Mithrandir Metrics
SEA 2026-08-21 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-08-21

Rob Refsnyder

SEA · Hitter
OUT · 2 Positive regression Neutral
MatchupSEA vs CHCMatthew Boyd
Sample--career MLB AB
PROPS 2 available PERCENTILES 13 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 12.3
F 12.6
V 12.0
Model 16.4% Market 12.2% Gap +3.8pp
DraftKings 695 tracking Open board
Total Bases 0.5
P 60.3
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 72.5% Market 73.7% Gap +13.4pp
BetMGM -280 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%5.5%
59
Exit velocity85.8
26
Hard-hit%34.5%
32
xBA0.252
5
xSLG0.470
37
xwOBA0.255
11
BB%6.8%
32
Bat speed69.5
48
K%29.5%
16
Defense · percentile strip
Outs Above Avg-1.0 · RF
22
Arm Runs-0.3 · RF
Small sample
Range Runs-0.5 · RF
Small sample
Baserunning · percentile strip
Sprint Speed27.0 · DH
39

Context

projection · regression · matchup
Projected range--
RegressionPositive · 0.010
Opposing pitcherMatthew Boyd
EnvironmentNeutral
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)