Mithrandir Metrics
Player Washington Nationals Refreshed Jul 16 06:00 AM ET
Player profile / Washington Nationals

Foster Griffin

P · Bats/Throws R/L · 6' 3", 225 lb · Age 30

Cards
16
Modules
1
Live Δ
yes
Club Washington Nationals Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2020100.001001.210.00
2022008.536006.141.89
20261022.7719190110.11091.02
3 Seasons1123.0426190118.11141.05
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
76
Pitching
percentile
Pitching9 metrics
60
Arsenal7 metrics
44
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
WHIP1.03
87
ERA2.77
82
BB%6.0%
87
K%24.4%
63
xwOBA allowed0.304
61
Barrel allowed9.5%
25
Fastball velo91.4
10
Hard-hit allowed36.1%
68
Whiff%23.3%
53
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
Cutter Stuff+106
83
Fastball Stuff+100
33
Mithrandir Stuff+102
46
Changeup Stuff+98
23
Curveball Stuff+102
47
Sinker Stuff+98
22
Slider Stuff+102
53
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 Griffin, Foster · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.304 2026-07-05: 0.3112026-07-06: 0.3112026-07-07: 0.3112026-07-08: 0.3112026-07-09: 0.3112026-07-10: 0.3042026-07-11: 0.3042026-07-12: 0.3042026-07-13: 0.3042026-07-14: 0.3042026-07-15: 0.3042026-07-16: 0.304 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.

7Pitches 2026Season 32%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 Griffin, Foster · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 48%48%Whiff: 23%23%Called strike: 18%18%First pitch strike: 53%53%Hard hit allowed: 36%36% 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 Griffin, Foster · 2026 arsenal snapshot Cutter: 31.5%4-Seam Fastball: 17.1%Sweeper: 14.7%Changeup: 10.4%Curveball: 10.4%Sinker: 10.0% FC32% · 88 mphprimary pitch FC 32%FF 17%ST 15%CH 10%CU 10%SI 10% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Griffin, Foster · 2026 arsenal snapshot 15″30″45″60″ Cutter: 32% usage, 3″ horizontal break, 28″ drop, 88.2 mphFC88 mph4-Seam Fastball: 17% usage, 2″ horizontal break, 16″ drop, 91.5 mphFF92 mphSweeper: 15% usage, 2″ horizontal break, 44″ drop, 79.9 mphST80 mphChangeup: 10% usage, 15″ horizontal break, 32″ drop, 82.4 mphCH82 mphCurveball: 10% usage, 5″ horizontal break, 59″ drop, 77.9 mphCU78 mphSinker: 10% usage, 1″ horizontal break, 23″ drop, 91.3 mphSI91 mphSplit-Finger: 6% usage, 0″ horizontal break, 40″ drop, 81.3 mphFS81 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FC 32.4% 360 106 qualified
FB 18.6% 207 100 qualified
SL 15.3% 170 102 limited sample
CH 11.5% 128 98 limited sample
SI 11.5% 128 98 limited sample
CB 10.6% 118 102 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' 3"
Weight225 lb
Debut2020-07-27
Live layer

Delta / regression

ERA Δ--
K% Δ--

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.1σ gap
wOBA-against (actual)0.306
xwOBA-against (deserved)0.304

Griffin’s wOBA-against sits at 0.306, but the quality of contact underneath says it should be 0.304 — a gap of 0.003, 0.1 standard deviations from the MLB norm over 115 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
Pitching162026-07-08Cutter played up through FC/FS tunnel quality
Projection links / recent games

Available detail

2026-04-11 @ MIL0 ER / 1 K5.1 IP
2026-04-05 vs LAD1 ER / 6 K5.0 IP
2026-03-30 @ PHI2 ER / 5 K5.0 IP