Mithrandir Metrics
Player Arizona Diamondbacks Refreshed Jul 19 06:00 AM ET
Player profile / Arizona Diamondbacks

Jonathan Loáisiga

P · Bats/Throws R/R · 5' 11", 195 lb · Age 31

Cards
0
Modules
0
Live Δ
yes
Club Arizona Diamondbacks Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024100.003004.032.00
2025014.25300129.2251.48
2026222.13410138.0271.03
9 Seasons21143.35234119287.12591.23
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.

2026-07-19
79
Pitching
percentile
Pitching9 metrics
79
Arsenal5 metrics
77
Rolling projection

Preseason / current pace / Bayesian update

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

2026-07-19
ERA preseason3.23
ERA current pace2.17
ERA rolling p502.81
Observed weight40%
ERA
1.15 1.94 2.81 3.68 4.46
FIP
2.69 3.20 3.76 4.32 4.82
K%
13.7% 16.0% 18.7% 21.3% 23.7%
BB%
3.4% 4.5% 5.7% 7.0% 8.1%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-07-19
Pitching · percentile strip
WHIP1.02
90
ERA2.17
94
BB%5.1%
96
K%19.0%
27
xwOBA allowed0.271
89 +29 vs proj
Barrel allowed5.0%
85
Fastball velo97.5
92
Hard-hit allowed32.8%
87
Whiff%22.8%
48
Mithrandir+

Stuff+ and arsenal context

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

2026-07-19
Changeup Stuff+102
46
Curveball Stuff+107
98
Fastball Stuff+102
49
Mithrandir Stuff+108
91
Sinker Stuff+111
98
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 Loáisiga, Jonathan · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 0.271 2026-07-08: 0.2802026-07-09: 0.2772026-07-10: 0.2772026-07-11: 0.2772026-07-12: 0.2722026-07-13: 0.2722026-07-14: 0.2712026-07-15: 0.2712026-07-16: 0.2712026-07-17: 0.2712026-07-18: 0.2712026-07-19: 0.271 2026-07-08 2026-07-19 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.

5Pitches 2026Season 31%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 Loáisiga, Jonathan · Aggregate zone metrics; not pitch-by-pitch locations Edge: 40%40%Zone: 47%47%Whiff: 23%23%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 Loáisiga, Jonathan · 2026 arsenal snapshot Changeup: 30.6%Sinker: 30.5%Curveball: 17.9%4-Seam Fastball: 17.8%Cutter: 3.3% CH31% · 91 mphprimary pitch CH 31%SI 30%CU 18%FF 18%FC 3% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Loáisiga, Jonathan · 2026 arsenal snapshot 9″18″27″36″ Changeup: 31% usage, 13″ horizontal break, 28″ drop, 90.8 mphCH91 mphSinker: 30% usage, 9″ horizontal break, 21″ drop, 97.6 mphSI98 mphCurveball: 18% usage, 2″ horizontal break, 33″ drop, 89.1 mphCU89 mph4-Seam Fastball: 18% usage, 6″ horizontal break, 15″ drop, 97.4 mphFF97 mphCutter: 3% usage, 1″ horizontal break, 21″ drop, 95.6 mphFC96 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 32.6% 120 111 limited sample
CH 27.4% 101 102 limited sample
FB 19.8% 73 102 limited sample
CB 19.0% 70 107 limited sample
FC 1.1% 4 118 limited sample
Method note

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

Reference layer

Current snapshot

Age31
Height5' 11"
Weight195 lb
Debut2018-06-15
Live layer

Delta / regression

ERA Δ-1.61
K% Δ-0.020

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.6σ gap
wOBA-against (actual)0.293
xwOBA-against (deserved)0.271

Loáisiga’s wOBA-against sits at 0.293, but the quality of contact underneath says it should be 0.271 — a gap of 0.023, 0.6 standard deviations from the MLB norm over 40 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
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202621.0% K | 3.78 ERAProjection
2026-04-17 vs TOR1 ER / 1 K1.0 IP
2026-04-13 @ BAL2 ER / 0 K0.2 IP
2026-04-12 @ PHI0 ER / 0 K1.0 IP
2026-04-07 @ NYM1 ER / 1 K1.0 IP
2026-04-05 vs ATL1 ER / 1 K1.0 IP