Mariners vs Rays Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 9

Odds updated as of 12:11 a.m.

The MLB slate on Sunday includes the Seattle Mariners taking on the Tampa Bay Rays.

All the info you need to make smart wagers on this game at FanDuel Sportsbook can be found below. Check out all of the latest MLB betting lines here.

Mariners vs Rays Game Info

• Seattle Mariners (56-61) vs. Tampa Bay Rays (69-46)
• Date: Sunday, August 9, 2026
• Time: 4:10 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: Mariners.TV and Rays.TV

Mariners vs Rays Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-136) | TB: (+126)
• Spread: SEA: -1.5 (+162) | TB: +1.5 (-196)
• Total: 7 -- Over: (-118) | Under: (-104)

Mariners vs Rays Probable Starting Pitchers

Probable Pitchers: Emerson Hancock (Mariners) - 6-6, 3.33 ERA vs Ian Seymour (Rays) - 8-3, 4.27 ERA

This contest's pitching matchup is set, as the Mariners will send Emerson Hancock (6-6) to the mound, while Ian Seymour (8-3) will take the ball for the Rays. When Hancock starts, his team is 7-14-0 against the spread this season. When Hancock starts a game and his team is the favorite on the moneyline, they have a record of 8-8. The Rays have a 6-1-0 ATS record in Seymour's seven starts with a set spread. The Rays were the underdog on the moneyline for one Seymour start this season -- they won.

Mariners vs Rays Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Rays win (52.9%)

Mariners vs Rays Moneyline

• The Mariners vs Rays moneyline has Seattle as a -136 favorite, while Tampa Bay is a +126 underdog on the road.

Mariners vs Rays Spread

• The Rays are at +1.5 on the runline against the Mariners. The Rays are -196 to cover the spread, and the Mariners are +162.

Mariners vs Rays Over/Under

• The Mariners-Rays game on Aug. 9 has been given an over/under of 7 runs. The over is set at -118 and the under at -104.

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Mariners vs Rays Betting Trends

• The Mariners have been favorites in 97 games this season and have come away with the win 49 times (50.5%) in those contests.
• Seattle has a record of 32-20 in contests when oddsmakers favor them by -136 or more on the moneyline.
• The Mariners' games have gone over the total in 57 of their 116 opportunities.
• The Mariners are 41-75-0 against the spread in their 116 games that had a posted line this season.
• The Rays have won 17 of the 35 games they were the underdog on the moneyline this season (48.6%).
• Tampa Bay has a 4-2 record (winning 66.7% of its games) when playing as a moneyline underdog of +126 or longer.
• The Rays have played in 113 games with a set over/under, and have combined with opponents to go over the total 51 times (51-60-2).
• The Rays have covered 57.5% of their games this season, going 65-48-0 against the spread.

Mariners Player Leaders

• Randy Arozarena leads Seattle in slugging percentage (.451) and total hits (113) this season. He's batting .282 with an on-base percentage of .376.
• He ranks 27th in batting average, 14th in on-base percentage, and 52nd in slugging among all qualified hitters in baseball.
• Julio Rodriguez is batting .260 with 16 doubles, 18 home runs and 35 walks, while slugging .429 with an on-base percentage of .323.
• Among qualifying hitters, his batting average ranks him 64th, his on-base percentage 85th, and his slugging percentage 70th.
• Rodriguez brings a seven-game streak with at least one hit into this one. In his last 10 games he is hitting .316 with three home runs, five walks and six RBIs.
• Cole Young is batting .263 with a .411 slugging percentage and 51 RBI this year.
• Josh Naylor has been key for Seattle with 109 hits, an OBP of .323 plus a slugging percentage of .352.

Rays Player Leaders

• Junior Caminero has accumulated a team-high OBP (.375), while pacing the Rays in hits (123). He's batting .283 and slugging.
• Including all qualified players in the majors, he ranks 24th in batting average, 15th in on-base percentage and second in slugging percentage.
• Yandy Diaz's .452 slugging percentage leads his team. He has a batting average of .296 with an on-base percentage of .369.
• He is currently 10th in batting average, 18th in on-base percentage and 51st in slugging percentage among all qualifying hitters.
• Liam Hicks is hitting .282 with 10 doubles, a triple, 15 home runs and 42 walks.
• Jonathan Aranda has a .375 on-base percentage to lead his team.

Mariners vs Rays Head to Head

• 8/7/2026: 2-1 TB (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -112, Underdog Moneyline: +102)
• 7/12/2026: 8-2 SEA (Favorite: Rays, Spread: -1.5, Total: 7.5, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 7/11/2026: 6-1 TB (Favorite: Rays, Spread: -1.5, Total: 7, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 7/10/2026: 7-2 TB (Favorite: Rays, Spread: -1.5, Total: 8.5, Favorite Moneyline: -120, Underdog Moneyline: +102)
• 9/3/2025: 9-4 TB (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 9/2/2025: 6-5 TB (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 9/1/2025: 10-2 TB (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 8/10/2025: 6-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -180, Underdog Moneyline: +152)
• 8/9/2025: 7-4 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 8/8/2025: 3-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -130, Underdog Moneyline: +110)

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