Red Sox vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for Sept. 2

Odds updated as of 3:12 p.m.

The MLB schedule on Wednesday includes the Boston Red Sox facing the Seattle Mariners.

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

Red Sox vs Mariners Game Info

• Boston Red Sox (75-64) vs. Seattle Mariners (65-74)
• Date: Wednesday, September 2, 2026
• Time: 4:10 p.m. ET
• Venue: Fenway Park -- Boston, Massachusetts
• Coverage: NESN and Mariners.TV

Red Sox vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: BOS: (-144) | SEA: (+122)
• Spread: BOS: -1.5 (+146) | SEA: +1.5 (-178)
• Total: 8.5 -- Over: (-105) | Under: (-115)

Red Sox vs Mariners Probable Starting Pitchers

Probable Pitchers: Patrick Sandoval (Red Sox) - 1-3, 4.20 ERA vs Bryce Miller (Mariners) - 4-8, 4.12 ERA

The Red Sox will call on Patrick Sandoval (1-3) versus the Mariners and Bryce Miller (4-8). When Sandoval starts, his team is 4-4-0 against the spread this season. Sandoval's team has a record of 4-1 this season when he starts and they are the favorite on the moneyline. When Miller starts, the Mariners have gone 1-14-0 against the spread. The Mariners were the moneyline underdog for three Miller starts this season -- they lost every game.

Red Sox vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Red Sox win (53.5%)

Red Sox vs Mariners Moneyline

• The Red Sox vs Mariners moneyline has Boston as a -144 favorite, while Seattle is a +122 underdog on the road.

Red Sox vs Mariners Spread

• The Mariners are at the Red Sox, and are +1.5 on the runline. The Mariners are +146 to cover the spread, and the Red Sox are -178.

Red Sox vs Mariners Over/Under

• Red Sox versus Mariners, on Sept. 2, has an over/under of 8.5, with the over being -105 and the under -115.

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Red Sox vs Mariners Betting Trends

• The Red Sox have been favorites in 95 games this season and have come away with the win 51 times (53.7%) in those contests.
• Boston has a record of 20-15 in contests when sportsbooks favor them by -144 or more on the moneyline.
• The Red Sox and their opponents have gone over the total this season in 64 of their 137 opportunities.
• In 137 games with a line this season, the Red Sox have a mark of 66-71-0 against the spread.
• The Mariners have won 11 of the 32 games they were the moneyline underdog this season (34.4%).
• Seattle has gone 2-5 in games it has played as a moneyline underdog with odds of +122 or longer (28.6%).
• The Mariners have played in 137 games with an over/under set, and have combined with their opponents to go over the total 70 times (70-61-6).
• The Mariners have gone 51-86-0 against the spread this season.

Red Sox Player Leaders

• Wilyer Abreu is batting .256 with 32 doubles, four triples, 23 home runs and 62 walks. He has an on-base percentage of .334 while slugging .465.
• Among all qualified hitters in baseball, his batting average ranks 65th, his on-base percentage ranks 64th, and he is 38th in slugging.
• Ceddanne Rafaela leads Boston in slugging percentage (.444) thanks to 51 extra-base hits. He's batting .282 with an on-base percentage of .317.
• Among qualifying batters, he ranks 21st in batting average, 92nd in on-base percentage and 49th in slugging percentage.
• Caleb Durbin is batting .251 with a .386 slugging percentage and 62 RBI this year.
• Jarren Duran has 19 home runs, 68 RBI and a batting average of .207 this season.
• Duran brings a two-game hitting streak into this matchup. In his last five games he is batting .125 with a home run, a walk and two RBIs.

Mariners Player Leaders

• Randy Arozarena a has .369 on-base percentage to pace the Mariners. He's batting .273 while slugging .468.
• Including all the qualified players in the majors, his batting average puts him 38th, his on-base percentage ranks 19th, and he is 36th in slugging.
• Josh Naylor leads his team with a .366 slugging percentage. He has a batting average of .268 with an on-base percentage of .328.
• Including all qualified hitters, he is 50th in batting average, 79th in on-base percentage and 120th in slugging percentage.
• Cole Young is batting .246 with 16 doubles, three triples, 16 home runs and 37 walks.
• Julio Rodriguez has 20 doubles, 20 home runs and 41 walks while hitting .243.

Red Sox vs Mariners Head to Head

• 9/1/2026: 9-6 SEA (Favorite: Red Sox, Spread: -1.5, Total: 7.5, Favorite Moneyline: -118, Underdog Moneyline: +100)
• 8/31/2026: 9-8 BOS (Favorite: Red Sox, Spread: -1.5, Total: 7.5, Favorite Moneyline: -158, Underdog Moneyline: +146)
• 6/21/2026: 3-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 6/20/2026: 5-1 BOS (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -122, Underdog Moneyline: +104)
• 6/19/2026: 6-2 BOS (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 6/18/2025: 3-1 BOS (Favorite: Red Sox, Spread: -1.5, Total: 6.5, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 6/17/2025: 8-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -162, Underdog Moneyline: +136)
• 6/16/2025: 2-0 BOS (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -178, Underdog Moneyline: +150)
• 4/24/2025: 4-3 SEA (Favorite: Red Sox, Spread: -1.5, Total: 8, Favorite Moneyline: -180, Underdog Moneyline: +152)
• 4/23/2025: 8-5 SEA (Favorite: Red Sox, Spread: -1.5, Total: 9.5, Favorite Moneyline: -136, Underdog Moneyline: +116)

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