Mithrandir Metrics
Pitcher projection 2026 Refreshed Sep 26 06:00 AM ET
Pitcher projection / MIL · 2026

Romero, JoJo

Run-prevention profile built on workable command

Primary
22.4% K%
Range
17.4% to 30.2%
Live Δ
yes
Team MIL Archetype Volatile contact Age 30 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.

2026-09-26
57
Pitching
percentile
Pitching9 metrics
49
Arsenal5 metrics
50
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-26
ERA preseason3.63
ERA current pace3.66
ERA rolling p503.64
Observed weight50%
ERA
2.17 2.87 3.64 4.42 5.11
FIP
1.97 2.79 3.69 4.59 5.41
K%
18.9% 20.7% 22.6% 24.5% 26.3%
BB%
5.7% 6.7% 7.9% 9.1% 10.1%
Current percentile strip

Actual percentile with projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.24
65
ERA3.66
64
BB%7.5%
70 +17 vs proj
K%22.6%
54
xwOBA allowed0.329
31 -23 vs proj
Barrel allowed7.5%
50
Fastball velo93.7
37
Hard-hit allowed39.8%
41
Whiff%20.1%
27 -46 vs proj
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; Arsenal Decomposition remains descriptive support under Stuff+.

2026-09-26
Mithrandir Stuff+105
81
Sinker Stuff+102
49
Slider Stuff+113
99
Changeup Stuff+91
6
Fastball Stuff+95
14
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 45%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
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 Romero, JoJo · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.329 2026-09-12: 0.3362026-09-13: 0.3362026-09-14: 0.3312026-09-18: 0.3362026-09-19: 0.3362026-09-20: 0.3362026-09-21: 0.3312026-09-22: 0.3312026-09-23: 0.3312026-09-24: 0.3312026-09-25: 0.3312026-09-26: 0.329 2026-09-12 2026-09-26 xwOBA allowed MITHRANDIR · CHARTS
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 Romero, JoJo · Aggregate zone metrics; not pitch-by-pitch locations Edge: 39%39%Zone: 47%47%Whiff: 20%20%Called strike: 21%21%First pitch strike: 51%51%Hard hit allowed: 40%40% 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.

2026
Mithrandir Metrics PITCH ARSENAL DONUT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Romero, JoJo · 2026 arsenal snapshot Sinker: 45.3%Sweeper: 36.8%Changeup: 16.3%4-Seam Fastball: 1.6% SI45% · 94 mphprimary pitch SI 45%ST 37%CH 16%FF 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Romero, JoJo · 2026 arsenal snapshot 12″24″36″48″ Sinker: 45% usage, 5″ horizontal break, 30″ drop, 93.7 mphSI94 mphSweeper: 37% usage, 4″ horizontal break, 40″ drop, 82.9 mphST83 mphChangeup: 16% usage, 12″ horizontal break, 37″ drop, 87.3 mphCH87 mph4-Seam Fastball: 2% usage, 3″ horizontal break, 18″ drop, 94.4 mphFF94 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 44.0% 275 102 qualified
SL 37.8% 236 113 qualified
CH 16.5% 103 91 limited sample
FB 1.8% 11 95 limited sample
Method note

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

Model read

Projection notes

1
templated note
Plays better against lefties right now (0.249 vs 0.298 xwOBA allowed split).
pitcher
2
templated note
Volume stays relief-shaped even when the bat-miss traits are strong.
pitcher
3
templated note
Home park slightly inflates the home-run risk band.
pitcher
4
templated note
Primary mix entering the season: Sweeper 37%, Sinker 32%, Changeup 22%.
pitcher
Live context

Current-season signal

ERA Δ+0.06
K% Δ+0.002
Sample56.3 IP

positive regression

Projection table

Point projection and range

MetricPointRangeHalf-width
Innings38.2----
Batters Faced161----
K%22.4%17.4% to 30.2%+/- 6.4%
BB%8.6%5.2% to 13.0%+/- 3.9%
Whiff%25.7%21.0% to 31.3%+/- 5.1%
HR/91.180.27 to 1.72+/- 0.72
xwOBA Against0.3090.263 to 0.356+/- 0.047
Barrel% Allowed7.6%3.9% to 12.0%+/- 4.0%
ERA3.600.87 to 5.03+/- 2.08
FIP3.682.33 to 7.20+/- 2.43
WHIP1.2160.940 to 1.543+/- 0.302
Platoon / Shape
vs LHH

310 career BF

xwOBA0.249
K%24.4%
BB%7.5%
Barrel4.3%
vs RHH

550 career BF

xwOBA0.298
K%20.6%
BB%8.5%
Barrel8.6%