Mithrandir Metrics
Player Texas Rangers Refreshed Sep 27 06:00 AM ET
Player profile / Texas Rangers

Kumar Rocker

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

Cards
25
Modules
1
Live Δ
yes
Club Texas Rangers Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024023.8633011.2141.54
2025455.741414064.1561.46
20266114.3830270148.01381.41
3 Seasons10184.7447440224.02081.43
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.

2026-09-27
40
Pitching
percentile
Pitching9 metrics
44
Arsenal6 metrics
23
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-27
ERA preseason4.15
ERA current pace4.38
ERA rolling p504.32
Observed weight73%
ERA
3.13 3.70 4.32 4.94 5.50
FIP
3.43 3.78 4.16 4.54 4.88
K%
19.9% 20.8% 21.9% 23.0% 23.9%
BB%
7.8% 8.4% 9.1% 9.8% 10.4%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Pitching · percentile strip
WHIP1.42
33
ERA4.38
41
BB%9.5%
44 -17 vs proj
K%21.7%
46
xwOBA allowed0.324
35
Barrel allowed7.3%
51 +20 vs proj
Fastball velo94.4
51
Hard-hit allowed40.5%
34
Whiff%24.7%
65 +17 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-09-27
Cutter Stuff+97
14
Fastball Stuff+99
29
Mithrandir Stuff+100
28
Sinker Stuff+101
37
Slider Stuff+97
16
Changeup Stuff+96
15
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 0.313 0.324 2026-09-13: 0.3292026-09-14: 0.3292026-09-18: 0.3292026-09-19: 0.3282026-09-20: 0.3282026-09-21: 0.3282026-09-22: 0.3282026-09-23: 0.3282026-09-24: 0.3282026-09-25: 0.3282026-09-26: 0.3242026-09-27: 0.324 2026-09-13 2026-09-27 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.

7Pitches 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: 36%36%Zone: 46%46%Whiff: 25%25%Called strike: 14%14%First pitch strike: 48%48%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 Rocker, Kumar · 2026 arsenal snapshot Slider: 37.6%Sinker: 29.4%4-Seam Fastball: 14.7%Cutter: 14.2%Changeup: 3.3%Split-Finger: 0.8% SL38% · 83 mphprimary pitch SL 38%SI 29%FF 15%FC 14%CH 3%FS 1% 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, 83.2 mphSL83 mphSinker: 29% usage, 2″ horizontal break, 23″ drop, 94.4 mphSI94 mph4-Seam Fastball: 15% usage, 6″ horizontal break, 19″ drop, 94.6 mphFF95 mphCutter: 14% usage, 0″ horizontal break, 26″ drop, 90.3 mphFC90 mphChangeup: 3% usage, 14″ horizontal break, 29″ drop, 88.8 mphCH89 mphSplit-Finger: 1% usage, 13″ horizontal break, 31″ drop, 88.0 mphFS88 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% 671 97 qualified
SI 32.8% 580 101 qualified
FB 13.9% 245 99 qualified
FC 11.6% 204 97 qualified
CH 3.7% 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+0.16
K% Δ+0.004

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.8σ gap
wOBA-against (actual)0.343
xwOBA-against (deserved)0.324

Rocker’s wOBA-against sits at 0.343, but the quality of contact underneath says it should be 0.324 — a gap of 0.019, 0.8 standard deviations from the MLB norm over 150 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
Pitching252026-09-24Slider played up through SL/FF tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202621.3% K | 4.24 ERAProjection
2026-04-15 @ ATH2 ER / 6 K4.2 IP
2026-04-04 vs CIN2 ER / 3 K5.0 IP