.1% 10.7%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-28
Pitching · percentile strip
WHIP1.20
73
ERA3.91
55
BB%10.1%
35 -37 vs proj
K%25.9%
76
xwOBA allowed0.310
54
Barrel allowed9.5%
20 -20 vs proj
Fastball velo98.0
94
Hard-hit allowed39.5%
41
Whiff%26.7%
80
Mithrandir+

Stuff+ and arsenal context

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

2026-09-28
Fastball Stuff+110
96
Mithrandir Stuff+106
83
Sinker Stuff+97
18
Slider Stuff+103
57
Changeup Stuff+100
35
Curveball Stuff+103
54
Rolling form chart

xwOBA allowed snapshot line

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

12 snapshots
Mithrandir Metrics ROLLING XWOBA LINE Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Rolling xwOBA allowed Pérez, Eury · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.310 2026-09-14: 0.3122026-09-18: 0.3122026-09-19: 0.3122026-09-20: 0.3122026-09-21: 0.3172026-09-22: 0.3172026-09-23: 0.3152026-09-24: 0.3152026-09-25: 0.3152026-09-26: 0.3102026-09-27: 0.3102026-09-28: 0.310 2026-09-14 2026-09-28 xwOBA allowed MITHRANDIR · CHARTS
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 37%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 Pérez, Eury · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 46%46%Whiff: 27%27%Called strike: 12%12%First pitch strike: 51%51%Hard hit allowed: 39%39% 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 Pérez, Eury · 2026 arsenal snapshot 4-Seam Fastball: 37.4%Slider: 17.3%Sinker: 16.8%Sweeper: 13.0%Changeup: 8.9%Curveball: 6.6% FF37% · 98 mphprimary pitch FF 37%SL 17%SI 17%ST 13%CH 9%CU 7% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Pérez, Eury · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 37% usage, 1″ horizontal break, 11″ drop, 98.1 mphFF98 mphSlider: 17% usage, 0″ horizontal break, 30″ drop, 88.4 mphSL88 mphSinker: 17% usage, 3″ horizontal break, 15″ drop, 97.6 mphSI98 mphSweeper: 13% usage, 3″ horizontal break, 28″ drop, 83.6 mphST84 mphChangeup: 9% usage, 9″ horizontal break, 24″ drop, 89.9 mphCH90 mphCurveball: 7% usage, 7″ horizontal break, 49″ drop, 80.8 mphCU81 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 40.5% 816 110 qualified
SL 31.1% 627 103 qualified
SI 13.2% 266 97 qualified
CH 8.8% 177 100 limited sample
CB 6.4% 130 103 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' 8"
Weight220 lb
Debut2023-05-12
Live layer

Delta / regression

ERA Δ-0.18
K% Δ+0.022

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.3σ gap
wOBA-against (actual)0.318
xwOBA-against (deserved)0.310

Pérez’s wOBA-against sits at 0.318, but the quality of contact underneath says it should be 0.310 — a gap of 0.008, 0.3 standard deviations from the MLB norm over 166 IP. The results have been worse than the process deserves; as the sample grows, expect the numbers to climb back toward the underlying level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching332026-09-25Four-Seam Fastball played up through SL/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202623.7% K | 4.09 ERAProjection
2026-04-13 @ ATL3 ER / 2 K4.0 IP
2026-04-08 vs CIN2 ER / 6 K5.0 IP
2026-04-03 @ NYY4 ER / 4 K4.0 IP