Mithrandir Metrics
Player San Diego Padres Refreshed Sep 1 06:00 AM ET
Player profile / San Diego Padres

Yuki Matsui

P · Bats/Throws L/L · 5' 8", 165 lb · Age 30

Cards
0
Modules
0
Live Δ
yes
Club San Diego Padres Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024423.73640062.2691.16
2025313.98610163.1611.36
2026312.03420053.1581.14
3 Seasons1043.3116701179.11881.23
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.

2026-09-01
68
Pitching
percentile
Pitching9 metrics
64
Arsenal4 metrics
38
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.

2026-09-01
Pitching · percentile strip
WHIP1.17
76
ERA2.13
94
BB%14.1%
7
K%26.4%
79
xwOBA allowed0.276
86
Barrel allowed8.8%
29
Fastball velo91.8
13
Hard-hit allowed28.8%
97
Whiff%32.1%
97
Mithrandir+

Stuff+ and arsenal context

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

2026-09-01
Fastball Stuff+104
59
Mithrandir Stuff+100
33
Sinker Stuff+90
4
Slider Stuff+103
55
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 Matsui, Yuki · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.276 2026-08-21: 0.2822026-08-22: 0.2822026-08-23: 0.2822026-08-24: 0.2822026-08-25: 0.2822026-08-26: 0.2822026-08-27: 0.2782026-08-28: 0.2782026-08-29: 0.2782026-08-30: 0.2772026-08-31: 0.2762026-09-01: 0.276 2026-08-21 2026-09-01 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.

5Pitches 2026Season 36%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 Matsui, Yuki · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 42%42%Whiff: 32%32%Called strike: 15%15%First pitch strike: 55%55%Hard hit allowed: 29%29% 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 Matsui, Yuki · 2026 arsenal snapshot 4-Seam Fastball: 36.3%Slider: 30.5%Split-Finger: 26.8%Sweeper: 3.5%Sinker: 2.9% FF36% · 92 mphprimary pitch FF 36%SL 31%FS 27%ST 3%SI 3% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Matsui, Yuki · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 36% usage, 0″ horizontal break, 13″ drop, 91.9 mphFF92 mphSlider: 31% usage, 2″ horizontal break, 34″ drop, 85.1 mphSL85 mphSplit-Finger: 27% usage, 6″ horizontal break, 36″ drop, 83.4 mphFS83 mphSweeper: 3% usage, 13″ horizontal break, 44″ drop, 81.1 mphST81 mphSinker: 3% usage, 12″ horizontal break, 20″ drop, 91.0 mphSI91 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 50.3% 170 104 limited sample
SL 45.9% 155 103 limited sample
SI 3.8% 13 90 limited sample
Method note

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

Reference layer

Current snapshot

Age30
Height5' 8"
Weight165 lb
Debut2024-03-20
Live layer

Delta / regression

ERA Δ--
K% Δ--

negative regression

Regression watch

Running hot. Expect some cooling.

-0.1σ gap
wOBA-against (actual)0.273
xwOBA-against (deserved)0.276

Matsui’s wOBA-against sits at 0.273, but the quality of contact underneath says it should be 0.276 — a gap of 0.003, -0.1 standard deviations from the MLB norm over 52 IP. The results have outrun the underlying process; as the sample grows, expect the numbers to drift back toward the deserved level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202623.5% K | 4.08 ERAProjection
2026-05-20 vs LAD0 ER / 2 K1.1 IP