Mithrandir Metrics
Player Cleveland Guardians Refreshed Sep 2 06:00 AM ET
Player profile / Cleveland Guardians

Foster Griffin

P · Bats/Throws R/L · 6' 3", 225 lb · Age 31

Cards
24
Modules
1
Live Δ
yes
Club Cleveland Guardians Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2020100.001001.210.00
2022008.536006.141.89
20261543.2127270154.11391.12
3 Seasons1643.3834270162.11441.14
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.

2026-09-02
68
Pitching
percentile
Pitching9 metrics
51
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.

2026-09-02
Pitching · percentile strip
WHIP1.14
81
ERA3.19
76
BB%6.3%
87
K%22.1%
49
xwOBA allowed0.317
45
Barrel allowed9.0%
26
Fastball velo91.5
10
Hard-hit allowed37.8%
55
Whiff%20.5%
30
Mithrandir+

Stuff+ and arsenal context

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

2026-09-02
Cutter Stuff+105
83
Fastball Stuff+99
31
Mithrandir Stuff+102
45
Slider Stuff+102
46
Changeup Stuff+100
32
Curveball Stuff+102
46
Sinker Stuff+98
22
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 0.313 0.317 2026-08-22: 0.3152026-08-23: 0.3152026-08-24: 0.3152026-08-25: 0.3172026-08-26: 0.3172026-08-27: 0.3172026-08-28: 0.3172026-08-29: 0.3172026-08-30: 0.3162026-08-31: 0.3162026-09-01: 0.3162026-09-02: 0.317 2026-08-22 2026-09-02 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: 21%21%Called strike: 18%18%First pitch strike: 53%53%Hard hit allowed: 38%38% 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: 31.8%4-Seam Fastball: 17.0%Sweeper: 14.5%Changeup: 11.1%Sinker: 9.9%Curveball: 9.4% FC32% · 88 mphprimary pitch FC 32%FF 17%ST 15%CH 11%SI 10%CU 9% 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, 27″ drop, 88.4 mphFC88 mph4-Seam Fastball: 17% usage, 2″ horizontal break, 17″ drop, 91.6 mphFF92 mphSweeper: 15% usage, 1″ horizontal break, 44″ drop, 80.1 mphST80 mphChangeup: 11% usage, 14″ horizontal break, 33″ drop, 82.4 mphCH82 mphSinker: 10% usage, 0″ horizontal break, 22″ drop, 91.4 mphSI91 mphCurveball: 9% usage, 5″ horizontal break, 59″ drop, 77.9 mphCU78 mphSplit-Finger: 6% usage, 0″ horizontal break, 41″ drop, 81.4 mphFS81 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FC 32.9% 446 105 qualified
FB 18.8% 255 99 qualified
SL 15.2% 206 102 qualified
CH 11.6% 157 100 limited sample
SI 11.4% 155 98 limited sample
CB 10.2% 138 102 limited sample
Method note

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

Reference layer

Current snapshot

Age31
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.

0.3σ gap
wOBA-against (actual)0.323
xwOBA-against (deserved)0.317

Griffin’s wOBA-against sits at 0.323, but the quality of contact underneath says it should be 0.317 — a gap of 0.006, 0.3 standard deviations from the MLB norm over 158 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
Pitching242026-08-29Cutter played up through FC/ST 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