Mithrandir Metrics
NYM 2026-08-17 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-08-17

Marcus Semien

NYM · Hitter · bats R · age 36
IN · 7 Negative regression Pitcher-Friendly
MatchupNYM vs SDWalker Buehler
Sample6738.0career MLB AB
PROPS 3 available PERCENTILES 26 rows LINEUPS confirmed artifact 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 11.6
F 12.4
V 14.0
Model 17.7% Market 13.2% Gap +4.0pp
FanDuel 630 tracking Open board
Total Bases 0.5
P 61.9
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 74.7% Market 75.6% Gap +13.7pp
BetMGM -310 tracking Open board
Hits 1.5
P 22.3
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 22.3% Market -- Gap +1.5pp
FanDuel 320 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%5.7%
62 +19 vs proj
Exit velocity86.8
35
Hard-hit%38.0%
47
xBA0.325
57
xSLG0.528
59
xwOBA0.308
53
BB%7.6%
39 -16 vs proj
Bat speed66.4
14
K%21.4%
55 -26 vs proj
Defense · percentile strip
Arm Runs-0.2 · 2B
16
Arm Strength85.3 · 2B
35
Outs Above Avg-5.0 · 2B
6
Range Runs-3.8 · 2B
17
Baserunning · percentile strip
Base Running Runs-0.3 · 2B
37
SB Success Rate66.7% · 2B
20
Sprint Speed28.1 · 2B
69
Mithrandir+ · percentile strip
Avoids Bad ChasesST 66.2%
54
Avoids Bad TakesHPT 24.4%
59
Correct Decisions68.6%
75
SEAGER+ Plate Discipline102
58
Resists Breaking - horizontalwOBA 0.229 · small sample
small sample
Resists Breaking - verticalwOBA 0.284 · thin sample
thin sample
Resists ChangeupwOBA 0.306
Small sample
Resists Cutters + splitterswOBA 0.330 · thin sample
thin sample
Resists FastballwOBA 0.337
Small sample
Resists SinkerwOBA 0.356
Small sample

Context

projection · regression · matchup
Projected range0.272 to 0.366
RegressionNegative · -0.001
Opposing pitcherWalker Buehler
EnvironmentPitcher-Friendly
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)