Seattle Mariners at Boston Red Sox
All Seattle Mariners predictions · All Boston Red Sox predictions
MLB · Tuesday, September 1, 2026 · 6:46 PM · Final: 9-6
Closing moneyline by book
The last price each book posted before first pitch — the prices this call could actually have been bet at. Best on each side is highlighted. In-game odds are deliberately excluded: once the game starts, the price tracks the score, not the matchup.
| Book | Seattle Mariners | Boston Red Sox |
|---|---|---|
| BetMGM | +100 | -120 |
| BetRivers | +102 | -120 |
| DraftKings | -101 | -120 |
| ESPN BET | +107 | -120 |
| Fanatics | +100 | -120 |
| FanDuel | +100 | -118 |
| Hard Rock Bet | +100 | -120 |
| Caesars | +106 | -117 |
Spread & total
Not part of the model's call. Collected from every book and graded in public so the prices can be checked — how spreads and totals have graded so far. The percent is what the price itself implies, vig removed.
| Spread by book | Mariners | Red Sox |
|---|---|---|
| BetMGM | +1.5 -220 | −1.5 +180 |
| BetRivers | −1.5 +180 | +1.5 -240 |
| DraftKings | −1.5 +173 | +1.5 -212 |
| ESPN BET | −1.5 +175 | +1.5 -225 |
| Fanatics | −1.5 +175 | +1.5 -220 |
| FanDuel | −1.5 +164 | +1.5 -200 |
| Hard Rock Bet | +1.5 -210 | −1.5 +175 |
| Caesars | +1.5 -205 | −1.5 +170 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 7 -125 | 7 +105 |
| BetRivers | 7 -117 | 7 -103 |
| DraftKings | 7 -123 | 7 +102 |
| ESPN BET | 7.5 +100 | 7.5 -120 |
| Fanatics | 7 -125 | 7 +105 |
| FanDuel | 7.5 +102 | 7.5 -124 |
| Hard Rock Bet | 7.5 +105 | 7.5 -125 |
| Caesars | 7 -120 | 7 +100 |
Prediction markets vs the books
Every venue sells the same thing — a dollar if that side wins — at a different price. Implied cost per venue below; amber = the cheapest way to buy that side at the close.
| Venue | Seattle Mariners | Boston Red Sox |
|---|---|---|
| Books consensus fair, de-vigged | 47.8% | 52.2% |
| Best book price incl. vig | 48.3% | 53.9% |
| Kalshi contract price | 47.5% | 52.5% |
| Polymarket contract price | 47.5% | 52.5% |
| Markets average | 47.5% | 52.5% |
Contract prices exclude exchange trading fees (Kalshi ~1–2¢ midrange), which narrow small gaps. A venue meaningfully below the books consensus is either a bargain or an early opinion — the graded record decides which.