MLB · Monday, July 20, 2026 · 9:41 PM
Best available price on each side is highlighted. Prices move; always confirm at the book.
| Book | Cincinnati Reds | Seattle Mariners |
|---|---|---|
| BetMGM | +120 | -145 |
| BetRivers | +120 | -141 |
| DraftKings | +119 | -144 |
| ESPN BET | +125 | -145 |
| Fanatics | +120 | -145 |
| FanDuel | +124 | -146 |
| Hard Rock Bet | +125 | -145 |
| Caesars | +118 | -140 |
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 right now.
| Venue | Cincinnati Reds | Seattle Mariners |
|---|---|---|
| Books consensus fair, de-vigged | 43.4% | 56.6% |
| Best book price incl. vig | 44.4% | 58.3% |
| Kalshi contract price | 42.5% | 57.5% |
| Polymarket contract price | 42.5% | 57.5% |
| Markets average | 42.5% | 57.5% |
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.