Mithrandir Metrics
Player Los Angeles Dodgers Refreshed Sep 27 06:00 AM ET
Player profile / Los Angeles Dodgers

Roki Sasaki

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

Cards
23
Modules
1
Live Δ
yes
Club Los Angeles Dodgers Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2025114.46108036.1281.43
2026554.4926230122.11231.32
2 Seasons664.4836310158.21511.34
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
41
Pitching
percentile
Pitching9 metrics
46
Arsenal3 metrics
61
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-27
ERA preseason4.17
ERA current pace4.53
ERA rolling p504.42
Observed weight70%
ERA
2.89 3.61 4.42 5.23 5.95
FIP
3.97 4.40 4.87 5.34 5.77
K%
19.6% 20.9% 22.2% 23.6% 24.9%
BB%
9.0% 9.8% 10.6% 11.4% 12.2%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.40
38
ERA4.53
37
BB%10.5%
31
K%23.1%
59 +23 vs proj
xwOBA allowed0.320
40 +23 vs proj
Barrel allowed10.4%
12 -16 vs proj
Fastball velo97.8
93
Hard-hit allowed43.1%
18
Whiff%27.3%
83 +32 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-09-27
Fastball Stuff+103
58
Mithrandir Stuff+104
65
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 Sasaki, Roki · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.320 2026-09-13: 0.3232026-09-14: 0.3232026-09-18: 0.3232026-09-19: 0.3232026-09-20: 0.3232026-09-21: 0.3232026-09-22: 0.3232026-09-23: 0.3222026-09-24: 0.3222026-09-25: 0.3222026-09-26: 0.3202026-09-27: 0.320 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.

5Pitches 2026Season 42%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: 36%36%Zone: 46%46%Whiff: 27%27%Called strike: 14%14%First pitch strike: 52%52%Hard hit allowed: 43%43% 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: 42.2%Split-Finger: 27.1%Slider: 21.4%Forkball: 9.0%Sinker: 0.4% FF42% · 98 mphprimary pitch FF 42%FS 27%SL 21%FO 9%SI 0% 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: 42% usage, 2″ horizontal break, 13″ drop, 97.8 mphFF98 mphSplit-Finger: 27% usage, 2″ horizontal break, 32″ drop, 90.2 mphFS90 mphSlider: 21% usage, 0″ horizontal break, 38″ drop, 86.6 mphSL87 mphForkball: 9% usage, 1″ horizontal break, 41″ drop, 85.4 mphFO85 mphSinker: 0% 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 66.3% 585 103 qualified
SL 33.7% 298 103 qualified
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-0.16
K% Δ+0.031

positive regression

Regression watch

Unlucky so far. Better days ahead.

1.9σ gap
wOBA-against (actual)0.370
xwOBA-against (deserved)0.320

Sasaki’s wOBA-against sits at 0.370, but the quality of contact underneath says it should be 0.320 — a gap of 0.050, 1.9 standard deviations from the MLB norm over 125 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
Pitching232026-08-26Four-Seam Fastball played up through FF/FS 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