Arizona Diamondbacks at Kansas City Royals
All Arizona Diamondbacks predictions · All Kansas City Royals predictions
MLB · Wednesday, September 9, 2026 · 8:31 PM · Final: 2-5
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 | Arizona Diamondbacks | Kansas City Royals |
|---|---|---|
| BetMGM | -120 | +100 |
| BetRivers | -117 | +104 |
| DraftKings | -120 | +100 |
| ESPN BET | -125 | +105 |
| Fanatics | -120 | +100 |
| FanDuel | -120 | +102 |
| Hard Rock Bet | -120 | +100 |
| Caesars | -120 | +102 |
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 | Diamondbacks | Royals |
|---|---|---|
| BetMGM | −1.5 +135 | +1.5 -165 |
| BetRivers | −1.5 +133 | +1.5 -162 |
| DraftKings | −1.5 +137 | +1.5 -166 |
| ESPN BET | −1.5 +140 | +1.5 -165 |
| Fanatics | −1.5 +130 | +1.5 -160 |
| FanDuel | −1.5 +138 | +1.5 -170 |
| Hard Rock Bet | −1.5 +135 | +1.5 -165 |
| Caesars | −1.5 +140 | +1.5 -170 |
| Total by book | Over | Under |
|---|---|---|
| BetMGM | 8.5 -120 | 8.5 +100 |
| BetRivers | 9 +100 | 9 -120 |
| DraftKings | 8.5 -120 | 8.5 +100 |
| ESPN BET | 8.5 -120 | 8.5 +100 |
| Fanatics | 8.5 -120 | 8.5 +100 |
| FanDuel | 8.5 -120 | 8.5 -102 |
| Hard Rock Bet | 8.5 -120 | 8.5 +100 |
| Caesars | 8.5 -120 | 8.5 +100 |
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 | Arizona Diamondbacks | Kansas City Royals |
|---|---|---|
| Books consensus fair, de-vigged | 52.3% | 47.7% |
| Best book price incl. vig | 53.9% | 48.8% |
| Kalshi contract price | 52.2% | 47.8% |
| Polymarket contract price | 52.5% | 47.5% |
| Markets average | 52.4% | 47.6% |
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.