Mithrandir Metrics
Player Los Angeles Dodgers Refreshed Jun 12 06:00 AM ET
Player profile / Los Angeles Dodgers

Roki Sasaki

P · Bats/Throws R/R · 6' 2", 187 lb · Age 24

Cards
13
Modules
1
Live Δ
yes
Club Los Angeles Dodgers Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2025114.46108036.1281.43
2026344.761212062.1641.33
2 Seasons454.652220098.2921.37
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.

2026-06-12
39
Pitching
percentile
Pitching9 metrics
43
Arsenal3 metrics
60
Rolling projection

Preseason / current pace / Bayesian update

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

2026-06-12
ERA preseason4.16
ERA current pace4.59
ERA rolling p504.39
Observed weight54%
ERA
2.97 3.64 4.39 5.14 5.82
FIP
3.94 4.33 4.78 5.22 5.62
K%
18.6% 20.3% 22.2% 24.1% 25.9%
BB%
8.9% 9.9% 11.0% 12.1% 13.0%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-12
Pitching · percentile strip
WHIP1.38
37
ERA4.59
32
BB%11.1%
24
K%24.0%
60 +28 vs proj
xwOBA allowed0.322
43 +23 vs proj
Barrel allowed11.5%
10 -25 vs proj
Fastball velo97.3
90
Hard-hit allowed45.4%
14
Whiff%27.3%
78 +30 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-06-12
Fastball Stuff+102
51
Mithrandir Stuff+104
71
Slider Stuff+103
59
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 Sasaki, Roki · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.322 2026-06-01: 0.3362026-06-02: 0.3362026-06-03: 0.3362026-06-04: 0.3362026-06-05: 0.3362026-06-06: 0.3222026-06-07: 0.3222026-06-08: 0.3222026-06-09: 0.3222026-06-10: 0.3222026-06-11: 0.3222026-06-12: 0.322 2026-06-01 2026-06-12 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 44%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 Sasaki, Roki · Aggregate zone metrics; not pitch-by-pitch locations Edge: 34%34%Zone: 47%47%Whiff: 27%27%Called strike: 15%15%First pitch strike: 52%52%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 Sasaki, Roki · 2026 arsenal snapshot 4-Seam Fastball: 43.5%Slider: 21.3%Split-Finger: 18.6%Forkball: 15.8%Sinker: 0.8% FF44% · 97 mphprimary pitch FF 44%SL 21%FS 19%FO 16%SI 1% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Sasaki, Roki · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 44% usage, 1″ horizontal break, 13″ drop, 97.3 mphFF97 mphSlider: 21% usage, 0″ horizontal break, 38″ drop, 86.6 mphSL87 mphSplit-Finger: 19% usage, 2″ horizontal break, 32″ drop, 90.1 mphFS90 mphForkball: 16% usage, 1″ horizontal break, 41″ drop, 85.2 mphFO85 mphSinker: 1% usage, 14″ horizontal break, 18″ drop, 97.1 mphSI97 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 67.2% 391 102 qualified
SL 32.8% 191 103 limited sample
Method note

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

Reference layer

Current snapshot

Age24
Height6' 2"
Weight187 lb
Debut2025-03-19
Live layer

Delta / regression

ERA Δ-0.10
K% Δ+0.040

positive regression

Regression watch

Unlucky so far. Better days ahead.

2.3σ gap
wOBA-against (actual)0.390
xwOBA-against (deserved)0.322

Sasaki’s wOBA-against sits at 0.390, but the quality of contact underneath says it should be 0.322 — a gap of 0.069, 2.3 standard deviations from the MLB norm over 63 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
Pitching132026-05-234-Seam Fastball played up through FF/SL tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202620.0% K | 4.69 ERAProjection
2026-04-12 vs TEX2 ER / 6 K4.0 IP
2026-04-05 @ WSH6 ER / 5 K5.0 IP
2026-03-30 vs CLE1 ER / 4 K4.0 IP