Mithrandir Metrics
Player Athletics Refreshed Sep 27 06:00 AM ET
Player profile / Athletics

Jeffrey Springs

P · Bats/Throws L/L · 6' 3", 218 lb · Age 34

Cards
29
Modules
1
Live Δ
yes
Club Athletics Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024223.2777033.0371.36
202511114.1132300171.01381.21
20264146.1829290142.21121.46
9 Seasons38374.22206962627.16091.29
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
26
Pitching
percentile
Pitching9 metrics
31
Arsenal5 metrics
36
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 preseason4.26
ERA current pace6.18
ERA rolling p505.67
Observed weight73%
ERA
4.35 4.98 5.67 6.36 6.99
FIP
4.69 5.08 5.50 5.93 6.31
K%
16.7% 17.6% 18.7% 19.8% 20.7%
BB%
7.4% 8.0% 8.6% 9.3% 9.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.46
29
ERA6.18
8
BB%9.1%
49 -23 vs proj
K%18.1%
22 -21 vs proj
xwOBA allowed0.339
24
Barrel allowed9.1%
24
Fastball velo91.3
10
Hard-hit allowed34.3%
80
Whiff%20.7%
33 -21 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
Changeup Stuff+103
63
Fastball Stuff+99
25
Mithrandir Stuff+100
29
Slider Stuff+103
59
Cutter Stuff+94
3
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 Springs, Jeffrey · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.339 2026-09-13: 0.3372026-09-14: 0.3372026-09-18: 0.3352026-09-19: 0.3352026-09-20: 0.3352026-09-21: 0.3352026-09-22: 0.3352026-09-23: 0.3352026-09-24: 0.3392026-09-25: 0.3392026-09-26: 0.3392026-09-27: 0.339 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 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 Springs, Jeffrey · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 47%47%Whiff: 21%21%Called strike: 16%16%First pitch strike: 47%47%Hard hit allowed: 34%34% 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 Springs, Jeffrey · 2026 arsenal snapshot 4-Seam Fastball: 43.5%Changeup: 24.7%Slider: 21.7%Sweeper: 6.0%Cutter: 4.1% FF44% · 91 mphprimary pitch FF 44%CH 25%SL 22%ST 6%FC 4% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Springs, Jeffrey · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 44% usage, 4″ horizontal break, 16″ drop, 91.3 mphFF91 mphChangeup: 25% usage, 11″ horizontal break, 37″ drop, 79.5 mphCH80 mphSlider: 22% usage, 0″ horizontal break, 36″ drop, 84.2 mphSL84 mphSweeper: 6% usage, 5″ horizontal break, 45″ drop, 77.4 mphST77 mphCutter: 4% usage, 1″ horizontal break, 26″ drop, 87.7 mphFC88 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 43.4% 784 99 qualified
SL 26.6% 481 103 qualified
CH 24.9% 451 103 qualified
FC 5.1% 92 94 limited sample
Method note

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

Reference layer

Current snapshot

Age34
Height6' 3"
Weight218 lb
Debut2018-07-31
Live layer

Delta / regression

ERA Δ+1.42
K% Δ-0.030

positive regression

Regression watch

Unlucky so far. Better days ahead.

1.9σ gap
wOBA-against (actual)0.386
xwOBA-against (deserved)0.339

Springs’s wOBA-against sits at 0.386, but the quality of contact underneath says it should be 0.339 — a gap of 0.047, 1.9 standard deviations from the MLB norm over 148 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
Pitching292026-09-23Four-Seam Fastball played up through CH/FC tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202621.1% K | 4.76 ERAProjection
2026-04-14 vs TEX1 ER / 5 K6.1 IP
2026-04-09 @ NYY0 ER / 6 K7.0 IP
2026-04-03 vs HOU1 ER / 7 K6.0 IP