Chicago Cubs at Seattle Mariners
All Chicago Cubs predictions · All Seattle Mariners predictions
MLB · Saturday, August 22, 2026 · 7:16 PM · Final: 4-5
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 | Chicago Cubs | Seattle Mariners |
|---|---|---|
| BetMGM | -102 | -118 |
| BetRivers | +102 | -117 |
| DraftKings | +105 | -113 |
| ESPN BET | +102 | -115 |
| Fanatics | +100 | -120 |
| FanDuel | +106 | -114 |
| Hard Rock Bet | +105 | -115 |
| Caesars | +103 | -113 |
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 | Chicago Cubs | Seattle Mariners |
|---|---|---|
| Books consensus fair, de-vigged | 47.9% | 52.1% |
| Best book price incl. vig | 48.5% | 53.1% |
| 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.