Mithrandir Metrics
Player Arizona Diamondbacks Refreshed Sep 26 06:00 AM ET
Player profile / Arizona Diamondbacks

Zack Littell

P · Bats/Throws R/R · 6' 4", 250 lb · Age 30

Cards
12
Modules
1
Live Δ
yes
Club Arizona Diamondbacks Position P Roster Current MLB team Status Out / inactive
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
20248103.6329290156.11411.25
20251083.8132320186.21301.10
2026885.2126140124.1731.41
9 Seasons42374.11260933727.05691.25
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
24
Pitching
percentile
Pitching9 metrics
17
Arsenal4 metrics
29
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.

2026-09-26
Pitching · percentile strip
WHIP1.46
27
ERA5.21
22
BB%7.9%
64
K%13.6%
4
xwOBA allowed0.384
3
Barrel allowed11.1%
7
Fastball velo91.5
11
Hard-hit allowed43.9%
15
Whiff%14.9%
3
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+98
22
Mithrandir Stuff+100
31
Slider Stuff+98
20
Sinker Stuff+101
42
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 Littell, Zack · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.384 2026-09-12: 0.3842026-09-13: 0.3842026-09-14: 0.3842026-09-18: 0.3842026-09-19: 0.3842026-09-20: 0.3842026-09-21: 0.3842026-09-22: 0.3842026-09-23: 0.3842026-09-24: 0.3842026-09-25: 0.3842026-09-26: 0.384 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.

7Pitches 2026Season 28%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 Littell, Zack · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 49%49%Whiff: 15%15%Called strike: 15%15%First pitch strike: 50%50%Hard hit allowed: 44%44% 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 Littell, Zack · 2026 arsenal snapshot Slider: 28.2%4-Seam Fastball: 25.3%Split-Finger: 23.4%Sinker: 14.3%Sweeper: 8.7%Pitch Out: 0.0% SL28% · 88 mphprimary pitch SL 28%FF 25%FS 23%SI 14%ST 9%PO 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Littell, Zack · 2026 arsenal snapshot 12″24″36″48″ Slider: 28% usage, 0″ horizontal break, 25″ drop, 88.1 mphSL88 mph4-Seam Fastball: 25% usage, 2″ horizontal break, 16″ drop, 91.6 mphFF92 mphSplit-Finger: 23% usage, 4″ horizontal break, 38″ drop, 84.0 mphFS84 mphSinker: 14% usage, 1″ horizontal break, 21″ drop, 91.3 mphSI91 mphSweeper: 9% usage, 5″ horizontal break, 48″ drop, 79.2 mphST79 mphPitch Out: 0% usage, 6″ horizontal break, 19″ drop, 88.8 mphPO89 mphUnknown: 0% usage, 3″ horizontal break, 39″ drop, 73.8 mphUN74 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 46.9% 414 98 qualified
FB 33.9% 299 98 qualified
SI 19.2% 169 101 limited sample
Method note

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

Reference layer

Current snapshot

Age30
Height6' 4"
Weight250 lb
Debut2018-06-05
Live layer

Delta / regression

ERA Δ--
K% Δ--

negative regression

Regression watch

Running hot. Expect some cooling.

-0.1σ gap
wOBA-against (actual)0.382
xwOBA-against (deserved)0.384

Littell’s wOBA-against sits at 0.382, but the quality of contact underneath says it should be 0.384 — a gap of 0.002, -0.1 standard deviations from the MLB norm over 125 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
Pitching122026-07-29Slider played up through FS/ST tunnel quality
Projection links / recent games

Available detail

2026-05-20 vs NYM2 ER / 3 K5.0 IP
2026-04-17 vs SF8 ER / 4 K4.0 IP
2026-04-12 @ MIL3 ER / 3 K5.0 IP
2026-04-06 vs STL1 ER / 6 K5.0 IP
2026-03-31 @ PHI3 ER / 1 K5.0 IP