Mithrandir Metrics
ATL 2026-09-27 Refreshed Sep 27 06:00 AM ET
Section III · Betting · Player detail · 2026-09-27

Ronald Acuña Jr.

ATL · Hitter · bats R · age 29
IN · 1 Positive regression Pitcher-Friendly
MatchupATL vs MIAJanson Junk
Sample--career MLB AB
PROPS 2 available PERCENTILES 17 rows LINEUPS confirmed artifact NO PROSE templated rows only
Total Bases · Palantir calibration review Last 14d ECE 0.068, 14d error rising. This flags probability calibration, not a blanket model failure.
Hits · Palantir calibration review Last 14d ECE 0.060, 14d stable. This flags probability calibration, not a blanket model failure.
Tonight's props · all markets for this player
Home Run 0.5
P 13.0
F 13.8
V 15.4
Model 16.5% Market 19.4% Gap -2.9pp
BetMGM 415 tracking Open board
Total Bases 0.5
P 66.1
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 81.8% Market 82.8% Gap +16.7pp
BetMGM -480 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%8.4%
90
Exit velocity89.7
74
Hard-hit%43.9%
77 -17 vs proj
xBA0.349
82
xSLG0.663
91
xwOBA0.366
96
BB%11.5%
85
Bat speed73.2
90
K%21.9%
56
Defense · percentile strip
Arm Runs2.0 · RF
89
Arm Strength100.1 · RF
92
Outs Above Avg-7.0 · RF
2
Range Runs-6.6 · RF
8
Baserunning · percentile strip
Base Running Runs0.2 · RF
46
Bolts1.0 · RF
11
SB Success Rate79.2% · RF
46
Sprint Speed27.2 · RF
44

Context

projection · regression · matchup
Projected range0.340 to 0.424
RegressionPositive · 0.000
Opposing pitcherJanson Junk
EnvironmentPitcher-Friendly
Lane calibration receipts
Lane Health 2026-09-27
Palantir 21810 props Brier 0.118 ECE 0.004 14d stable
Fangorn 21810 props Brier 0.118 ECE 0.005 14d error falling
Valinor 16122 props Brier 0.114 ECE 0.002 14d stable
Palantir 1972 props Brier 0.248 ECE 0.011 14d error falling
Fangorn 53 props Brier 0.257 ECE 0.119 sample building
Valinor 1468 props Brier 0.248 ECE 0.009 14d stable
Palantir 10537 props Brier 0.239 ECE 0.041 14d error rising
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 850 props Brier 0.166 ECE 0.036 14d stable
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 1097 props Brier 0.255 ECE 0.052 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)