Mithrandir Metrics
Player Chicago White Sox Refreshed Jun 15 06:00 AM ET
Player profile / Chicago White Sox

Anthony Kay

P · Bats/Throws L/L · 6' 0", 225 lb · Age 31

Cards
14
Modules
1
Live Δ
yes
Club Chicago White Sox Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2022004.501002.031.50
2023006.14160014.2111.50
2026614.341412066.1531.42
6 Seasons1035.0458190151.21411.52
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.

2026-06-15
27
Pitching
percentile
Pitching9 metrics
29
Arsenal6 metrics
34
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-06-15
ERA preseason3.94
ERA current pace4.34
ERA rolling p504.17
Observed weight59%
ERA
2.16 3.12 4.17 5.23 6.19
FIP
3.03 3.79 4.62 5.46 6.22
K%
16.0% 17.5% 19.2% 20.9% 22.4%
BB%
6.6% 7.6% 8.7% 9.8% 10.7%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-15
Pitching · percentile strip
WHIP1.49
22
ERA4.34
37
BB%9.1%
46
K%18.1%
21 -15 vs proj
xwOBA allowed0.365
11 -27 vs proj
Barrel allowed10.9%
17 -32 vs proj
Fastball velo95.4
67
Hard-hit allowed44.8%
18
Whiff%19.6%
21 -15 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-06-15
Fastball Stuff+103
53
Mithrandir Stuff+100
33
Slider Stuff+94
11
Changeup Stuff+99
24
Cutter Stuff+98
14
Sinker Stuff+105
68
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 Kay, Anthony · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.365 2026-06-04: 0.3682026-06-05: 0.3682026-06-06: 0.3722026-06-07: 0.3722026-06-08: 0.3722026-06-09: 0.3722026-06-10: 0.3722026-06-11: 0.3722026-06-12: 0.3722026-06-13: 0.3722026-06-14: 0.3652026-06-15: 0.365 2026-06-04 2026-06-15 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.

6Pitches 2026Season 26%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 Kay, Anthony · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 43%43%Whiff: 20%20%Called strike: 16%16%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 Kay, Anthony · 2026 arsenal snapshot 4-Seam Fastball: 25.5%Sweeper: 19.9%Cutter: 19.0%Sinker: 18.5%Changeup: 13.7%Slider: 3.5% FF26% · 96 mphprimary pitch FF 26%ST 20%FC 19%SI 18%CH 14%SL 3% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Kay, Anthony · 2026 arsenal snapshot 12″24″36″48″ 4-Seam Fastball: 26% usage, 5″ horizontal break, 15″ drop, 95.8 mphFF96 mphSweeper: 20% usage, 2″ horizontal break, 41″ drop, 82.5 mphST82 mphCutter: 19% usage, 1″ horizontal break, 27″ drop, 90.8 mphFC91 mphSinker: 18% usage, 1″ horizontal break, 25″ drop, 95.0 mphSI95 mphChangeup: 14% usage, 13″ horizontal break, 37″ drop, 85.7 mphCH86 mphSlider: 3% usage, 2″ horizontal break, 43″ drop, 85.6 mphSL86 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 26.6% 282 103 qualified
SL 23.1% 245 94 qualified
SI 18.3% 194 105 limited sample
FC 17.9% 190 98 limited sample
CH 14.1% 150 99 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' 0"
Weight225 lb
Debut2019-09-07
Live layer

Delta / regression

ERA Δ+0.39
K% Δ-0.025

positive regression

Regression watch

Unlucky so far. Better days ahead.

2.1σ gap
wOBA-against (actual)0.425
xwOBA-against (deserved)0.365

Kay’s wOBA-against sits at 0.425, but the quality of contact underneath says it should be 0.365 — a gap of 0.060, 2.1 standard deviations from the MLB norm over 73 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
Pitching142026-05-25Sweeper played up through ST/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202620.6% K | 3.95 ERAProjection
2026-04-09 @ KC0 ER / 6 K5.2 IP
2026-04-04 vs TOR2 ER / 0 K4.1 IP
2026-03-29 @ MIL2 ER / 5 K4.2 IP