Mithrandir Metrics
Player Boston Red Sox Refreshed Sep 27 06:00 AM ET
Player profile / Boston Red Sox

Andruw Monasterio

SS · Bats/Throws R/R · 5' 11", 195 lb · Age 29

Cards
27
Modules
2
Live Δ
yes
Club Boston Red Sox Position SS Roster Current MLB team Status Healthy / active roster
Traditional line

Season by season

3D Swing Sim Projections
PARHHRSBAVGOBPSLGOPS
2024142142616.208.303.272.575
2025135193442.270.319.437.756
2026347357364.233.295.371.666
4 Seasons9391062061419.243.311.358.669
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.

2026-09-27
31
Offense
percentile
Offense9 metrics
35
Defense4 metrics
33
Speed3 metrics
28
Plate skills12 metrics
51
Rolling projection

Preseason / current pace / Bayesian update

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

2026-09-27
xwOBA preseason0.308
xwOBA current pace0.289
xwOBA rolling p500.296
Observed weight62%
xwOBA
0.269 0.282 0.296 0.310 0.323
wOBA
0.278 0.293 0.309 0.326 0.340
ISO
0.104 0.117 0.131 0.145 0.158
K%
17.7% 18.9% 20.4% 21.8% 23.1%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-27
Hitting · percentile strip
Barrel%4.5%
44
Exit velocity86.4
35
Hard-hit%30.9%
19 -15 vs proj
xBA0.294
23
xSLG0.451
31
xwOBA0.289
34 -16 vs proj
BB%7.3%
35
Bat speed67.6
27
K%19.3%
71 +28 vs proj
Defense · percentile strip
Arm Runs0.4 · SS
85
Arm Strength84.6 · SS
26
Outs Above Avg-2.0 · SS
19
Range Runs-11.0 · SS
1
Baserunning · percentile strip
Base Running Runs-0.4 · SS
35
SB Success Rate50.0% · SS
4
Sprint Speed27.2 · SS
44
Mithrandir+

Stuff+ and arsenal context

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

2026-09-27
Avoids Bad ChasesST 70.2% · rebadged research
75
Avoids Bad TakesHPT 27.5% · rebadged research
27
Correct Decisions69.4% · rebadged research
81
SEAGER+ Plate Discipline103
62
Mithrandir Stuff+45
1
Resists Breaking - horizontalwOBA 0.258 · borderline
95
Resists Breaking - verticalwOBA 0.290 · insufficient sample
25
Resists ChangeupwOBA 0.276 · validated thin sample
60
Resists Cutters + splitterswOBA 0.335 · insufficient sample
25
Resists FastballwOBA 0.319 · validated
84
Resists SinkerwOBA 0.349 · validated
71
Slider Stuff+47
0
Rolling form chart

xwOBA 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 Monasterio, Andruw · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.302 0.289 2026-09-13: 0.2942026-09-14: 0.2932026-09-18: 0.2922026-09-19: 0.2922026-09-20: 0.2922026-09-21: 0.2922026-09-22: 0.2922026-09-23: 0.2912026-09-24: 0.2912026-09-25: 0.2912026-09-26: 0.2892026-09-27: 0.289 2026-09-13 2026-09-27 xwOBA 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.

2Pitches 2026Season 96%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 Swing Zone Profile Monasterio, Andruw · Aggregate zone metrics; not pitch-by-pitch locations Zone: 51%51%Chase: 27%27%Whiff: 17%17%Zone contact: 90%90%Contact: 83%83%Hard hit: 31%31% 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 Monasterio, Andruw · 2026 arsenal snapshot Slider: 96.4%Curveball: 3.6% SL96% · 49 mphprimary pitch SL 96%CU 4% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Monasterio, Andruw · 2026 arsenal snapshot 6″12″18″24″ Slider: 96% usage, 0″ horizontal break, 8″ drop, 49.5 mphSL49 mphCurveball: 4% usage, 0″ horizontal break, 13″ drop, 40.4 mphCU40 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 96.4% 27 47 limited sample
CB 3.6% 1 63 limited sample
Method note

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

Reference layer

Current snapshot

Age29
Height5' 11"
Weight195 lb
Debut2023-05-28
Live layer

Delta / regression

xwOBA Δ-0.014
wOBA Δ+0.007

negative regression

Regression watch

Running hot. Expect some cooling.

-0.7σ gap
wOBA (actual)0.309
xwOBA (deserved)0.289

Monasterio’s wOBA sits at 0.309, but the quality of contact underneath says it should be 0.289 — a gap of 0.021, -0.7 standard deviations from the MLB norm over 358 PA. The results have outrun the underlying process; as the sample grows, expect the numbers to drift back toward the deserved level.

Comp Engine · 2026 profile shape

Closest profiles

Full constellation →
PlayerSimilarityAgrees onOpen
Keaschall, Luke MIN · R 0.79 Hard-hit rateIsolated power Player · Projection
Young, Jacob WSH · R 0.74 Avg exit velocityChase rate Player · Projection
Loftin, Nick KC · R 0.71 Whiff rateSweet-spot rate Player · Projection
Grissom, Vaughn LAA · R 0.65 In-zone contactSprint speed Player · Projection

Profile-shape similarity, not results: six weighted feature groups standardized within this season's qualified hitters.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Hitting32026-07-29Disciplined swing decisions drove the score
Fielding242026-09-255 chances | 0 difficult plays | Run Exp -0.309
Projection links / recent games

Available detail

Hitter Projections 20260.302 xwOBA | 6 HRProjection
2026-08-15 @ PIT0 HR | 2 RBI / 5 Ch | 0 E1-4 | 2B, 2 RBI, R
2026-04-15 @ MIN0 HR | 1 RBI / 5 Ch | 0 E3-5 | 2B, RBI, R
2026-04-14 @ MIN0 HR | 0 RBI / 3 Ch | 0 E0-2 | 2 K
2026-04-13 @ MIN0 HR | 1 RBI / 3 Ch | 0 E1-2 | K, RBI
2026-04-08 vs MIL0 HR | 0 RBI / 1 Ch | 0 E0-2 | 3 BB, R