Mithrandir Metrics
Player Houston Astros Refreshed Jul 16 06:00 AM ET
Player profile / Houston Astros

Tatsuya Imai

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

Cards
13
Modules
1
Live Δ
yes
Club Houston Astros Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2026546.061313052.0631.50
1 Seasons546.061313052.0631.50
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.

2026-07-16
27
Pitching
percentile
Pitching9 metrics
34
Arsenal5 metrics
12
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.

2026-07-16
Pitching · percentile strip
WHIP1.50
18
ERA6.06
11
BB%14.2%
7
K%27.0%
79
xwOBA allowed0.345
20
Barrel allowed10.5%
15
Fastball velo94.8
55
Hard-hit allowed45.9%
10
Whiff%29.1%
89
Mithrandir+

Stuff+ and arsenal context

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

2026-07-16
Fastball Stuff+94
11
Mithrandir Stuff+94
11
Slider Stuff+96
14
Changeup Stuff+84
1
Sinker Stuff+98
25
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 0.314 0.345 2026-07-05: 0.3402026-07-06: 0.3402026-07-07: 0.3402026-07-08: 0.3402026-07-09: 0.3462026-07-10: 0.3452026-07-11: 0.3452026-07-12: 0.3452026-07-13: 0.3452026-07-14: 0.3452026-07-15: 0.3452026-07-16: 0.345 2026-07-05 2026-07-16 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 45%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: 29%29%Called strike: 15%15%First pitch strike: 46%46%Hard hit allowed: 46%46% 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: 45.0%4-Seam Fastball: 43.3%Sinker: 6.0%Split-Finger: 3.8%Changeup: 1.3%Curveball: 0.6% SL45% · 87 mphprimary pitch SL 45%FF 43%SI 6%FS 4%CH 1%CU 1% 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: 45% usage, 1″ horizontal break, 35″ drop, 86.6 mphSL87 mph4-Seam Fastball: 43% usage, 2″ horizontal break, 20″ drop, 94.8 mphFF95 mphSinker: 6% usage, 9″ horizontal break, 25″ drop, 94.5 mphSI94 mphSplit-Finger: 4% usage, 12″ horizontal break, 35″ drop, 84.8 mphFS85 mphChangeup: 1% usage, 15″ horizontal break, 29″ drop, 86.4 mphCH86 mphCurveball: 1% 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 44.1% 268 96 qualified
FB 43.3% 263 94 qualified
SI 9.0% 55 98 limited sample
CH 2.6% 16 84 limited sample
CB 1.0% 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.

-0.3σ gap
wOBA-against (actual)0.337
xwOBA-against (deserved)0.345

Imai’s wOBA-against sits at 0.337, but the quality of contact underneath says it should be 0.345 — a gap of 0.008, -0.3 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
Pitching132026-07-07Command and chase profile drove 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