Mithrandir Metrics
Player Tampa Bay Rays Refreshed Sep 27 06:00 AM ET
Player profile / Tampa Bay Rays

Jonathan Heasley

P · Bats/Throws R/R · 6' 3", 225 lb · Age 29

Cards
0
Modules
0
Live Δ
--
Club Tampa Bay Rays Position P Roster Current MLB team Status IL-60
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2023007.20120015.091.27
20240116.884005.142.44
20260011.251004.022.00
5 Seasons5126.0441240143.0911.49
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
28
Pitching
percentile
Arsenal4 metrics
28
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 preseason3.83
ERA current pace11.25
ERA rolling p504.48
Observed weight9%
ERA
2.02 3.19 4.48 5.77 6.93
FIP
2.45 3.58 4.83 6.08 7.21
K%
10.1% 13.8% 17.9% 22.0% 25.7%
BB%
2.2% 3.8% 5.7% 7.5% 9.2%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
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+102
52
Fastball Stuff+94
11
Mithrandir Stuff+98
20
Slider Stuff+99
31
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.

4Pitches 2026Season 39%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 Heasley, Jonathan · Aggregate zone metrics; not pitch-by-pitch locations Edge: 32%32%Zone: 49%49%Whiff: 13%13%Called strike: 14%14%First pitch strike: 52%52%Hard hit allowed: 61%61% 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 Heasley, Jonathan · 2026 arsenal snapshot 4-Seam Fastball: 38.8%Slider: 31.8%Changeup: 21.2%Curveball: 8.2% FF39% · 91 mphprimary pitch FF 39%SL 32%CH 21%CU 8% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Heasley, Jonathan · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 39% usage, 1″ horizontal break, 15″ drop, 91.4 mphFF91 mphSlider: 32% usage, 2″ horizontal break, 39″ drop, 83.5 mphSL83 mphChangeup: 21% usage, 5″ horizontal break, 40″ drop, 84.2 mphCH84 mphCurveball: 8% usage, 1″ horizontal break, 55″ drop, 79.8 mphCU80 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 39.1% 25 94 limited sample
SL 32.8% 21 99 limited sample
CH 18.8% 12 102 limited sample
CB 9.4% 6 109 limited sample
Method note

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

Reference layer

Current snapshot

Age29
Height6' 3"
Weight225 lb
Debut2021-09-17
Live layer

Delta / regression

No Live State delta is available for this profile yet.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202618.1% K | 3.68 ERAProjection
2026-03-18 @ TEX2 ER / 2 K0.2 IP