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

Odds updated as of 6:12 a.m.

The Seattle Mariners versus the Tampa Bay Rays is on the MLB schedule for Friday.

Before you do any MLB betting on this matchup at FanDuel Sportsbook, here's what you need to know.

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: (-132) | TB: (+112)
• Spread: SEA: -1.5 (+152) | TB: +1.5 (-184)
• Total: 7 -- Over: (-132) | Under: (+108)

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 in his starts this season. Castillo's team has been victorious in 55.6% of the games he's started as the moneyline favorite with a record of 10-8. The Rays have an 11-8-0 ATS record in Rasmussen's 19 starts that had a set spread. The Rays have been the underdog on the moneyline in seven of Rasmussen's starts this season, and they went 4-3 in those matchups.

Mariners vs Rays Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (51.2%)

Mariners vs Rays Moneyline

• Looking at the moneyline for Rays-Mariners, Tampa Bay is the underdog at +112, and Seattle is -132 playing at home.

Mariners vs Rays Spread

• The Mariners are favored by 1.5 runs at home against the Rays. The Mariners are +152 to cover the spread, while the Rays are -184.

Mariners vs Rays Over/Under

• The Mariners-Rays game on Aug. 8 has been given an over/under of 7 runs. The over is set at -132 and the under at +108.

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

Mariners vs Rays Betting Trends

• The Mariners have come away with 43 wins in the 77 contests they have been listed as the favorites in this season.
• This season Seattle has come away with a win 30 times in 50 chances when named as a favorite of at least -132 on the moneyline.
• The Mariners' games have gone over the total in 59 of their 113 opportunities.
• The Mariners are 49-64-0 against the spread in their 113 games with a line set by sportsbooks this season.
• The Rays have a 22-31 record in games they were listed as the moneyline underdog (winning 41.5% of those games).
• When playing as a moneyline underdog with odds of +112 or longer, Tampa Bay has a 14-13 record (winning 51.9% of its games).
• The Rays have played in 112 games with a set over/under, and have combined with opponents to go over the total 43 times (43-63-6).
• The Rays have a 49-63-0 record ATS this season (covering 43.8% of the time).

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 qualified batters in baseball, his batting average ranks 105th, his on-base percentage ranks 33rd, and he is fourth in slugging.
• Josh Naylor has 20 doubles, a triple, 14 home runs and 41 walks. He's batting .289 and slugging .451 with an on-base percentage of .355.
• He is 19th in batting average, 36th in on-base percentage and 64th in slugging among qualifying batters.
• Eugenio Suarez has collected 99 base hits, an OBP of .308 and a slugging percentage of .554 this season.
• Julio Rodriguez leads Seattle with a slugging percentage of .438, fueled by 43 extra-base hits.
• Rodriguez enters this matchup on a five-game hitting streak. In his last five games he is hitting .318 with a double, two home runs, a walk and six RBIs.

Rays Player Leaders

• Yandy Diaz has put up a team-best .466 slugging percentage. He's batting .279 with an on-base percentage of .340.
• Including all the qualified hitters in the majors, he is 31st in batting average, 58th in on-base percentage and 45th in slugging percentage.
• Junior Caminero's 109 hits lead his team. He has a batting average of .253 while slugging .509 with an on-base percentage of .293.
• Including all qualifying players, he is 94th in batting average, 145th in on-base percentage and 15th in slugging percentage.
• Brandon Lowe is hitting .274 with 12 doubles, 20 home runs and 26 walks.
• Chandler Simpson is hitting .293 with nine doubles, a triple and 13 walks.

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