Mithrandir Metrics
Player SF Refreshed Sep 1 06:00 AM ET
Player profile / SF

Spencer Bivens

Player · Bats/Throws R/R · 6' 4", 220 lb · Age 32

Cards
2
Modules
1
Live Δ
--
Club SF Position -- Roster profile Status Out / inactive
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024313.14272148.2371.19
2025434.00540381.0611.33
20260014.404005.083.00
3 Seasons744.088524134.21061.34
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.

2026-09-01
71
Pitching
percentile
Arsenal3 metrics
71
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.

2026-09-01
Mithrandir+

Stuff+ and arsenal context

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

2026-09-01
Mithrandir Stuff+102
49
Sinker Stuff+109
96
Slider Stuff+104
67
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

0 snapshots
No chart yet

No Live State xwOBA snapshots are available for this player.

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.

6Pitches 2026Season 43%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 Bivens, Spencer · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 51%51%Whiff: 17%17%Called strike: 20%20%First pitch strike: 50%50%Hard hit allowed: 45%45% 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 Bivens, Spencer · 2026 arsenal snapshot Sinker: 43.2%Sweeper: 24.4%Cutter: 11.4%4-Seam Fastball: 11.4%Changeup: 7.4%Slurve: 2.3% SI43% · 95 mphprimary pitch SI 43%ST 24%FC 11%FF 11%CH 7%SV 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Bivens, Spencer · 2026 arsenal snapshot 12″24″36″48″ Sinker: 43% usage, 8″ horizontal break, 27″ drop, 94.7 mphSI95 mphSweeper: 24% usage, 7″ horizontal break, 37″ drop, 81.6 mphST82 mphCutter: 11% usage, 1″ horizontal break, 28″ drop, 89.1 mphFC89 mph4-Seam Fastball: 11% usage, 2″ horizontal break, 18″ drop, 94.8 mphFF95 mphChangeup: 7% usage, 7″ horizontal break, 35″ drop, 87.5 mphCH88 mphSlurve: 2% usage, 2″ horizontal break, 46″ drop, 81.1 mphSV81 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 34.4% 11 109 limited sample
SL 34.4% 11 104 limited sample
FB 15.6% 5 89 limited sample
CH 12.5% 4 84 limited sample
FC 3.1% 1 117 limited sample
Method note

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

Reference layer

Current snapshot

MLB bio context is unavailable.
Live layer

Delta / regression

No Live State delta is available for this profile yet.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching22026-03-23Stuff and strike quality carried the outing
Projection links / recent games

Available detail

No projection links or recent game log rows are available yet.