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

Odds updated as of 2:12 a.m.

The Boston Red Sox are among the MLB squads playing on Tuesday, versus the Seattle Mariners.

All the information 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 (75-63) vs. Seattle Mariners (64-74)
• Date: Tuesday, September 1, 2026
• Time: 6:45 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: (-124) | SEA: (+106)
• Spread: BOS: -1.5 (+180) | SEA: +1.5 (-220)
• Total: 7.5 -- Over: (-102) | Under: (-120)

Red Sox vs Mariners Probable Starting Pitchers

Probable Pitchers: TBA (Red Sox) vs Bryan Woo (Mariners) - 9-9, 0.00 ERA

The Mariners will give the nod to Woo (9-9, 2.94), while the Red Sox's starter for this game has yet to be determined. When Woo starts, the Mariners have gone 11-14-0 against the spread. The Mariners are 1-5 in Woo's six starts this season that they were the underdog on the moneyline.

Red Sox vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Red Sox win (57.2%)

Red Sox vs Mariners Moneyline

• Seattle is a +106 underdog on the moneyline, while Boston is a -124 favorite at home.

Red Sox vs Mariners Spread

• The Mariners are at the Red Sox, and are +1.5 on the runline. The Mariners are +180 to cover the spread, and the Red Sox are -220.

Red Sox vs Mariners Over/Under

• Red Sox versus Mariners on Sept. 1 has an over/under of 7.5 runs, with the odds on the over -102 and the under set at -120.

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

Red Sox vs Mariners Betting Trends

• The Red Sox have been chosen as favorites in 94 games this year and have walked away with the win 51 times (54.3%) in those games.
• Boston has a record of 40-31 in contests when bookmakers favor them by -124 or more on the moneyline.
• The Red Sox and their opponents have gone over the total this season in 63 of their 136 opportunities.
• The Red Sox are 66-70-0 against the spread in their 136 games with a line set by sportsbooks this season.
• The Mariners are 10-21 in games they were listed as the moneyline underdog (winning 32.3% of those games).
• Seattle is 6-12 (winning only 33.3% of its games) when playing as a moneyline underdog of +106 or longer.
• The Mariners have had an over/under set by bookmakers 136 times, and have combined with opponents to go over the total in 69 of those games (69-61-6).
• The Mariners are 50-86-0 ATS this season.

Red Sox Player Leaders

• Wilyer Abreu is batting .254 with 31 doubles, four triples, 23 home runs and 62 walks. He has an on-base percentage of .334 while slugging .464.
• Among qualified hitters in MLB, he ranks 72nd in batting average, 64th in on-base percentage, and 37th in slugging.
• Ceddanne Rafaela leads Boston in slugging percentage (.446) thanks to 51 extra-base hits. He's batting .284 with an on-base percentage of .319.
• Among all qualifying hitters, he ranks 19th in batting average, 88th in on-base percentage and 48th in slugging percentage.
• Caleb Durbin has collected 111 base hits, an OBP of .327 and a slugging percentage of .390 this season.
• Jarren Duran has 19 home runs, 68 RBI and a batting average of .207 this season.

Mariners Player Leaders

• Randy Arozarena has accumulated an on-base percentage of .371 and has 132 hits, both team-best numbers for the Mariners. He's batting .274 and slugging .465.
• Including all qualified hitters, he is 35th in batting average, while his on-base percentage is 16th and he is 36th in slugging.
• Josh Naylor is slugging .363 to pace his team. He has a batting average of .267 with an on-base percentage of .328.
• Including all qualifying hitters, he is 49th in batting average, 80th in on-base percentage and 121st in slugging percentage.
• Cole Young is batting .244 with 16 doubles, three triples, 16 home runs and 36 walks.
• Julio Rodriguez has 19 doubles, 20 home runs and 41 walks while batting .244.

Red Sox vs Mariners Head to Head

• 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)
• 4/22/2025: 8-3 BOS (Favorite: Red Sox, Spread: -1.5, Total: 9.5, Favorite Moneyline: -122, Underdog Moneyline: +104)

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