Seattle Mariners vs Boston Red Sox: MLB Prediction, Pick & Odds — Sep 2, 2026

SEA

64-74

PregameWed, 4:10 PM EDTMLB.TV

BOS

75-63

Verdict

Pass · no edge tonight.

The model doesn't see daylight against the posted line on this game. We don't surface negative-EV picks; check the drill-down for sub-model context.

Why this matchup

2 signals · model + market

Park factor

104 total idx

Fenway Park run environment

Park factor boosts run scoring, so contact quality matters more tonight here.

Recent form

6-4

BOS -1.2 vs SEA -2.7 margin

BOS brings the hotter last-ten margin into this matchup tonight with balance.

Fenway Park · Boston, Massachusetts

Drill down

Sub-model tables · ensemble breakdown · last meeting · book shop · player props

Pregame · scouting report

The matchup, end-to-end.

Probable starters, projected lineups, head-to-head this season, our model edge against the market — every angle on one surface.

Away starter

Bryce Miller

SP · #50

4-8

W-L

4.12

ERA

1.09

WHIP

94.0

Last 3 starts

vsCHCL(4-8)4.1 IP6 ER5 K

@MILL(4-7)4.2 IP5 ER3 K

@NYY-6.0 IP5 ER5 K

Home starter

Patrick Sandoval

SP · #43

1-3

W-L

4.20

ERA

1.71

WHIP

45.0

Last 3 starts

@NYYL(1-3)5.1 IP1 ER7 K

vsSF-5.2 IP2 ER6 K

@PITL(1-2)4.0 IP7 ER6 K

Vegas line

Lines post once a sportsbook releases them.

Model edge

Win prob36% / 64%

LeanHome · 14pp

ConfidenceEdge

Head to head

SeriesBOS leads series 1-0

TypeCurrent Series

Scouting report · pre-game

BOS vs SEA.

BOS is 6-4 recently; SEA is 4-6.

63.6%

model · BOS win prob

Recent form

BOS6–4-1.2
SEA4–6-2.7

Situational

BOS2d rest
SEA2d rest
+0.0d differential

Rest is even. BOS has 0 straight road games; SEA has 4.

Model angle

Weather and park add about 0.3 runs from the total environment.

▲Weather + park+0.3pp

Players to watch

Payton TolleBOS
6.9strikeouts · ±2.7
Payton Tolle · 6.9 K · last-10 7.3 vs season 6.4.
Logan GilbertSEA
6.0strikeouts · ±1.8
Logan Gilbert · 6 K · last-10 5.9 vs season 6.1.
Bryan WooSEA
5.5strikeouts · ±1.2
Bryan Woo · 5.5 K · last-10 5.4 vs season 5.7.

Head-to-head · 1-0 · last 1

BOS is 1-0 in the recent head-to-head sample.

2026-08-31SEA @ BOS8–9

Aggregated from r107 anatomy · r109 CLV history · r112 calibration · r118 line moves · r124 player projections · refreshes every 5 minutes

Model ensemble · how the prediction is built

3 sub-models, blended.

Each sub-model uses a different rating substrate. Bayesian model averaging weights them by rolling Brier score so the ensemble inherits each model's strengths. Disagreement flags games where the sub-models don't see eye-to-eye — lower confidence, wider band.

63.7%

ensemble · BOS favored

Elo Static
66.9%
P(BOS win)
34%
weight
Elo Pitching
66.8%
P(BOS win)
33%
weight
Bullpen Park
67.8%
P(BOS win)
34%
weight

Disagreement

0.45 pp

weighted σ across sub-models

Confidence

97% · high

maps from disagreement

Substrate count

3 / 3 active

ones with full inputs tonight

Weights recalibrated nightly on a 90-day rolling window with strict point-in-time correctness — no model gets credit for a game it hasn't seen. Headline % is Platt-scaled per league; sub-model rows show raw BMA inputs.

Player projections

BOS vs SEA.

Per-player stat projections built from a recency-weighted blend of the last ten games, season average, and matchup context. Confidence reflects sample size and stability — the top of each list is who to watch.

128

projections · 112 high confidence

Strikeouts

Payton TolleBOS
6.9± 2.7high
Logan GilbertSEA
6.0± 1.8high
Bryan WooSEA
5.5± 1.2high

Hits

Ceddanne RafaelaBOS
1.1± 1.0high
Nick SogardBOS
1.1± 0.9high
Randy ArozarenaSEA
1.1± 1.4high

Total bases

Cal RaleighSEA
2.5± 3.6high
Randy ArozarenaSEA
2.1± 3.4high
Mickey GasperBOS
2.0± 2.5high

RBIs

Cal RaleighSEA
0.8± 1.4high
Mickey GasperBOS
0.7± 1.0high
Randy ArozarenaSEA
0.7± 1.4high

Earned runs

Bryce MillerSEA
3.2± 2.1medium
Bryan WooSEA
2.9± 2.2high
George KirbySEA
2.8± 2.6high

Projections recompute every 30 minutes · prop lines plug in once sportsbook ingest lands

Matchup · 2026

Team rate stats vs league

MLB Stats API

SEA

league avg

BOS

.682

OPS

.718

▶

.728

.308

OBP

.318

▶

.323

3.90

Runs / G

4.50

▶

4.48

4.18

Team ERA

4.16

▶

3.60

1.25

WHIP

1.30

▶

1.23

8.6

K / 9

8.5

8.6

The One modelEdge

Wed, Sep 2

SEA

Mariners

75-90

vs63.6%BOS

BOS★

Red Sox

85-77

SEA 36.4%win prob63.6% BOS

BOS 1564 · SEA 1466Box score→

Team pages

Seattle MarinersBoston Red Sox

Elsewhere in the MLB

Data via ESPN · MLB Stats API · Baseball Savant

Seattle Mariners at Boston Red Sox

The matchup, end-to-end.

BOS vs SEA.

3 sub-models, blended.

BOS vs SEA.

Team rate stats vs league

BOS vs SEA.

3 sub-models, blended.