Mithrandir Metrics
BOS 2026-08-21 Refreshed Sep 1 06:00 AM ET
Section III · Betting · Player detail · 2026-08-21

Jarren Duran

BOS · Hitter · bats L · age 30
IN · 7 Negative regression Neutral
MatchupBOS vs SFLogan Webb
Sample--career MLB AB
PROPS 3 available PERCENTILES 17 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 11.3
F 11.7
V 10.6
Model 15.6% Market 11.8% Gap +3.4pp
DraftKings 715 tracking Open board
Total Bases 0.5
P 68.4
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 82.7% Market 83.7% Gap +15.4pp
BetMGM -515 tracking Open board
Hits 0.5
P 31.6
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 31.6% Market -- Gap +7.2pp
FanDuel 310 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%6.2%
68
Exit velocity88.9
60
Hard-hit%41.0%
60
xBA0.336
69
xSLG0.550
65
xwOBA0.292
35
BB%7.3%
35
Bat speed72.9
89
K%28.3%
21
Defense · percentile strip
Arm Runs-0.3 · LF
46
Arm Strength92.0 · LF
40
Outs Above Avg4.0 · LF
95
Range Runs3.3 · LF
80
Baserunning · percentile strip
Base Running Runs2.6 · LF
90
Bolts10.0 · LF
65
SB Success Rate86.7% · LF
70
Sprint Speed29.0 · LF
90

Context

projection · regression · matchup
Projected range0.303 to 0.374
RegressionNegative · -0.003
Opposing pitcherLogan Webb
EnvironmentNeutral
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)