Seattle Mariners at Colorado Rockies
All Seattle Mariners predictions · All Colorado Rockies predictions
MLB · Friday, September 18, 2026 · 8:11 PM · Final: 5-4
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 | Colorado Rockies |
|---|---|---|
| BetMGM | -190 | +154 |
| BetRivers | -180 | +150 |
| DraftKings | -192 | +158 |
| ESPN BET | -190 | +160 |
| Fanatics | -190 | +155 |
| FanDuel | -186 | +156 |
| Hard Rock Bet | -190 | +160 |
| Caesars | -190 | +156 |
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 | Rockies |
|---|---|---|
| BetMGM | −1.5 -120 | +1.5 +100 |
| BetRivers | −1.5 -118 | +1.5 -104 |
| DraftKings | −1.5 -120 | +1.5 +100 |
| ESPN BET | −1.5 -125 | +1.5 +105 |
| Fanatics | −1.5 -120 | +1.5 +100 |
| FanDuel | −1.5 -125 | +1.5 +104 |
| Hard Rock Bet | −1.5 -125 | +1.5 +105 |
| Caesars | −1.5 -122 | +1.5 +104 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 10.5 -115 | 10.5 -105 |
| BetRivers | 10.5 -115 | 10.5 -106 |
| DraftKings | 10.5 -114 | 10.5 -105 |
| ESPN BET | 10.5 -115 | 10.5 -105 |
| Fanatics | 10.5 -115 | 10.5 -105 |
| FanDuel | 10.5 -115 | 10.5 -105 |
| Hard Rock Bet | 10.5 -115 | 10.5 -105 |
| Caesars | 10.5 -113 | 10.5 -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 | Seattle Mariners | Colorado Rockies |
|---|---|---|
| Books consensus fair, de-vigged | 62.6% | 37.4% |
| Best book price incl. vig | 64.3% | 38.5% |
| Kalshi contract price | 63.5% | 36.5% |
| Polymarket contract price | 63.5% | 36.5% |
| Markets average | 63.5% | 36.5% |
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.