Mithrandir Metrics
NYM 2026-08-18 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-08-18

Mark Vientos

NYM · Hitter · bats R · age 27
IL10 · 6 Positive regression Neutral
MatchupNYM vs SDRobbie Ray
Sample--career MLB AB
PROPS 2 available PERCENTILES 17 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 11.7
F 12.3
V 11.3
Model 16.7% Market 16.4% Gap -0.2pp
DraftKings 490 tracking Open board
Total Bases 0.5
P 60.3
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 72.6% 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%7.4%
83
Exit velocity89.9
75
Hard-hit%43.9%
75
xBA0.315
45
xSLG0.602
80
xwOBA0.310
55
BB%4.8%
14
Bat speed71.8
78
K%23.8%
44
Defense · percentile strip
Arm Strength85.4 · 1B
37
Outs Above Avg-9.0 · 1B
2
Range Runs-6.3 · 1B
8
Baserunning · percentile strip
Sprint Speed25.7 · 1B
12
Mithrandir+ · percentile strip
Avoids Bad ChasesST 59.8%
23
Avoids Bad TakesHPT 20.7%
87
Correct Decisions66.4%
54
SEAGER+ Plate Discipline100
44

Context

projection · regression · matchup
Projected range0.300 to 0.377
RegressionPositive · 0.017
Opposing pitcherRobbie Ray
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)