Mithrandir Metrics
KC 2026-08-09 Refreshed Sep 1 06:00 AM ET
Section III · Betting · Player detail · 2026-08-09

Michael Massey

KC · Hitter
IN · 6 Negative regression Hitter-Friendly
MatchupKC vs CHCMatthew Boyd
Sample--career MLB AB
PROPS 2 available PERCENTILES 16 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 13.1
F 13.2
V 12.2
Model 21.9% Market 11.9% Gap +9.5pp
DraftKings 710 tracking Open board
Total Bases 0.5
P 58.6
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 70.3% Market 71.4% Gap +12.9pp
BetMGM -250 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%4.7%
47
Exit velocity88.6
56
Hard-hit%40.6%
58
xBA0.290
19
xSLG0.481
41
xwOBA0.294
35
BB%5.0%
15
Bat speed69.9
54
K%16.6%
83
Defense · percentile strip
Arm Runs-0.1 · 2B
19
Arm Strength85.2 · 2B
34
Outs Above Avg7.0 · 2B
95
Range Runs5.7 · 2B
92
Baserunning · percentile strip
Base Running Runs-1.0 · 2B
21
Sprint Speed26.9 · 2B
36
SB Success Rate100.0% · 2B
Small sample

Context

projection · regression · matchup
Projected range--
RegressionNegative · -0.017
Opposing pitcherMatthew Boyd
EnvironmentHitter-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)