Mithrandir Metrics
NYM 2026-05-31 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-05-31

Marcus Semien

NYM · Hitter · bats R · age 36
IN · 5 Positive regression Neutral
MatchupNYM vs MIAJanson Junk
Sample6575.0career MLB AB
PROPS 3 available PERCENTILES 25 rows LINEUPS tracking; not posted NO PROSE templated rows only
Strikeouts · Palantir calibration review Last 14d ECE 0.065, 14d stable. This flags probability calibration, not a blanket model failure.
Strikeouts · Valinor calibration review Last 14d ECE 0.079, 14d error rising. This flags probability calibration, not a blanket model failure.
Total Bases · Palantir calibration review Last 14d ECE 0.047, 14d error rising. This flags probability calibration, not a blanket model failure.
Pitcher Outs · Palantir calibration review Last 14d ECE 0.064, 14d stable. This flags probability calibration, not a blanket model failure.
Tonight's props · all markets for this player
Home Run 0.5
P 14.1
F 11.4
V 11.4
Model 17.6% Market 13.2% Gap +3.9pp
FanDuel 630 tracking Open board
Total Bases 0.5
P 34.8
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 34.8% Market 56.6% Gap +2.4pp
FanDuel 380 tracking Open board
Hits 0.5
P 2.0
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 2.0% Market -- Gap +1.7pp
FanDuel 17500 tracking Open board
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%6.5%
72 +31 vs proj
Exit velocity86.2
25
Hard-hit%37.5%
39
xBA0.323
49
xSLG0.524
55
xwOBA0.309
49
BB%6.5%
25 -28 vs proj
Bat speed66.2
14
K%19.6%
62 -17 vs proj
Defense · percentile strip
Arm Strength84.5 · 2B
40
Outs Above Avg-3.0 · 2B
9
Range Runs-2.6 · 2B
14
Baserunning · percentile strip
Base Running Runs-0.3 · 2B
32
Sprint Speed28.2 · 2B
75
SB Success Rate50.0% · 2B
Small sample
Mithrandir+ · percentile strip
Avoids Bad ChasesST 65.5%
49
Avoids Bad TakesHPT 24.4%
58
Correct Decisions68.6%
73
SEAGER+ Plate Discipline101
52
Resists Breaking - horizontalwOBA 0.221 · small sample
small sample
Resists Breaking - verticalwOBA 0.280 · thin sample
thin sample
Resists ChangeupwOBA 0.298
Small sample
Resists Cutters + splitterswOBA 0.337 · thin sample
thin sample
Resists FastballwOBA 0.316
Small sample
Resists SinkerwOBA 0.367
Small sample

Context

projection · regression · matchup
Projected range0.272 to 0.366
RegressionPositive · 0.010
Opposing pitcherJanson Junk
EnvironmentNeutral
Lane calibration receipts
Lane Health 2026-09-01
Palantir 17901 props Brier 0.117 ECE 0.008 14d stable
Fangorn 17901 props Brier 0.118 ECE 0.009 14d stable
Valinor 12243 props Brier 0.112 ECE 0.005 14d stable
Palantir 1577 props Brier 0.247 ECE 0.006 14d stable
Fangorn 53 props Brier 0.257 ECE 0.119 sample building
Valinor 1073 props Brier 0.247 ECE 0.016 14d error rising
Palantir 8544 props Brier 0.238 ECE 0.047 14d error rising
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 673 props Brier 0.163 ECE 0.031 14d stable
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 891 props Brier 0.256 ECE 0.060 14d stable
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)