Mithrandir Metrics
Player Boston Red Sox Refreshed Jun 16 06:00 AM ET
Player profile / Boston Red Sox

Aroldis Chapman

P profile with live context, projection links, and Mithrandir card history when available.

Cards
0
Modules
0
Live Δ
yes
Club Boston Red Sox Position P Roster Active Status Healthy / active roster
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.

2026-06-16
77
Pitching
percentile
Pitching9 metrics
67
Arsenal4 metrics
67
Rolling projection

Preseason / current pace / Bayesian update

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

2026-06-16
ERA preseason3.48
ERA current pace0.46
ERA rolling p502.61
Observed weight29%
ERA
1.08 1.81 2.61 3.42 4.14
FIP
1.74 2.24 2.78 3.33 3.82
K%
28.5% 31.3% 34.4% 37.5% 40.3%
BB%
7.2% 8.8% 10.6% 12.5% 14.1%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-16
Pitching · percentile strip
WHIP1.11
76
ERA0.46
100
BB%11.3%
23
K%34.0%
97
xwOBA allowed0.267
89
Barrel allowed11.5%
10 -33 vs proj
Fastball velo97.2
89
Hard-hit allowed42.3%
31
Whiff%31.2%
93
Mithrandir+

Stuff+ and arsenal context

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

2026-06-16
Fastball Stuff+102
48
Mithrandir Stuff+107
89
Sinker Stuff+110
97
Slider Stuff+99
32
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 Chapman, Aroldis · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.267 2026-06-05: 0.2732026-06-06: 0.2742026-06-07: 0.2742026-06-08: 0.2742026-06-09: 0.2742026-06-10: 0.2742026-06-11: 0.2742026-06-12: 0.2742026-06-13: 0.2742026-06-14: 0.2742026-06-15: 0.2672026-06-16: 0.267 2026-06-05 2026-06-16 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.

4Pitches 2026Season 37%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 Chapman, Aroldis · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 49%49%Whiff: 31%31%Called strike: 17%17%First pitch strike: 51%51%Hard hit allowed: 42%42% 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 Chapman, Aroldis · 2026 arsenal snapshot Sinker: 37.3%4-Seam Fastball: 35.1%Slider: 18.0%Split-Finger: 9.7% SI37% · 98 mphprimary pitch SI 37%FF 35%SL 18%FS 10% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Chapman, Aroldis · 2026 arsenal snapshot 9″18″27″36″ Sinker: 37% usage, 4″ horizontal break, 12″ drop, 97.9 mphSI98 mph4-Seam Fastball: 35% usage, 0″ horizontal break, 11″ drop, 96.5 mphFF97 mphSlider: 18% usage, 2″ horizontal break, 33″ drop, 85.3 mphSL85 mphSplit-Finger: 10% usage, 5″ horizontal break, 31″ drop, 89.6 mphFS90 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 42.8% 116 110 limited sample
FB 38.7% 105 102 limited sample
SL 18.5% 50 99 limited sample
Method note

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

Reference layer

Current snapshot

Age38
Height6' 4"
Weight235 lb
Debut2010-08-31
Live layer

Delta / regression

ERA Δ-2.80
K% Δ-0.001
Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202634.2% K | 3.26 ERAProjection
2026-05-20 @ KC0 ER / 1 K1.0 IP
2026-04-20 vs DET0 ER / 1 K0.2 IP
2026-04-17 vs DET0 ER / 1 K1.0 IP
2026-04-14 @ MIN0 ER / 3 K1.0 IP
2026-04-07 vs MIL0 ER / 0 K1.0 IP