Mithrandir Metrics
SF 2026-08-20 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-08-20

Luis Arraez

SF · Hitter · bats L · age 29
IN · 1 Negative regression Pitcher-Friendly
MatchupSF vs CLEGavin Williams
Sample3730.0career MLB AB
PROPS 2 available PERCENTILES 26 rows LINEUPS confirmed artifact NO PROSE templated rows only
Strikeouts · Palantir calibration review Last 14d ECE 0.053, 14d stable. This flags probability calibration, not a blanket model failure.
Strikeouts · Valinor calibration review Last 14d ECE 0.068, 14d stable. This flags probability calibration, not a blanket model failure.
Total Bases · Palantir calibration review Last 14d ECE 0.053, 14d error rising. This flags probability calibration, not a blanket model failure.
Tonight's props · all markets for this player
Home Run 0.5
P 7.1
F 11.3
V 11.4
Model 7.2% Market 7.7% Gap -0.8pp
DraftKings 1150 tracking Open board
Total Bases 0.5
P 66.5
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 80.4% Market 81.3% Gap +14.8pp
BetMGM -435 tracking Open board
Hits --
Hits · tracking

No production board publishes this player-market cell today.

RBI --
RBI · no production board

No production board publishes this player-market cell today.

Underlying skill · actual percentile with projection tick

Percentile strip

100th = best in MLB
Hitting · percentile strip
Barrel%0.8%
3
Exit velocity86.0
28
Hard-hit%19.7%
2
xBA0.300
28
xSLG0.392
10
xwOBA0.303
47 -31 vs proj
BB%5.1%
15
Bat speed61.6
1
K%4.3%
100
Defense · percentile strip
Arm Runs0.3 · 2B
84
Arm Strength88.4 · 2B
58
Outs Above Avg11.0 · 2B
98
Range Runs8.3 · 2B
96
Baserunning · percentile strip
Base Running Runs1.4 · 2B
77
SB Success Rate100.0% · 2B
93
Sprint Speed26.7 · 2B
31
Mithrandir+ · percentile strip
Avoids Bad ChasesST 64.3%
45
Avoids Bad TakesHPT 28.4%
22
Correct Decisions66.6%
55
Resists FastballwOBA 0.339
45
SEAGER+ Plate Discipline97
30
Resists Breaking - horizontalwOBA 0.285 · small sample
small sample
Resists Breaking - verticalwOBA 0.316 · thin sample
thin sample
Resists ChangeupwOBA 0.265
Small sample
Resists Cutters + splitterswOBA 0.347 · thin sample
thin sample
Resists SinkerwOBA 0.385
Small sample

Context

projection · regression · matchup
Projected range0.303 to 0.378
RegressionNegative · -0.050
Opposing pitcherGavin Williams
EnvironmentPitcher-Friendly
Lane calibration receipts
Lane Health 2026-09-02
Palantir 18081 props Brier 0.118 ECE 0.008 14d stable
Fangorn 18081 props Brier 0.118 ECE 0.009 14d stable
Valinor 12423 props Brier 0.112 ECE 0.004 14d stable
Palantir 1591 props Brier 0.247 ECE 0.006 14d stable
Fangorn 53 props Brier 0.257 ECE 0.119 sample building
Valinor 1087 props Brier 0.248 ECE 0.016 14d stable
Palantir 8613 props Brier 0.238 ECE 0.047 14d error rising
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 683 props Brier 0.163 ECE 0.031 14d stable
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 900 props Brier 0.256 ECE 0.059 14d error falling
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir tracking in progress (0 logged)
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)