MLB has 3 matches on Wednesday, September 16. Below is the full slate with bookmaker prices and the probabilities those prices imply once the margin is removed.
Fixtures and odds
| UTC | Match | Home | Away | Implied |
|---|---|---|---|---|
| 00:10 | Houston Astros vs Kansas City Royals | 1.60 | 2.33 | 59.3% / 40.7% |
| 01:38 | Los Angeles Angels vs Seattle Mariners | 2.36 | 1.58 | 40.1% / 59.9% |
| 01:40 | Arizona Diamondbacks vs Miami Marlins | 1.66 | 2.21 | 57.1% / 42.9% |
Odds are decimal, averaged across 10 books (BetOnline.ag, GTbets, Unibet (FR), Betclic (FR), Winamax (DE), Winamax (FR)). "Implied" strips the bookmaker margin so the numbers add up to 100%.
Match by match
Houston Astros vs Kansas City Royals
00:10 UTC · Daikin Park, Houston · Season record: Houston Astros 75-75 / Kansas City Royals 66-84
The market leans Houston Astros at 59.3%. Prices come from 10 books, and they differ by 13.0% on the widest side.
Los Angeles Angels vs Seattle Mariners
01:38 UTC · Angel Stadium, Anaheim · Season record: Los Angeles Angels 56-93 / Seattle Mariners 70-80
The market leans Seattle Mariners at 59.9%. Prices come from 9 books, and they differ by 14.9% on the widest side.
Arizona Diamondbacks vs Miami Marlins
01:40 UTC · Chase Field, Phoenix · Season record: Arizona Diamondbacks 79-71 / Miami Marlins 74-76
The market leans Arizona Diamondbacks at 57.1%. Prices come from 9 books, and they differ by 12.2% on the widest side.
What the market is saying
- Closest on paper — Arizona Diamondbacks vs Miami Marlins: 57.1% vs 42.9%.
- Most one-sided — Los Angeles Angels vs Seattle Mariners: the market gives Seattle Mariners 59.9%.
- Where books disagree most — Los Angeles Angels vs Seattle Mariners: 14.9% between the best and worst price.
- Average bookmaker margin — 5.4% across the slate.
Reading the slate
The Houston Astros are favored at home against Kansas City with the market pricing them at 59.3% to win. This is the closest margin on the slate at just 5.3 points, suggesting bookmakers see the match as genuinely competitive. The book spread of 13.0% indicates reasonable agreement across the ten available sportsbooks, pointing to a fixture where consensus is fairly firm.
Seattle's trip to Los Angeles shapes up as the most one-sided contest of the night, with the Mariners carrying a 59.9% implied win probability. The Angels sit at 40.1%, giving Seattle nearly a 20-point advantage in the market's eyes. However, this match shows the widest book spread at 14.9%, meaning sportsbooks disagree notably more here than on the other two games—a point worth noting when comparing how different operators are pricing this fixture.
Arizona holds 57.1% to beat Miami at home, positioning the Diamondbacks as clear but not overwhelming favorites. The margin of 5.4% keeps this game closer than the Seattle matchup but slightly wider than the Houston game. Across all three fixtures, the book spreads cluster between 12–15%, suggesting consistent levels of disagreement among operators, though none reach the volatility seen in the Los Angeles game.
Prices captured 2026-09-15 00:00 UTC. Odds move.