Mithrandir Metrics
Player Texas Rangers Refreshed Jun 14 06:00 AM ET
Player profile / Texas Rangers

Kumar Rocker

P · Bats/Throws R/R · 6' 5", 245 lb · Age 26

Cards
11
Modules
1
Live Δ
yes
Club Texas Rangers Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024023.8633011.2141.54
2025455.741414064.1561.46
2026253.561312065.2521.34
3 Seasons6124.5730290141.21221.41
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.

2026-06-14
39
Pitching
percentile
Pitching9 metrics
40
Arsenal6 metrics
25
Rolling projection

Preseason / current pace / Bayesian update

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

2026-06-14
ERA preseason4.15
ERA current pace3.56
ERA rolling p503.82
Observed weight55%
ERA
2.74 3.26 3.82 4.39 4.90
FIP
3.25 3.56 3.91 4.25 4.57
K%
18.0% 19.3% 20.8% 22.3% 23.6%
BB%
7.5% 8.2% 9.1% 10.0% 10.8%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-14
Pitching · percentile strip
WHIP1.35
42
ERA3.56
57
BB%10.1%
35 -23 vs proj
K%19.5%
29
xwOBA allowed0.337
29 -20 vs proj
Barrel allowed7.2%
55 +17 vs proj
Fastball velo94.5
52
Hard-hit allowed44.4%
19
Whiff%21.6%
38
Mithrandir+

Stuff+ and arsenal context

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

2026-06-14
Mithrandir Stuff+99
28
Sinker Stuff+102
49
Slider Stuff+95
13
Changeup Stuff+96
15
Cutter Stuff+96
6
Fastball Stuff+101
42
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 Rocker, Kumar · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.337 2026-06-03: 0.3372026-06-04: 0.3372026-06-05: 0.3372026-06-06: 0.3352026-06-07: 0.3352026-06-08: 0.3352026-06-09: 0.3352026-06-10: 0.3352026-06-11: 0.3352026-06-12: 0.3352026-06-13: 0.3372026-06-14: 0.337 2026-06-03 2026-06-14 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 38%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 Rocker, Kumar · Aggregate zone metrics; not pitch-by-pitch locations Edge: 35%35%Zone: 46%46%Whiff: 22%22%Called strike: 14%14%First pitch strike: 45%45%Hard hit allowed: 44%44% 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 Rocker, Kumar · 2026 arsenal snapshot Slider: 37.9%Sinker: 32.7%4-Seam Fastball: 11.5%Cutter: 11.4%Changeup: 6.4%Pitch Out: 0.1% SL38% · 84 mphprimary pitch SL 38%SI 33%FF 12%FC 11%CH 6%PO 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Rocker, Kumar · 2026 arsenal snapshot 12″24″36″48″ Slider: 38% usage, 0″ horizontal break, 42″ drop, 83.6 mphSL84 mphSinker: 33% usage, 2″ horizontal break, 23″ drop, 94.5 mphSI94 mph4-Seam Fastball: 12% usage, 4″ horizontal break, 19″ drop, 94.6 mphFF95 mphCutter: 11% usage, 0″ horizontal break, 27″ drop, 90.5 mphFC90 mphChangeup: 6% usage, 14″ horizontal break, 28″ drop, 88.8 mphCH89 mphPitch Out: 0% usage, 5″ horizontal break, 24″ drop, 90.8 mphPO91 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 38.0% 358 95 qualified
SI 35.2% 331 102 qualified
FB 10.2% 96 101 limited sample
FC 9.6% 90 96 limited sample
CH 7.0% 66 96 limited sample
Method note

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

Reference layer

Current snapshot

Age26
Height6' 5"
Weight245 lb
Debut2024-09-12
Live layer

Delta / regression

ERA Δ-0.67
K% Δ-0.018

negative regression

Regression watch

Running hot. Expect some cooling.

-0.4σ gap
wOBA-against (actual)0.325
xwOBA-against (deserved)0.337

Rocker’s wOBA-against sits at 0.325, but the quality of contact underneath says it should be 0.337 — a gap of 0.012, -0.4 standard deviations from the MLB norm over 69 IP. The results have outrun the underlying process; as the sample grows, expect the numbers to drift back toward the deserved level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching112026-05-25Slider played up through SL/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202621.3% K | 4.23 ERAProjection
2026-04-15 @ ATH2 ER / 6 K4.2 IP
2026-04-04 vs CIN2 ER / 3 K5.0 IP