Mithrandir Metrics
Player Chicago White Sox Refreshed Jul 17 06:00 AM ET
Player profile / Chicago White Sox

Anthony Kay

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

Cards
18
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
2026644.242018093.1761.37
6 Seasons1064.8964250178.21641.48
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.

2026-07-17
31
Pitching
percentile
Pitching9 metrics
35
Arsenal6 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.

2026-07-17
ERA preseason3.94
ERA current pace4.23
ERA rolling p504.13
Observed weight65%
ERA
2.06 3.04 4.13 5.22 6.20
FIP
2.86 3.63 4.50 5.36 6.13
K%
16.2% 17.5% 19.0% 20.4% 21.8%
BB%
6.7% 7.6% 8.5% 9.5% 10.4%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-17
Pitching · percentile strip
WHIP1.44
29
ERA4.23
43
BB%8.8%
48
K%18.0%
19 -18 vs proj
xwOBA allowed0.349
16 -22 vs proj
Barrel allowed9.3%
28 -24 vs proj
Fastball velo95.5
67
Hard-hit allowed41.4%
33
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.

2026-07-17
Cutter Stuff+98
15
Fastball Stuff+103
55
Mithrandir Stuff+100
37
Sinker Stuff+104
66
Slider Stuff+96
15
Changeup Stuff+99
27
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 0.349 2026-07-06: 0.3502026-07-07: 0.3502026-07-08: 0.3502026-07-09: 0.3502026-07-10: 0.3502026-07-11: 0.3502026-07-12: 0.3502026-07-13: 0.3502026-07-14: 0.3502026-07-15: 0.3502026-07-16: 0.3492026-07-17: 0.349 2026-07-06 2026-07-17 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 24%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: 44%44%Whiff: 21%21%Called strike: 16%16%First pitch strike: 47%47%Hard hit allowed: 41%41% 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: 23.8%Sweeper: 21.8%Cutter: 18.0%Sinker: 17.6%Changeup: 14.1%Slider: 4.7% FF24% · 96 mphprimary pitch FF 24%ST 22%FC 18%SI 18%CH 14%SL 5% 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: 24% usage, 5″ horizontal break, 15″ drop, 95.8 mphFF96 mphSweeper: 22% usage, 2″ horizontal break, 41″ drop, 82.5 mphST83 mphCutter: 18% usage, 1″ horizontal break, 27″ drop, 91.0 mphFC91 mphSinker: 18% usage, 0″ horizontal break, 25″ drop, 95.1 mphSI95 mphChangeup: 14% usage, 13″ horizontal break, 37″ drop, 85.9 mphCH86 mphSlider: 5% usage, 2″ horizontal break, 41″ drop, 86.0 mphSL86 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 26.1% 303 103 qualified
SL 24.5% 285 96 qualified
SI 17.8% 207 104 qualified
FC 17.8% 207 98 qualified
CH 13.8% 160 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+0.27
K% Δ-0.026

positive regression

Regression watch

Unlucky so far. Better days ahead.

2.0σ gap
wOBA-against (actual)0.403
xwOBA-against (deserved)0.349

Kay’s wOBA-against sits at 0.403, but the quality of contact underneath says it should be 0.349 — a gap of 0.053, 2.0 standard deviations from the MLB norm over 96 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
Pitching182026-07-09Command and chase profile drove the outing
Projection links / recent games

Available detail

Pitcher Projections 202620.6% K | 3.96 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