Mithrandir Metrics
BOS 2026-08-31 Refreshed Aug 31 06:00 AM ET
Section III · Betting · Player detail · 2026-08-31

Masataka Yoshida

BOS · Hitter
IL10 · 7 Negative regression Hitter-Friendly
MatchupBOS vs SEAGeorge Kirby
Sample--career MLB AB
PROPS 1 available PERCENTILES 24 rows LINEUPS confirmed artifact NO PROSE templated rows only
Strikeouts · Palantir calibration review Last 14d ECE 0.061, 14d stable. This flags probability calibration, not a blanket model failure.
Strikeouts · Valinor calibration review Last 14d ECE 0.077, 14d error rising. This flags probability calibration, not a blanket model failure.
Total Bases · Palantir calibration review Last 14d ECE 0.045, 14d error rising. This flags probability calibration, not a blanket model failure.
Pitcher Outs · Palantir calibration review Last 14d ECE 0.077, 14d error rising. This flags probability calibration, not a blanket model failure.
Tonight's props · all markets for this player
Home Run --
Home Run · tracking

No production board publishes this player-market cell today.

Total Bases 0.5
P 61.7
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 74.9% Market 75.9% Gap +14.2pp
BetMGM -315 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%2.5%
17
Exit velocity88.6
59
Hard-hit%39.3%
54
xBA0.299
27
xSLG0.425
22
xwOBA0.318
66
BB%9.2%
58
Bat speed70.3
60
K%11.4%
97
Defense · percentile strip
Arm Runs0.7 · LF
Small sample
Outs Above Avg-1.2 · LF
15 Regression applied
Range Runs-2.4 · LF
Small sample
Baserunning · percentile strip
Sprint Speed26.1 · DH
19
SB Success Rate100.0% · DH
Small sample
Mithrandir+ · percentile strip
Avoids Bad ChasesST 69.5%
Small sample
Avoids Bad TakesHPT 29.2%
Small sample
Correct Decisions64.4%
Small sample
Resists Breaking - horizontalwOBA 0.316 · small sample
small sample
Resists Breaking - verticalwOBA 0.267 · thin sample
thin sample
Resists ChangeupwOBA 0.302
Small sample
Resists Cutters + splitterswOBA 0.337 · thin sample
thin sample
Resists FastballwOBA 0.342
Small sample
Resists SinkerwOBA 0.340
Small sample
SEAGER+ Plate Discipline101
Small sample

Context

projection · regression · matchup
Projected range--
RegressionNegative · -0.040
Opposing pitcherGeorge Kirby
EnvironmentHitter-Friendly
Lane calibration receipts
Lane Health 2026-08-31
Palantir 17748 props Brier 0.118 ECE 0.008 14d stable
Fangorn 17748 props Brier 0.118 ECE 0.009 14d stable
Valinor 12111 props Brier 0.112 ECE 0.005 14d stable
Palantir 1556 props Brier 0.248 ECE 0.005 14d stable
Fangorn 53 props Brier 0.257 ECE 0.119 sample building
Valinor 1052 props Brier 0.248 ECE 0.017 14d error rising
Palantir 8442 props Brier 0.238 ECE 0.048 14d error rising
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 663 props Brier 0.164 ECE 0.032 14d stable
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 870 props Brier 0.257 ECE 0.062 14d error rising
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)