Tampa Bay Rays at Seattle Mariners
All Tampa Bay Rays predictions · All Seattle Mariners predictions
MLB · Saturday, August 8, 2026 · 9:51 PM · Final: 3-2
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 | Tampa Bay Rays | Seattle Mariners |
|---|---|---|
| BetMGM | +118 | -140 |
| BetRivers | +115 | -130 |
| DraftKings | +125 | -134 |
| ESPN BET | +120 | -140 |
| Fanatics | +110 | -130 |
| FanDuel | +126 | -136 |
| Hard Rock Bet | +120 | -130 |
| Caesars | +126 | -136 |
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 | Rays | Mariners |
|---|---|---|
| BetMGM | +1.5 -200 | −1.5 +165 |
| BetRivers | +1.5 -225 | −1.5 +170 |
| DraftKings | +1.5 -194 | −1.5 +159 |
| ESPN BET | +1.5 -200 | −1.5 +165 |
| Fanatics | +1.5 -190 | −1.5 +155 |
| FanDuel | +1.5 -200 | −1.5 +164 |
| Hard Rock Bet | +1.5 -210 | −1.5 +150 |
| Caesars | +1.5 -180 | −1.5 +152 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 7 -115 | 7 -105 |
| BetRivers | 7 -114 | 7 -105 |
| DraftKings | 7 -117 | 7 -103 |
| ESPN BET | 7.5 +115 | 7.5 -135 |
| Fanatics | 7 -115 | 7 -105 |
| FanDuel | 7 -110 | 7 -110 |
| Hard Rock Bet | 7.5 +120 | 7.5 -130 |
| Caesars | 7 -125 | 7 +105 |
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 | Tampa Bay Rays | Seattle Mariners |
|---|---|---|
| Books consensus fair, de-vigged | 43.9% | 56.1% |
| Best book price incl. vig | 44.2% | 56.5% |
| Kalshi contract price | 45.5% | 54.5% |
| Polymarket contract price | 45.5% | 54.5% |
| Markets average | 45.5% | 54.5% |
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.