Tampa Bay Rays at Seattle Mariners
All Tampa Bay Rays predictions · All Seattle Mariners predictions
MLB · Friday, August 7, 2026 · 9:46 PM · Final: 2-1
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 | -102 | -118 |
| BetRivers | +100 | -114 |
| DraftKings | +104 | -112 |
| ESPN BET | +100 | -120 |
| Fanatics | +100 | -120 |
| FanDuel | +102 | -112 |
| Hard Rock Bet | +100 | -110 |
| Caesars | +105 | -115 |
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 -225 | −1.5 +170 |
| BetRivers | −1.5 +175 | +1.5 -235 |
| DraftKings | +1.5 -219 | −1.5 +178 |
| ESPN BET | −1.5 +175 | +1.5 -225 |
| Fanatics | −1.5 +175 | +1.5 -220 |
| FanDuel | −1.5 +188 | +1.5 -230 |
| Hard Rock Bet | −1.5 +185 | +1.5 -195 |
| Caesars | +1.5 -220 | −1.5 +180 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 6.5 -118 | 6.5 -102 |
| BetRivers | 7 +104 | 7 -124 |
| DraftKings | 6.5 -120 | 6.5 +100 |
| ESPN BET | 6.5 -125 | 6.5 +105 |
| Fanatics | 6.5 -120 | 6.5 +100 |
| FanDuel | 6.5 -122 | 6.5 +100 |
| Hard Rock Bet | 6.5 -115 | 6.5 +105 |
| Caesars | 6.5 -120 | 6.5 +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 | Tampa Bay Rays | Seattle Mariners |
|---|---|---|
| Books consensus fair, de-vigged | 48.2% | 51.8% |
| Best book price incl. vig | 48.8% | 52.4% |
| Kalshi contract price | 48.0% | 52.0% |
| Polymarket contract price | 47.5% | 52.5% |
| Markets average | 47.7% | 52.2% |
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.