San Francisco Giants at Boston Red Sox
All San Francisco Giants predictions · All Boston Red Sox predictions
MLB · Friday, August 21, 2026 · 7:11 PM · Final: 4-6
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 | San Francisco Giants | Boston Red Sox |
|---|---|---|
| BetMGM | +145 | -180 |
| BetRivers | +155 | -177 |
| DraftKings | +163 | -176 |
| ESPN BET | +155 | -185 |
| Fanatics | +155 | -190 |
| FanDuel | +158 | -172 |
| Hard Rock Bet | +165 | -175 |
| Caesars | +162 | -177 |
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 | San Francisco Giants | Boston Red Sox |
|---|---|---|
| Books consensus fair, de-vigged | 37.5% | 62.5% |
| Best book price incl. vig | 37.7% | 63.2% |
| Kalshi contract price | 37.5% | 62.5% |
| Polymarket contract price | 37.5% | 62.5% |
| Markets average | 37.5% | 62.5% |
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.