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

Odds updated as of 9:12 p.m.

Friday's slate in the MLB includes a matchup between the Seattle Mariners and the Tampa Bay Rays.

Here's what you need to know before checking out today's MLB odds and spreads on FanDuel Sportsbook.

Mariners vs Rays Game Info

• Seattle Mariners (63-53) vs. Tampa Bay Rays (57-59)
• Date: Friday, August 8, 2025
• Time: 9:40 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: ROOT Sports NW and FDSSUN

Mariners vs Rays Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-130) | TB: (+110)
• Spread: SEA: -1.5 (+172) | TB: +1.5 (-210)
• Total: 7 -- Over: (-110) | Under: (-110)

Mariners vs Rays Probable Starting Pitchers

Probable Pitchers: Luis Castillo (Mariners) - 8-6, 3.22 ERA vs Drew Rasmussen (Rays) - 9-5, 2.81 ERA

The Mariners will call on Luis Castillo (8-6) versus the Rays and Drew Rasmussen (9-5). Castillo's team is 10-13-0 against the spread this season in his starts. When Castillo starts a game and his team is the favorite on the moneyline, they have a record of 10-8. When Rasmussen starts, the Rays have gone 11-8-0 against the spread. The Rays are 4-3 in Rasmussen's seven starts this season that they were the moneyline underdog.

Mariners vs Rays Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (50.6%)

Mariners vs Rays Moneyline

• Tampa Bay is a +110 underdog on the moneyline, while Seattle is a -130 favorite at home.

Mariners vs Rays Spread

• The Rays are +1.5 on the run line against the Mariners. The Rays are -210 to cover, and the Mariners are +172.

Mariners vs Rays Over/Under

• The over/under for the Mariners versus Rays contest on Aug. 8 has been set at 7, with -110 odds on the over and -110 odds on the under.

Bet on Seattle Mariners vs. Tampa Bay Rays on FanDuel today!

Mariners vs Rays Betting Trends

• The Mariners have been chosen as favorites in 77 games this year and have walked away with the win 43 times (55.8%) in those games.
• This year Seattle has won 34 of 55 games when listed as at least -130 on the moneyline.
• Contests with the Mariners have gone over the total set by sportsbooks in 59 of 113 chances this season.
• The Mariners are 49-64-0 against the spread in their 113 games that had a posted line this season.
• The Rays have won 41.5% of the games this season they were the moneyline underdog (22-31).
• When it has played as a moneyline underdog with odds of +110 or longer, Tampa Bay has gone 15-13 (53.6%).
• The Rays have played in 112 games with an over/under set, and have combined with their opponents to go over the total 43 times (43-63-6).
• The Rays have gone 49-63-0 against the spread this season.

Mariners Player Leaders

• Cal Raleigh leads Seattle with 105 hits, batting .248 this season with 58 extra-base hits. He has an on-base percentage of .356 and a slugging percentage of .583.
• Among qualifying hitters in the majors, his batting average ranks 105th, his on-base percentage ranks 33rd, and he is fourth in slugging.
• Josh Naylor is hitting .289 with 20 doubles, a triple, 14 home runs and 41 walks, while slugging .451 with an on-base percentage of .355.
• Among all qualifying batters, he is 19th in batting average, 36th in on-base percentage and 64th in slugging percentage.
• Eugenio Suarez has collected 99 base hits, an OBP of .308 and a slugging percentage of .554 this season.
• Julio Rodriguez has an OPS of .747, fueled by an OBP of .309 and a team-best slugging percentage of .438 this season.
• Rodriguez takes a five-game hitting streak into this matchup. During his last five outings he is batting .318 with a double, two home runs, a walk and six RBIs.

Rays Player Leaders

• Yandy Diaz has a .466 slugging percentage, which paces the Rays. He's batting .279 with an on-base percentage of .340.
• Including all the qualifying players in MLB, his batting average is 31st, his on-base percentage ranks 58th, and he is 45th in slugging.
• Junior Caminero leads his team with 109 hits. He has a batting average of .253 while slugging .509 with an on-base percentage of .293.
• He is currently 94th in batting average, 145th in on-base percentage and 15th in slugging percentage among all qualifying batters.
• Brandon Lowe is batting .274 with 12 doubles, 20 home runs and 26 walks.
• Chandler Simpson is batting .293 with nine doubles, a triple and 13 walks.

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