Mariners vs Rays Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 8

Odds updated as of 5:13 a.m.

On Saturday in MLB, the Seattle Mariners are up against 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: Saturday, August 8, 2026
• Time: 9:50 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: (-122) | TB: (+104)
• Spread: SEA: -1.5 (+180) | TB: +1.5 (-220)
• Total: 7 -- Over: (-122) | Under: (+100)

Mariners vs Rays Probable Starting Pitchers

Probable Pitchers: George Kirby (Mariners) - 8-9, 3.76 ERA vs Griffin Jax (Rays) - 6-9, 3.63 ERA

The Mariners will call on George Kirby (8-9) versus the Rays and Griffin Jax (6-9). Kirby's team is 7-14-0 against the spread this season in his starts. Kirby's team has a record of 11-10 this season when he starts and they are the favorite on the moneyline. The Rays have gone 9-9-0 against the spread when Jax starts. The Rays have been the moneyline underdog in five of Jax's starts this season, and they went 2-3 in those matchups.

Mariners vs Rays Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Rays win (51.7%)

Mariners vs Rays Moneyline

• Looking at the moneyline for Mariners-Rays, Seattle is the favorite at -122, and Tampa Bay is +104 playing on the road.

Mariners vs Rays Spread

• The Rays are at the Mariners, and are +1.5 on the runline. The Rays are +180 to cover the spread, and the Mariners are -220.

Mariners vs Rays Over/Under

• The over/under for the Mariners versus Rays contest on Aug. 8 has been set at 7, with -122 odds on the over and +100 odds on the under.

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Mariners vs Rays Betting Trends

• The Mariners have won in 49, or 50.5%, of the 97 contests they have been named as odds-on favorites in this year.
• This season Seattle has been victorious 44 times in 79 chances when named as a favorite of at least -122 on the moneyline.
• The Mariners' games have gone over the total in 57 of their 116 opportunities.
• The Mariners have an against the spread record of 41-75-0 in 116 games with a line this season.
• The Rays have won 17 of the 35 games they were the moneyline underdog this season (48.6%).
• Tampa Bay has a 9-11 record (winning 45% of its games) when playing as a moneyline underdog of +104 or longer.
• The Rays have had an over/under set by bookmakers 113 times, and have combined with opponents to go over the total in 51 of those games (51-60-2).
• The Rays have gone 65-48-0 ATS this season.

Mariners Player Leaders

• Randy Arozarena has 113 hits to go with a slugging percentage of .451, both of which lead Seattle hitters this season. He has a .282 batting average and an on-base percentage of .376.
• Among qualifying hitters in baseball, his batting average ranks 27th, his on-base percentage ranks 13th, and he is 53rd in slugging.
• Julio Rodriguez is hitting .260 with 16 doubles, 18 home runs and 35 walks, while slugging .429 with an on-base percentage of .323.
• Among qualified hitters, his batting average places him 63rd, his on-base percentage 85th, and his slugging percentage 72nd.
• Rodriguez takes a seven-game streak with at least one hit into this one. In his last 10 games he is batting .316 with three home runs, five walks and six RBIs.
• Cole Young has 112 hits this season and has a slash line of .263/.323/.411.
• Josh Naylor has eight home runs, 40 RBI and a batting average of .258 this season.

Rays Player Leaders

• Junior Caminero has accumulated a team-best OBP (.375), and paces the Rays in hits (123). He's batting .283 and slugging.
• Including all qualified hitters, he ranks 26th in batting average, while his on-base percentage is 14th and he is second in slugging.
• Yandy Diaz is slugging .452 to lead his team. He has a batting average of .296 with an on-base percentage of .369.
• Including all qualifying hitters, he is ninth in batting average, 18th in on-base percentage and 52nd in slugging percentage.
• Liam Hicks has 10 doubles, a triple, 15 home runs and 42 walks while hitting .282.
• Jonathan Aranda paces his team with a .375 on-base percentage.

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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