Mithrandir Metrics
Player Milwaukee Brewers Refreshed Sep 29 06:00 AM ET
Player profile / Milwaukee Brewers

Robert Gasser

P · Bats/Throws L/L · 6' 0", 197 lb · Age 27

Cards
21
Modules
1
Live Δ
yes
Club Milwaukee Brewers Position P Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024202.5755028.0161.04
2025023.182205.251.59
2026553.8721200109.11031.19
3 Seasons773.5928270143.01241.17
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.

2026-09-29
61
Pitching
percentile
Pitching9 metrics
53
Arsenal6 metrics
64
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-29
ERA preseason3.39
ERA current pace3.87
ERA rolling p503.71
Observed weight67%
ERA
1.89 2.75 3.71 4.67 5.53
FIP
3.11 3.51 3.96 4.40 4.81
K%
17.7% 19.1% 20.7% 22.2% 23.6%
BB%
5.3% 6.0% 6.8% 7.6% 8.3%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-29
Pitching · percentile strip
WHIP1.17
77
ERA3.87
56
BB%7.2%
75
K%22.6%
53
xwOBA allowed0.317
44
Barrel allowed7.9%
42
Fastball velo92.8
24
Hard-hit allowed34.8%
77
Whiff%20.4%
30 -30 vs proj
Mithrandir+

Stuff+ and arsenal context

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

2026-09-29
Mithrandir Stuff+104
69
Changeup Stuff+107
88
Cutter Stuff+103
64
Fastball Stuff+99
25
Sinker Stuff+102
51
Slider Stuff+107
86
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 Gasser, Robert · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.317 2026-09-18: 0.3152026-09-19: 0.3152026-09-20: 0.3152026-09-21: 0.3222026-09-22: 0.3222026-09-23: 0.3222026-09-24: 0.3222026-09-25: 0.3222026-09-26: 0.3172026-09-27: 0.3172026-09-28: 0.3172026-09-29: 0.317 2026-09-18 2026-09-29 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 25%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 Gasser, Robert · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 52%52%Whiff: 20%20%Called strike: 17%17%First pitch strike: 54%54%Hard hit allowed: 35%35% 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 Gasser, Robert · 2026 arsenal snapshot Sweeper: 25.2%Sinker: 22.9%4-Seam Fastball: 22.5%Cutter: 18.5%Changeup: 10.4%Slider: 0.5% ST25% · 80 mphprimary pitch ST 25%SI 23%FF 22%FC 18%CH 10%SL 1% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Gasser, Robert · 2026 arsenal snapshot 12″24″36″48″ Sweeper: 25% usage, 5″ horizontal break, 38″ drop, 80.5 mphST80 mphSinker: 23% usage, 3″ horizontal break, 25″ drop, 92.7 mphSI93 mph4-Seam Fastball: 22% usage, 4″ horizontal break, 17″ drop, 92.9 mphFF93 mphCutter: 18% usage, 0″ horizontal break, 28″ drop, 88.5 mphFC89 mphChangeup: 10% usage, 16″ horizontal break, 35″ drop, 88.2 mphCH88 mphSlider: 1% usage, 1″ horizontal break, 38″ drop, 83.9 mphSL84 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 24.2% 189 107 limited sample
SI 21.1% 165 102 limited sample
FB 20.7% 162 99 limited sample
FC 20.6% 161 103 limited sample
CH 13.3% 104 107 limited sample
Method note

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

Reference layer

Current snapshot

Age27
Height6' 0"
Weight197 lb
Debut2024-05-10
Live layer

Delta / regression

ERA Δ-0.07
K% Δ+0.020

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.4σ gap
wOBA-against (actual)0.327
xwOBA-against (deserved)0.317

Gasser’s wOBA-against sits at 0.327, but the quality of contact underneath says it should be 0.317 — a gap of 0.009, 0.4 standard deviations from the MLB norm over 115 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
Pitching212026-09-25Four-Seam Fastball played up through ST/CH tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202620.5% K | 3.94 ERAProjection
2026-03-21 vs SD0 ER / 7 K6.0 IP
2026-03-11 @ CIN4 ER / 4 K2.2 IP