Mariners vs. Rays prediction: Why Tampa Bay is favored to win Sunday's MLB matchup [7/12/2026]
Get Seattle Mariners vs Tampa Bay Rays predictions for MLB Sunday.
The Tampa Bay Rays and Seattle Mariners are scheduled to meet in MLB action at Tropicana Field on Sunday, starting at 1:40 PM ET.
The Rays will have Ian Seymour (6-1, 4.11 ERA) as their starting pitcher, while the Mariners are going with Emerson Hancock (6-4, 3.22 ERA).
Based on updated simulations, Dimers' proven MLB model gives the Rays a slight edge with a 52.0% win probability over the Mariners.
This article offers a closer look at Sunday's Mariners vs. Rays matchup, including best bets and picks.
Mariners vs. Rays prediction: Who will win and cover?
Our leading predictive model currently gives the Rays a 52.0% chance of defeating the Mariners.
According to our model, the Mariners (+1.5) have a 64.7% chance of covering the run line, while the 7.5-run over/under has a 54.5% chance of going over,.
Mariners vs. Rays odds [7/12/2026]
We have researched the best MLB odds in America for this game, which are listed here:
| Bet Type | Mariners | Rays |
|---|---|---|
| Run Line | +1.5 (-178) | -1.5 (+170) |
| Moneyline | +127 | -125 |
| Total | o7.5 (-108) | u7.5 (+104) |
All odds are correct at the time of publication and are subject to change.
Mariners vs. Rays picks and best bet
After matching our probabilities against the best current odds, we can reveal our picks for each of the major markets. Plus, find our best bet for the game below:
| Bet Type | Pick | Bet Now |
|---|---|---|
| Run Line | Mariners +1.5 | polymarket-178 |
| Moneyline | Mariners | polymarket+127 |
| Total | Over 7.5 | novig-108 |
According to our MLB best bets, the top play to make on this game is Mariners to win.
These picks are based on our probabilities matched against the implied probabilities from the sportsbook odds.
Mariners vs. Rays game-day updates and essential details
Sunday's MLB game between the Rays and Mariners at Tropicana Field is scheduled to begin at 1:40 PM ET.
- Who: Seattle Mariners vs. Tampa Bay Rays
- Date: Sunday, July 12, 2026
- Time: 1:40 PM ET/10:40AM PT
- Venue: Tropicana Field
Conclusion
We predict the Rays, with a 52.0% win probability, will likely beat the Mariners in Sunday's MLB matchup.
Additional tools and information for betting safely can be found in our Responsible Gambling hub.
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Jason Bevilacqua, an expert in MLB, NHL, NBA, MLS, and NFL, delivers game previews, best bets, and props. Since 2020, as Head of Social and Community at Dimers, he has contributed insightful articles utilizing data-driven models and simulations.
