Rays vs. Mariners prediction: Seattle favored to win Sunday's MLB matchup [8/9/2026]
Get Tampa Bay Rays vs Seattle Mariners predictions for MLB Sunday.
The Seattle Mariners will square off with the Tampa Bay Rays, in what is expected to be a tight MLB game, at T-Mobile Park on Sunday, beginning at 4:10 PM ET.
Emerson Hancock (6-6, 3.33 ERA) will start for the Mariners, while the Rays have opted for Ian Seymour (8-3, 4.27 ERA).
Dimers' advanced MLB model gives the Mariners a slight edge with a 53.3% win probability over the Rays.
This article offers an expanded analysis of Sunday's Rays vs. Mariners matchup, including best bets and picks.
Rays vs. Mariners prediction: Who will win and cover?
Our independent predictive model currently gives the Mariners a 53.3% chance of beating the Rays.
According to our model, the Rays (+1.5) have a 62.3% chance of covering the run line, while the 7.5-run over/under has a 52.8% chance of going over,.
Rays vs. Mariners odds [8/9/2026]
We have researched the best MLB odds in America for this game, which are listed here:
- Run Line: Mariners -1.5 @ +176 via FanDuel
- Moneyline: Mariners @ -104 via Polymarket
- Total: Over 7.5 @ -104 via Novig
All odds are correct at the time of publication and are subject to change.
Rays vs. Mariners picks and best bet
After matching our probabilities against the best available odds, we can reveal our picks for each of the major markets in this matchup. Plus, find our best bet for the game below:
- Run line: Mariners -1.5 @ +176 via DraftKings
- Moneyline: Mariners @ -104 via Polymarket
- Total: Over 7.5 @ -104 via Novig 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.
Rays vs. Mariners game-day updates and essential details
Sunday's MLB game between the Mariners and Rays at T-Mobile Park is scheduled to start at 4:10 PM ET.
- Who: Tampa Bay Rays vs. Seattle Mariners
- Date: Sunday, August 9, 2026
- Time: 4:10 PM ET/1:10PM PT
- Venue: T-Mobile Park
Conclusion
We predict the Mariners, with a 53.3% win probability, will likely beat the Rays 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.
