Mithrandir Metrics
Player Seattle Mariners Refreshed Sep 28 06:00 AM ET
Player profile / Seattle Mariners

Bryce Miller

P · Bats/Throws R/R · 6' 2", 200 lb · Age 28

Cards
20
Modules
1
Live Δ
yes
Club Seattle Mariners Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
20241282.9431310180.11710.98
2025465.681818090.1741.41
20264104.1722210118.21191.16
4 Seasons28314.0496950520.24831.14
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.

2026-09-28
65
Pitching
percentile
Pitching9 metrics
63
Arsenal6 metrics
61
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-28
ERA preseason3.80
ERA current pace4.17
ERA rolling p504.05
Observed weight67%
ERA
3.05 3.52 4.05 4.57 5.04
FIP
3.19 3.72 4.31 4.89 5.42
K%
21.5% 22.7% 24.0% 25.2% 26.4%
BB%
6.4% 7.0% 7.6% 8.3% 8.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-28
Pitching · percentile strip
WHIP1.18
75
ERA4.17
47
BB%7.8%
65
K%24.5%
67 +16 vs proj
xwOBA allowed0.297
71 +31 vs proj
Barrel allowed8.0%
40
Fastball velo95.8
73
Hard-hit allowed32.5%
89
Whiff%21.5%
41
Mithrandir+

Stuff+ and arsenal context

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

2026-09-28
Fastball Stuff+113
99
Mithrandir Stuff+107
93
Slider Stuff+103
62
Curveball Stuff+99
12
Cutter Stuff+106
92
Sinker Stuff+94
10
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 Miller, Bryce · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.297 2026-09-14: 0.2972026-09-18: 0.2972026-09-19: 0.2972026-09-20: 0.2972026-09-21: 0.2952026-09-22: 0.2952026-09-23: 0.2952026-09-24: 0.2952026-09-25: 0.2952026-09-26: 0.2972026-09-27: 0.2972026-09-28: 0.297 2026-09-14 2026-09-28 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.

8Pitches 2026Season 39%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 Miller, Bryce · Aggregate zone metrics; not pitch-by-pitch locations Edge: 38%38%Zone: 49%49%Whiff: 22%22%Called strike: 13%13%First pitch strike: 53%53%Hard hit allowed: 33%33% 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 Miller, Bryce · 2026 arsenal snapshot 4-Seam Fastball: 39.5%Split-Finger: 23.4%Slider: 11.4%Sinker: 8.6%Sweeper: 7.2%Cutter: 5.7% FF39% · 96 mphprimary pitch FF 39%FS 23%SL 11%SI 9%ST 7%FC 6% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Miller, Bryce · 2026 arsenal snapshot 15″30″45″60″ 4-Seam Fastball: 39% usage, 0″ horizontal break, 11″ drop, 96.0 mphFF96 mphSplit-Finger: 23% usage, 3″ horizontal break, 34″ drop, 84.6 mphFS85 mphSlider: 11% usage, 0″ horizontal break, 34″ drop, 87.3 mphSL87 mphSinker: 9% usage, 5″ horizontal break, 16″ drop, 95.3 mphSI95 mphSweeper: 7% usage, 12″ horizontal break, 46″ drop, 83.7 mphST84 mphCutter: 6% usage, 0″ horizontal break, 23″ drop, 91.2 mphFC91 mphKnuckle Curve: 4% usage, 3″ horizontal break, 52″ drop, 82.9 mphKC83 mphPitch Out: 0% usage, 7″ horizontal break, 11″ drop, 92.0 mphPO92 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 47.5% 317 113 qualified
SL 30.0% 200 103 qualified
SI 13.0% 87 94 limited sample
CB 5.8% 39 99 limited sample
FC 3.6% 24 106 limited sample
Method note

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

Reference layer

Current snapshot

Age28
Height6' 2"
Weight200 lb
Debut2023-05-02
Live layer

Delta / regression

ERA Δ+0.02
K% Δ+0.023

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.6σ gap
wOBA-against (actual)0.314
xwOBA-against (deserved)0.297

Miller’s wOBA-against sits at 0.314, but the quality of contact underneath says it should be 0.297 — a gap of 0.017, 0.6 standard deviations from the MLB norm over 117 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
Pitching202026-09-25Four-Seam Fastball played up through SL/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202622.2% K | 4.15 ERAProjection