Mithrandir Metrics
Player Sugar Land Space Cowboys Refreshed Sep 26 06:00 AM ET
Player profile / Sugar Land Space Cowboys

Kai-Wei Teng

P · Bats/Throws R/R · 6' 4", 241 lb · Age 27

Cards
7
Modules
1
Live Δ
yes
Club Sugar Land Space Cowboys Position P Roster Current MLB team Status Out / inactive
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024009.8240011.072.09
2025246.3787029.2391.55
2026574.763010073.2731.38
3 Seasons7115.6742170114.11191.50
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
37
Pitching
percentile
Pitching9 metrics
42
Arsenal6 metrics
54
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 preseason5.28
ERA current pace4.76
ERA rolling p504.97
Observed weight58%
ERA
2.86 3.86 4.97 6.09 7.09
FIP
3.10 3.62 4.20 4.78 5.30
K%
19.8% 21.2% 22.7% 24.3% 25.7%
BB%
7.6% 8.6% 9.6% 10.7% 11.6%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-09-26
Pitching · percentile strip
WHIP1.37
44
ERA4.76
32
BB%9.8%
41
K%21.9%
48 -20 vs proj
xwOBA allowed0.339
23 -26 vs proj
Barrel allowed7.9%
42 -23 vs proj
Fastball velo93.3
30
Hard-hit allowed39.1%
46
Whiff%25.6%
73
Mithrandir+

Stuff+ and arsenal context

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

2026-09-26
Fastball Stuff+100
34
Mithrandir Stuff+104
70
Slider Stuff+109
95
Changeup Stuff+97
21
Curveball Stuff+102
46
Sinker Stuff+103
60
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 Teng, Kai-Wei · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.339 2026-09-12: 0.3392026-09-13: 0.3392026-09-14: 0.3392026-09-18: 0.3392026-09-19: 0.3392026-09-20: 0.3392026-09-21: 0.3392026-09-22: 0.3392026-09-23: 0.3392026-09-24: 0.3392026-09-25: 0.3392026-09-26: 0.339 2026-09-12 2026-09-26 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 35%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 Teng, Kai-Wei · Aggregate zone metrics; not pitch-by-pitch locations Edge: 37%37%Zone: 48%48%Whiff: 26%26%Called strike: 19%19%First pitch strike: 47%47%Hard hit allowed: 39%39% 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 Teng, Kai-Wei · 2026 arsenal snapshot Sweeper: 35.4%4-Seam Fastball: 27.2%Sinker: 17.0%Changeup: 9.8%Curveball: 9.0%Slider: 1.6% ST35% · 84 mphprimary pitch ST 35%FF 27%SI 17%CH 10%CU 9%SL 2% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Teng, Kai-Wei · 2026 arsenal snapshot 15″30″45″60″ Sweeper: 35% usage, 2″ horizontal break, 38″ drop, 84.2 mphST84 mph4-Seam Fastball: 27% usage, 3″ horizontal break, 18″ drop, 93.3 mphFF93 mphSinker: 17% usage, 7″ horizontal break, 26″ drop, 93.2 mphSI93 mphChangeup: 10% usage, 13″ horizontal break, 32″ drop, 87.0 mphCH87 mphCurveball: 9% usage, 10″ horizontal break, 49″ drop, 82.4 mphCU82 mphSlider: 2% usage, 0″ horizontal break, 35″ drop, 85.5 mphSL85 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SL 36.3% 310 109 qualified
FB 25.3% 216 100 qualified
SI 18.1% 154 103 limited sample
CB 10.8% 92 102 limited sample
CH 9.5% 81 97 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' 4"
Weight241 lb
Debut2024-03-31
Live layer

Delta / regression

ERA Δ-0.13
K% Δ-0.025

positive regression

Regression watch

Unlucky so far. Better days ahead.

0.3σ gap
wOBA-against (actual)0.346
xwOBA-against (deserved)0.339

Teng’s wOBA-against sits at 0.346, but the quality of contact underneath says it should be 0.339 — a gap of 0.007, 0.3 standard deviations from the MLB norm over 75 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
Pitching72026-06-27Sweeper played up through ST/FF tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202624.4% K | 4.89 ERAProjection
2026-04-14 vs COL1 ER / 2 K1.1 IP
2026-04-11 @ SEA0 ER / 2 K0.2 IP
2026-04-08 @ COL0 ER / 1 K1.1 IP
2026-04-07 @ COL1 ER / 0 K0.2 IP
2026-04-04 @ ATH0 ER / 3 K2.1 IP