Mithrandir Metrics
Player Houston Astros Refreshed Sep 27 06:00 AM ET
Player profile / Houston Astros

Tatsuya Imai

P · Bats/Throws R/R · 5' 11", 176 lb · Age 28

Cards
15
Modules
1
Live Δ
yes
Club Houston Astros Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2026644.932315076.2971.42
1 Seasons644.932315076.2971.42
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.

2026-09-27
36
Pitching
percentile
Pitching9 metrics
40
Arsenal5 metrics
14
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.

2026-09-27
Pitching · percentile strip
WHIP1.44
30
ERA5.00
25
BB%15.2%
3
K%28.7%
89
xwOBA allowed0.330
31
Barrel allowed9.2%
23
Fastball velo94.8
55
Hard-hit allowed44.6%
12
Whiff%30.0%
93
Mithrandir+

Stuff+ and arsenal context

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

2026-09-27
Fastball Stuff+95
14
Mithrandir Stuff+95
11
Slider Stuff+95
11
Changeup Stuff+85
1
Sinker Stuff+99
30
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 Imai, Tatsuya · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.330 2026-09-13: 0.3342026-09-14: 0.3342026-09-18: 0.3352026-09-19: 0.3352026-09-20: 0.3352026-09-21: 0.3302026-09-22: 0.3302026-09-23: 0.3302026-09-24: 0.3302026-09-25: 0.3302026-09-26: 0.3302026-09-27: 0.330 2026-09-13 2026-09-27 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 46%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 Imai, Tatsuya · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 44%44%Whiff: 30%30%Called strike: 16%16%First pitch strike: 47%47%Hard hit allowed: 45%45% 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 Imai, Tatsuya · 2026 arsenal snapshot Slider: 45.7%4-Seam Fastball: 44.2%Sinker: 4.2%Split-Finger: 2.9%Changeup: 2.6%Curveball: 0.4% SL46% · 87 mphprimary pitch SL 46%FF 44%SI 4%FS 3%CH 3%CU 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Imai, Tatsuya · 2026 arsenal snapshot 15″30″45″60″ Slider: 46% usage, 1″ horizontal break, 36″ drop, 86.6 mphSL87 mph4-Seam Fastball: 44% usage, 2″ horizontal break, 20″ drop, 94.8 mphFF95 mphSinker: 4% usage, 9″ horizontal break, 25″ drop, 94.5 mphSI94 mphSplit-Finger: 3% usage, 12″ horizontal break, 35″ drop, 84.7 mphFS85 mphChangeup: 3% usage, 11″ horizontal break, 29″ drop, 86.8 mphCH87 mphCurveball: 0% usage, 8″ horizontal break, 54″ drop, 77.6 mphCU78 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 44.5% 341 95 qualified
FB 44.3% 340 95 qualified
SI 7.2% 55 99 limited sample
CH 3.3% 25 85 limited sample
CB 0.8% 6 101 limited sample
Method note

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

Reference layer

Current snapshot

Age28
Height5' 11"
Weight176 lb
Debut2026-03-29
Live layer

Delta / regression

ERA Δ--
K% Δ--

negative regression

Regression watch

Running hot. Expect some cooling.

-0.6σ gap
wOBA-against (actual)0.313
xwOBA-against (deserved)0.330

Imai’s wOBA-against sits at 0.313, but the quality of contact underneath says it should be 0.330 — a gap of 0.017, -0.6 standard deviations from the MLB norm over 76 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
Pitching152026-07-27Stuff and strike quality carried the outing
Projection links / recent games

Available detail

2026-04-04 @ ATH0 ER / 9 K5.2 IP
2026-03-29 vs LAA4 ER / 4 K2.2 IP