Mithrandir Metrics
Player Pittsburgh Pirates Refreshed Oct 17 06:00 AM ET
Player profile / Pittsburgh Pirates

Kirby Yates

P · Bats/Throws L/R · 5' 10", 205 lb · Age 39

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

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024721.176103361.2850.83
2025435.23500341.1521.33
2026253.19461342.1491.20
12 Seasons32293.355181101495.06721.14
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.

2026-10-17
72
Pitching
percentile
Pitching9 metrics
58
Arsenal2 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.

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.

2026-10-17
Pitching · percentile strip
WHIP1.20
72
ERA3.19
78
BB%9.4%
45
K%27.6%
84
xwOBA allowed0.285
81
Barrel allowed5.5%
81
Fastball velo90.8
6
Hard-hit allowed46.4%
5
Whiff%25.1%
68
Mithrandir+

Stuff+ and arsenal context

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

2026-10-17
Fastball Stuff+100
32
Mithrandir Stuff+101
37
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 Yates, Kirby · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.285 2026-10-06: 0.2852026-10-07: 0.2852026-10-08: 0.2852026-10-09: 0.2852026-10-10: 0.2852026-10-11: 0.2852026-10-12: 0.2852026-10-13: 0.2852026-10-14: 0.2852026-10-15: 0.2852026-10-16: 0.2852026-10-17: 0.285 2026-10-06 2026-10-17 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.

3Pitches 2026Season 66%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 Yates, Kirby · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 45%45%Whiff: 25%25%Called strike: 13%13%First pitch strike: 49%49%Hard hit allowed: 46%46% 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 Yates, Kirby · 2026 arsenal snapshot 4-Seam Fastball: 65.6%Split-Finger: 32.3%Sweeper: 2.0% FF66% · 91 mphprimary pitch FF 66%FS 32%ST 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Yates, Kirby · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 66% usage, 0″ horizontal break, 20″ drop, 90.8 mphFF91 mphSplit-Finger: 32% usage, 1″ horizontal break, 40″ drop, 84.4 mphFS84 mphSweeper: 2% usage, 1″ horizontal break, 51″ drop, 74.8 mphST75 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 96.9% 253 100 qualified
SL 3.1% 8 97 limited sample
Method note

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

Reference layer

Current snapshot

Age39
Height5' 10"
Weight205 lb
Debut2014-06-07
Live layer

Delta / regression

ERA Δ--
K% Δ--

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.4σ gap
wOBA-against (actual)0.297
xwOBA-against (deserved)0.285

Yates’s wOBA-against sits at 0.297, but the quality of contact underneath says it should be 0.285 — a gap of 0.012, 0.4 standard deviations from the MLB norm over 43 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
Pitching12026-09-26Four-Seam Fastball played up through FF/FS tunnel quality
Projection links / recent games

Available detail

2026-05-20 vs ATH1 ER / 1 K0.2 IP