Mariners vs Rays Prediction, Odds, Moneyline, Spread & Over/Under for Sept. 1

Odds updated as of 6:11 a.m.

MLB action on Monday includes the Seattle Mariners playing the Tampa Bay Rays.

We've got you covered, in terms of the vital info regarding this game before you take a look at the MLB odds and spreads on FanDuel Sportsbook.

Mariners vs Rays Game Info

• Seattle Mariners (73-64) vs. Tampa Bay Rays (67-69)
• Date: Monday, September 1, 2025
• Time: 7:35 p.m. ET
• Venue: George M. Steinbrenner Field -- Tampa, Florida
• Coverage: FDSSUN and ROOT Sports NW

Mariners vs Rays Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-120) | TB: (+102)
• Spread: SEA: -1.5 (+134) | TB: +1.5 (-162)
• Total: 8.5 -- Over: (-114) | Under: (-106)

Mariners vs Rays Probable Starting Pitchers

Probable Pitchers: Luis Castillo (Mariners) - 8-7, 3.75 ERA vs Shane Baz (Rays) - 8-11, 5.19 ERA

This contest's pitching matchup is set, as the Mariners will send Luis Castillo (8-7) to the mound, while Shane Baz (8-11) will take the ball for the Rays. Castillo's team is 12-15-0 against the spread this season in his starts. Castillo's team is 11-9 this season when he starts and they are the moneyline favorite. The Rays have an 11-14-0 ATS record in Baz's 25 starts with a set spread. The Rays are 4-6 in Baz's 10 starts this season that 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 (50.1%)

Mariners vs Rays Moneyline

• Seattle is the favorite, -120 on the moneyline, while Tampa Bay is a +102 underdog despite being at home.

Mariners vs Rays Spread

• The Mariners are at the Rays and are favored by 1.5 runs (+134 to cover) on the runline. Tampa Bay is -162 to cover.

Mariners vs Rays Over/Under

• The over/under for the Mariners versus Rays game on Sept. 1 has been set at 8.5, with -114 odds on the over and -106 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 92 games this year and have walked away with the win 52 times (56.5%) in those games.
• This season Seattle has come away with a win 46 times in 79 chances when named as a favorite of at least -120 on the moneyline.
• Contests with the Mariners have gone over the total set by bookmakers in 69 of 132 chances this season.
• In 132 games with a line this season, the Mariners have a mark of 56-76-0 against the spread.
• The Rays have won 39.1% of the games this season they were the moneyline underdog (25-39).
• Tampa Bay is 19-23 (winning 45.2% of its games) when playing as a moneyline underdog of +102 or longer.
• In the 131 games bookmakers have set an over/under for the Rays, they have combined with opponents to go over the total 55 times (55-69-7).
• The Rays have covered 43.5% of their games this season, going 57-74-0 ATS.

Mariners Player Leaders

• Cal Raleigh leads Seattle in OBP (.353) and total hits (120) this season. He's batting .240 batting average while slugging .579.
• Among all qualified hitters in the majors, his batting average ranks 118th, his on-base percentage ranks 35th, and he is fourth in slugging.
• Julio Rodriguez has an OPS of .781, fueled by an OBP of .318 and a team-best slugging percentage of .463 this season. He's batting .266.
• His batting average is 58th among qualified players, his on-base percentage 99th, and his slugging percentage 50th.
• Rodriguez heads into this game looking to extend his seven-game hit streak. During his last 10 games he is batting .368 with a double, two home runs, two walks and eight RBIs.
• Josh Naylor is batting .283 with a .442 slugging percentage and 73 RBI this year.
• Eugenio Suarez is batting .236 with a .308 OBP and 105 RBI for Seattle this season.

Rays Player Leaders

• Junior Caminero paces the Rays with 130 hits. He's batting .254 and slugging .526 with an on-base percentage of .297.
• Including all qualified hitters in the majors, his batting average puts him 87th, his on-base percentage ranks 133rd, and he is 11th in slugging.
• Yandy Diaz's .344 OBP and .469 slugging percentage both lead his team. He has a batting average of .284.
• Including all qualified hitters, his batting average puts him 22nd, his on-base percentage ranks 48th, and he is 42nd in slugging.
• Brandon Lowe is batting .264 with 13 doubles, 28 home runs and 34 walks.
• Chandler Simpson is batting .291 with 11 doubles, three triples and 18 walks.

Mariners vs Rays Head to Head

• 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)
• 8/28/2024: 6-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -158, Underdog Moneyline: +134)
• 8/27/2024: 3-2 TB (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -162, Underdog Moneyline: +136)
• 8/26/2024: 5-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 6/26/2024: 5-2 SEA (Favorite: Rays, Spread: -1.5, Total: 7, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 6/25/2024: 11-3 TB (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 6/24/2024: 4-3 TB (Favorite: Rays, Spread: -1.5, Total: 7.5, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 9/10/2023: 6-3 TB (Favorite: Rays, Spread: -1.5, Total: 8, Favorite Moneyline: -142, Underdog Moneyline: +120)

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