Mithrandir Metrics
Player Texas Rangers Refreshed Jul 18 06:00 AM ET
Player profile / Texas Rangers

Kumar Rocker

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

Cards
14
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
2026284.401816090.0801.37
3 Seasons6154.8835330166.01501.42
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.

2026-07-18
39
Pitching
percentile
Pitching9 metrics
41
Arsenal6 metrics
29
Rolling projection

Preseason / current pace / Bayesian update

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

2026-07-18
ERA preseason4.15
ERA current pace4.40
ERA rolling p504.31
Observed weight63%
ERA
3.20 3.72 4.31 4.89 5.42
FIP
3.39 3.71 4.06 4.42 4.74
K%
19.1% 20.3% 21.6% 23.0% 24.2%
BB%
7.1% 7.8% 8.5% 9.3% 10.0%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-18
Pitching · percentile strip
WHIP1.38
38
ERA4.40
40
BB%8.9%
46
K%21.2%
40
xwOBA allowed0.334
29 -20 vs proj
Barrel allowed7.5%
54 +18 vs proj
Fastball velo94.4
49
Hard-hit allowed43.9%
19
Whiff%23.9%
57
Mithrandir+

Stuff+ and arsenal context

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

2026-07-18
Mithrandir Stuff+100
33
Sinker Stuff+103
53
Slider Stuff+96
14
Changeup Stuff+96
15
Cutter Stuff+98
20
Fastball Stuff+101
39
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 0.334 2026-07-07: 0.3302026-07-08: 0.3302026-07-09: 0.3302026-07-10: 0.3302026-07-11: 0.3302026-07-12: 0.3302026-07-13: 0.3342026-07-14: 0.3342026-07-15: 0.3342026-07-16: 0.3342026-07-17: 0.3342026-07-18: 0.334 2026-07-07 2026-07-18 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: 24%24%Called strike: 14%14%First pitch strike: 47%47%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: 37.5%Sinker: 30.6%Cutter: 14.8%4-Seam Fastball: 11.3%Changeup: 5.6%Pitch Out: 0.1% SL38% · 83 mphprimary pitch SL 38%SI 31%FC 15%FF 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, 43″ drop, 83.3 mphSL83 mphSinker: 31% usage, 3″ horizontal break, 23″ drop, 94.4 mphSI94 mphCutter: 15% usage, 0″ horizontal break, 26″ drop, 90.4 mphFC90 mph4-Seam Fastball: 11% usage, 5″ horizontal break, 19″ drop, 94.5 mphFF95 mphChangeup: 6% usage, 14″ horizontal break, 29″ drop, 88.7 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 39.0% 397 96 qualified
SI 33.9% 345 103 qualified
FC 10.7% 109 98 limited sample
FB 9.8% 100 101 limited sample
CH 6.5% 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+0.17
K% Δ-0.001

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.3σ gap
wOBA-against (actual)0.343
xwOBA-against (deserved)0.334

Rocker’s wOBA-against sits at 0.343, but the quality of contact underneath says it should be 0.334 — a gap of 0.009, 0.3 standard deviations from the MLB norm over 93 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
Pitching142026-07-11Slider played up through SL/SI tunnel quality
Projection links / recent games

Available detail

2026-04-15 @ ATH2 ER / 6 K4.2 IP
2026-04-04 vs CIN2 ER / 3 K5.0 IP