St. Louis Cardinals at Arizona Diamondbacks
MLB · Saturday, July 18, 2026 · 4:11 PM · Final: 3-5
The model's call
Arizona Diamondbacks to win
Model confidence 52.1%
Books consensus 52.1%
Result Arizona Diamondbacks won
model ✓
Identical on purpose: the model applies no adjustment to the books’ de-vigged
consensus until a candidate signal proves itself in shadow audit — none has yet.
Prediction markets below are a comparison, not an input.
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 | St. Louis Cardinals | Arizona Diamondbacks |
|---|---|---|
| ESPN BET | +100 | -120 |
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 | St. Louis Cardinals | Arizona Diamondbacks |
|---|---|---|
| Books consensus fair, de-vigged | 47.9% | 52.1% |
| Best book price incl. vig | 50.0% | 54.5% |
| 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.
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