Mithrandir Metrics
NYM 2026-05-21 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-05-21

Marcus Semien

NYM · Hitter · bats R · age 36
IN · 5 Negative regression Neutral
MatchupNYM vs WSHCade Cavalli
Sample6543.0career MLB AB
PROPS 2 available PERCENTILES 19 rows LINEUPS tracking; not posted 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 9.8
F 11.1
V 15.8
Model 16.2% Market 13.2% Gap +2.5pp
FanDuel 630 tracking Open board
Total Bases 1.5
P 58.1
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 58.1% Market 72.1% Gap -3.7pp
FanDuel 130 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%6.2%
63 +23 vs proj
Exit velocity86.1
23
Hard-hit%36.0%
29
xBA0.321
44
xSLG0.504
47
xwOBA0.302
41
BB%7.1%
30 -20 vs proj
Bat speed66.0
13
K%19.9%
59 -19 vs proj
Defense · percentile strip
Arm Strength84.5 · 2B
43
Outs Above Avg-2.0 · 2B
14
Range Runs-0.7 · 2B
36
Baserunning · percentile strip
Base Running Runs-0.3 · 2B
33
Sprint Speed28.1 · 2B
75
SB Success Rate50.0% · 2B
Small sample
Mithrandir+ · percentile strip
Avoids Bad ChasesST 71.8%
72
Avoids Bad TakesHPT 19.2%
96
Correct Decisions74.0%
97
SEAGER+ Plate Discipline110
96

Context

projection · regression · matchup
Projected range0.272 to 0.366
RegressionNegative · -0.015
Opposing pitcherCade Cavalli
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)