Seattle Mariners at Colorado Rockies
All Seattle Mariners predictions · All Colorado Rockies predictions
MLB · Sunday, September 20, 2026 · 3:11 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 | Seattle Mariners | Colorado Rockies |
|---|---|---|
| BetMGM | -165 | +135 |
| BetRivers | -167 | +140 |
| DraftKings | -163 | +135 |
| ESPN BET | -155 | +135 |
| Fanatics | -165 | +135 |
| FanDuel | -164 | +138 |
| Hard Rock Bet | -165 | +135 |
| Caesars | -170 | +141 |
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 -110 | +1.5 -110 |
| BetRivers | −1.5 -113 | +1.5 -108 |
| DraftKings | −1.5 -108 | +1.5 -111 |
| ESPN BET | −1.5 -105 | +1.5 -115 |
| Fanatics | −1.5 -110 | +1.5 -110 |
| FanDuel | −1.5 -108 | +1.5 -111 |
| Hard Rock Bet | −1.5 -110 | +1.5 -110 |
| Caesars | −1.5 -106 | +1.5 -112 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 11 -102 | 11 -118 |
| BetRivers | 11 -121 | 11 -118 |
| DraftKings | 11 -108 | 11 -112 |
| ESPN BET | 10.5 -125 | 10.5 +105 |
| Fanatics | 11 -110 | 11 -110 |
| FanDuel | 10.5 -128 | 10.5 +104 |
| Hard Rock Bet | 10.5 -125 | 10.5 +105 |
| Caesars | 10.5 -125 | 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 | 59.4% | 40.6% |
| Best book price incl. vig | 60.8% | 41.5% |
| Kalshi contract price | 59.7% | 40.3% |
| Polymarket contract price | 59.5% | 40.5% |
| Markets average | 59.6% | 40.4% |
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.