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

Odds updated as of 9:12 a.m.

MLB action on Wednesday includes the Boston Red Sox playing the Seattle Mariners.

We've got you covered, in terms of the most important information regarding this matchup before you take a look at the MLB odds and spreads on FanDuel Sportsbook.

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 are 4-4-0 ATS this season when he starts. Sandoval's team has a record of 4-1 this season when he starts and they are the favorite on the moneyline. The Mariners are 1-14-0 ATS in Miller's 15 starts with a set spread. The Mariners were the underdog on the moneyline for three Miller starts this season -- they lost every 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

• The moneyline numbers for Red Sox vs. Mariners reveal Boston as the favorite (-134) and Seattle as the underdog (+116) on the road.

Red Sox vs Mariners Spread

• The Mariners are +1.5 on the spread (-182 to cover), and Boston is +150 to cover the runline.

Red Sox vs Mariners Over/Under

• An over/under of 8.5 has been set for Red Sox-Mariners on Sept. 2, with the over being -106 and the under -114.

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

Red Sox vs Mariners Betting Trends

• The Red Sox have been victorious in 51, or 53.7%, of the 95 contests they have been chosen as favorites in this season.
• Boston has a record of 28-25 in contests when bookmakers favor them by -134 or more on the moneyline.
• The Red Sox's games have gone over the total 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 been the underdog on the moneyline 32 total times this season. They've gone 11-21 in those games.
• When playing as a moneyline underdog with odds of +116 or longer, Seattle has a 3-8 record (winning just 27.3% of its games).
• The Mariners have had an over/under set by oddsmakers 137 times, and have combined with opponents to go over the total in 70 of those games (70-61-6).
• The Mariners have covered only 37.2% of their games this season, going 51-86-0 ATS.

Red Sox Player Leaders

• Wilyer Abreu has 32 doubles, four triples, 23 home runs and 62 walks while batting .256. He has an on-base percentage of .334 and a slugging percentage of .465.
• Among qualified hitters, he is 65th in batting average, 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.
• His batting average ranks 21st among qualified players, his on-base percentage 92nd, and his slugging percentage 49th.
• Caleb Durbin is batting .251 with a .386 slugging percentage and 62 RBI this year.
• Jarren Duran has been key for Boston with 102 hits, an OBP of .263 plus a slugging percentage of .368.
• Duran takes a two-game hitting streak into this game. 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 qualifying hitters in MLB, he ranks 38th in batting average, 19th in on-base percentage and 36th in slugging percentage.
• Josh Naylor's .366 slugging percentage paces his team. He has a batting average of .268 with an on-base percentage of .328.
• He is currently 50th in batting average, 79th in on-base percentage and 120th in slugging percentage among all qualified hitters.
• 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 batting .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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