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

Odds updated as of 12:13 p.m.

The Monday slate in MLB includes a matchup between the Tampa Bay Rays and the Seattle Mariners.

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the most important info regarding this matchup.

Rays vs Mariners Game Info

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

Rays vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: TB: (-108) | SEA: (-108)
• Spread: TB: +1.5 (-176) | SEA: -1.5 (+146)
• Total: 8.5 -- Over: (-112) | Under: (-108)

Rays vs Mariners Probable Starting Pitchers

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

The Rays will look to Shane Baz (8-11) versus the Mariners and Luis Castillo (8-7). When Baz starts, his team is 11-14-0 against the spread this season. When Baz starts a game and his team is the favorite on the moneyline, they have a record of 7-5. The Mariners have gone 12-15-0 against the spread when Castillo starts. The Mariners have a 3-3 record in Castillo's six starts this season when they were the underdog on the moneyline.

Rays vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (51.8%)

Rays vs Mariners Moneyline

• Seattle is a -108 underdog on the moneyline, while Tampa Bay is a -108 favorite at home.

Rays vs Mariners Spread

Rays vs Mariners Over/Under

• The Rays-Mariners game on Sept. 1 has been given an over/under of 8.5 runs. The over is set at -112 and the under at -108.

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Rays vs Mariners Betting Trends

• The Rays have come away with 37 wins in the 62 contests they have been listed as the favorites in this season.
• Tampa Bay has a record of 38-29 when favored by -108 or more this year.
• The Rays' games have gone over the total in 55 of their 131 opportunities.
• The Rays are 57-74-0 against the spread in their 131 games that had a posted line this season.
• The Mariners have been the moneyline underdog 36 total times this season. They've gone 17-19 in those games.
• Seattle is 17-19 (winning 47.2% of its games) when it has played as a moneyline underdog of -108 or longer.
• In the 132 games oddsmakers have set an over/under for the Mariners, they have combined with opponents to go over the total 69 times (69-58-5).
• The Mariners have a 56-76-0 record ATS this season (covering 42.4% of the time).

Rays Player Leaders

• Junior Caminero leads Tampa Bay in total hits (130) this season while batting .254 with 61 extra-base hits. He has an on-base percentage of .297 and a slugging percentage of .526.
• He ranks 87th in batting average, 133rd in on-base percentage, and 11th in slugging among all qualifying hitters in the majors.
• Yandy Diaz leads the Rays with an OPS of .813. He has a slash line of .284/.344/.469 this season.
• He is 22nd in batting average, 48th in on-base percentage and 42nd in slugging in MLB.
• Brandon Lowe is batting .264 with a .493 slugging percentage and 71 RBI this year.
• Lowe has recorded at least one base hit in four games in a row. During his last five outings he is hitting .222 with three home runs, two walks and eight RBIs.
• Chandler Simpson has no home runs, but 22 RBI and a batting average of .291 this season.

Mariners Player Leaders

• Cal Raleigh has accumulated a team-best OBP (.353), while leading the Mariners in hits (120). He's batting .240 and slugging.
• Including all qualified hitters, he ranks 118th in batting average, while his on-base percentage is 35th and he is fourth in slugging.
• Julio Rodriguez leads his team with a .463 slugging percentage. He has a batting average of .266 with an on-base percentage of .318.
• He ranks 58th in batting average, 99th in on-base percentage and 50th in slugging percentage in MLB.
• Josh Naylor has 24 doubles, a triple, 16 home runs and 44 walks while batting .283.
• Eugenio Suarez is batting .236 with 23 doubles, 42 home runs and 38 walks.

Rays vs Mariners 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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