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

Odds updated as of 8:13 a.m.

The Wednesday slate in MLB includes a matchup between the Boston Red Sox and the Seattle Mariners.

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.

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: (-134) | SEA: (+116)
• Spread: BOS: -1.5 (+150) | SEA: +1.5 (-182)
• Total: 8.5 -- Over: (-106) | Under: (-114)

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

This contest's pitching matchup is set, as the Red Sox will send Patrick Sandoval (1-3) to the mound, while Bryce Miller (4-8) will get the nod for the Mariners. Sandoval and his team have a record of 4-4-0 against the spread when he starts. Sandoval's team has won 80% of his starts when they are favored on the moneyline (4-1). The Mariners are 1-14-0 against the spread when Miller starts. The Mariners were the underdog on the moneyline for three Miller starts this season -- they lost each time.

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

• Boston is the favorite, -134 on the moneyline, while Seattle is a +116 underdog on the road.

Red Sox vs Mariners Spread

• The Red Sox are favored by 1.5 runs at home versus the Mariners. The Red Sox are +150 to cover the spread, while the Mariners are -182.

Red Sox vs Mariners Over/Under

• A total of 8.5 runs has been set for the Red Sox-Mariners contest on Sept. 2, with the over available at -106 and the under at -114.

Bet on Boston Red Sox vs. Seattle Mariners on FanDuel today!

Red Sox vs Mariners Betting Trends

• The Red Sox have come away with 51 wins in the 95 contests they have been listed as the favorites in this season.
• This year Boston has won 28 of 53 games when listed as at least -134 on the moneyline.
• The Red Sox and their opponents have gone over in 64 of their 137 games with a total set by sportsbooks this season.
• 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 underdog on the moneyline this season (34.4%).
• In games it has played as a moneyline underdog with odds of +116 or longer, Seattle has gone 3-8 (27.3%).
• In the 137 games oddsmakers have set an over/under for the Mariners, they have combined with opponents to go over the total 70 times (70-61-6).
• The Mariners have gone 51-86-0 ATS this season.

Red Sox Player Leaders

• Wilyer Abreu is hitting .256 with 32 doubles, four triples, 23 home runs and 62 walks. He has an on-base percentage of .334 and a slugging percentage of .465.
• Among all qualifying hitters in baseball, he ranks 65th in batting average, 64th in on-base percentage, and 38th in slugging.
• Ceddanne Rafaela has hit 16 homers this season while driving in 70 runs. He's batting .282 this season and slugging .444 with an on-base percentage of .317.
• He is 21st in batting average, 92nd in on-base percentage and 49th in slugging among qualifying batters.
• Caleb Durbin has 111 hits this season and has a slash line of .251/.324/.386.
• Jarren Duran is batting .207 with a .263 OBP and 68 RBI for Boston this season.
• Duran heads into this matchup on a two-game hitting streak. In his last five games he is hitting .125 with a home run, a walk and two RBIs.

Mariners Player Leaders

• Randy Arozarena has accumulated an on-base percentage of .369, a team-high for the Mariners. He's batting .273 and slugging .468.
• Including all the qualified hitters in the big leagues, he ranks 38th in batting average, 19th in on-base percentage and 36th in slugging percentage.
• 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 qualifying hitters, he ranks 50th in batting average, 79th in on-base percentage and 120th in slugging percentage.
• Cole Young is hitting .246 with 16 doubles, three triples, 16 home runs and 37 walks.
• Julio Rodriguez is hitting .243 with 20 doubles, 20 home runs and 41 walks.

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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