Mithrandir Metrics
MIA 2026-05-19 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-05-19

Heriberto Hernández

MIA · Hitter · bats R · age 27
IN · 6 Pitcher-Friendly
MatchupMIA vs ATLMartín Pérez
Sample333.0career MLB AB
PROPS 1 available PERCENTILES 18 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 8.0
F 11.1
V 11.7
Model 15.1% Market 12.0% Gap +2.7pp
DraftKings 705 tracking Open board
Total Bases --
Total Bases · tracking

No production board publishes this player-market cell today.

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%4.1%
34 -24 vs proj
Exit velocity90.7
77
Hard-hit%46.2%
75 +16 vs proj
xBA0.321
44
xSLG0.517
50
xwOBA0.341
73 +15 vs proj
BB%14.3%
90 +45 vs proj
Bat speed72.2
81
K%18.4%
70 +37 vs proj
Defense · percentile strip
Outs Above Avg-2.0 · LF
7
Arm Runs-0.2 · LF
Small sample
Range Runs-2.2 · LF
Small sample
Baserunning · percentile strip
Sprint Speed28.4 · LF
83
SB Success Rate100.0% · LF
Small sample
Mithrandir+ · percentile strip
Avoids Bad ChasesST 74.1%
82
Avoids Bad TakesHPT 21.0%
93
Correct Decisions73.4%
94
SEAGER+ Plate Discipline110
96

Context

projection · regression · matchup
Projected range0.266 to 0.365
RegressionNo current flag
Opposing pitcherMartín Pérez
EnvironmentPitcher-Friendly
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)