Mithrandir Metrics
Player San Diego Padres Refreshed Sep 26 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
2026411.84530163.2671.15
3 Seasons1143.1817802189.21971.22
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
69
Pitching
percentile
Pitching9 metrics
67
Arsenal4 metrics
39
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-26
ERA preseason4.02
ERA current pace1.92
ERA rolling p502.93
Observed weight52%
ERA
1.49 2.17 2.93 3.68 4.36
FIP
3.19 3.65 4.16 4.66 5.12
K%
21.8% 23.5% 25.5% 27.5% 29.2%
BB%
9.5% 10.7% 12.1% 13.4% 14.6%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.17
77
ERA1.92
97
BB%13.7%
7 -21 vs proj
K%25.6%
74
xwOBA allowed0.271
89 +41 vs proj
Barrel allowed7.2%
54
Fastball velo91.9
14
Hard-hit allowed30.7%
94
Whiff%29.9%
93
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+104
61
Mithrandir Stuff+100
33
Sinker Stuff+85
2
Slider Stuff+103
61
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 0.271 2026-09-12: 0.2742026-09-13: 0.2742026-09-14: 0.2702026-09-18: 0.2682026-09-19: 0.2682026-09-20: 0.2682026-09-21: 0.2692026-09-22: 0.2692026-09-23: 0.2692026-09-24: 0.2712026-09-25: 0.2712026-09-26: 0.271 2026-09-12 2026-09-26 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 38%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: 30%30%Called strike: 15%15%First pitch strike: 53%53%Hard hit allowed: 31%31% 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: 38.1%Slider: 30.2%Split-Finger: 26.0%Sinker: 2.9%Sweeper: 2.9% FF38% · 92 mphprimary pitch FF 38%SL 30%FS 26%SI 3%ST 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: 38% usage, 0″ horizontal break, 13″ drop, 92.0 mphFF92 mphSlider: 30% usage, 2″ horizontal break, 35″ drop, 84.9 mphSL85 mphSplit-Finger: 26% usage, 6″ horizontal break, 36″ drop, 83.5 mphFS83 mphSinker: 3% usage, 12″ horizontal break, 21″ drop, 90.9 mphSI91 mphSweeper: 3% usage, 13″ horizontal break, 44″ drop, 81.1 mphST81 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 52.2% 224 104 qualified
SL 43.8% 188 103 limited sample
SI 4.0% 17 85 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-2.11
K% Δ+0.020

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.1σ gap
wOBA-against (actual)0.273
xwOBA-against (deserved)0.271

Matsui’s wOBA-against sits at 0.273, but the quality of contact underneath says it should be 0.271 — a gap of 0.002, 0.1 standard deviations from the MLB norm over 62 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
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202623.5% K | 4.03 ERAProjection
2026-05-20 vs LAD0 ER / 2 K1.1 IP