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

Odds updated as of 7:15 a.m.

The MLB's Friday schedule includes the Seattle Mariners facing the Tampa Bay Rays.

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

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 probable starters are Luis Castillo (8-6) for the Mariners and Drew Rasmussen (9-5) for the Rays. Castillo and his team have a record of 10-13-0 against the spread when he starts. Castillo's team is 10-8 this season when he starts and they are the moneyline favorite. The Rays are 11-8-0 against the spread when Rasmussen starts. The Rays have a 4-3 record in Rasmussen's seven starts this season when they were the underdog on the moneyline.

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 hosting the Rays and are favored by 1.5 runs (+152 to cover) on the runline. Tampa Bay is -184 to cover.

Mariners vs Rays Over/Under

• A combined run total of 7 has been set for Mariners-Rays on Aug. 8, with the over 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.
• Seattle has a record of 30-20 when favored by -132 or more this year.
• The Mariners and their opponents have gone over the total this season in 59 of their 113 opportunities.
• The Mariners are 49-64-0 against the spread in their 113 games that had a posted line this season.
• The Rays have won 22 of the 53 games they were the moneyline underdog this season (41.5%).
• When playing as a moneyline underdog with odds of +112 or longer, Tampa Bay has gone 14-13 (51.9%).
• The Rays have combined with opponents to hit the over on the total 43 times this season for a 43-63-6 record against the over/under.
• The Rays have a 49-63-0 record ATS this season (covering 43.8% of the time).

Mariners Player Leaders

• Cal Raleigh leads Seattle in total hits (105) this season while batting .248 with 58 extra-base hits. He has an on-base percentage of .356 and a slugging percentage of .583.
• Among qualified hitters 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 ranks 19th in batting average, 36th in on-base percentage and 64th in slugging in the major leagues.
• Eugenio Suarez has 99 hits this season and has a slash line of .239/.308/.554.
• Julio Rodriguez leads Seattle in slugging percentage (.438) thanks to 43 extra-base hits.
• Rodriguez brings a five-game hitting streak into this game. 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 a .466 slugging percentage, which leads the Rays. He's batting .279 with an on-base percentage of .340.
• Including all qualifying hitters, he is 31st in batting average, while his on-base percentage ranks 58th and he is 45th in slugging.
• Junior Caminero has racked up 109 hits to lead his team. He has a batting average of .253 while slugging .509 with an on-base percentage of .293.
• His batting average ranks 94th among all qualified players, his on-base percentage ranks 145th, and he is 15th in slugging.
• Brandon Lowe has 12 doubles, 20 home runs and 26 walks while hitting .274.
• Chandler Simpson is hitting .293 with nine doubles, a triple and 13 walks.

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