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

Odds updated as of 6:12 p.m.

The Boston Red Sox versus the Seattle Mariners is on the MLB schedule for Tuesday.

All the info you need to make smart bets 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: (-118) | SEA: (+100)
• Spread: BOS: +1.5 (-194) | SEA: -1.5 (+160)
• Total: 7.5 -- Over: (+102) | Under: (-124)

Red Sox vs Mariners Probable Starting Pitchers

Probable Pitchers: Jedixson Páez (Red Sox) - 0-0, 18.00 ERA vs Bryan Woo (Mariners) - 9-9, 4.36 ERA

The probable pitchers are Jedixson Paez for the Red Sox and Bryan Woo (9-9) for the Mariners. Paez did not appear in a game when his team was the moneyline favorite last season. The Mariners are 11-14-0 ATS in Woo's 25 starts with a set spread. The Mariners have a 1-5 record in Woo's six starts this season when 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: Mariners win (55.3%)

Red Sox vs Mariners Moneyline

• Boston is a -118 favorite on the moneyline, while Seattle is a +100 underdog on the road.

Red Sox vs Mariners Spread

• The Mariners are 1.5-run favorites against the spread for this matchup with the Red Sox. The Mariners are +160 to cover, while the Red Sox are -194 to cover as a 1.5-run underdog on the runline.

Red Sox vs Mariners Over/Under

• The over/under for Red Sox-Mariners on Sept. 1 is 7.5. The over is +102, and the under is -124.

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Red Sox vs Mariners Betting Trends

• The Red Sox have been victorious in 51, or 54.3%, of the 94 contests they have been chosen as favorites in this season.
• This season Boston has come away with a win 45 times in 80 chances when named as a favorite of at least -118 on the moneyline.
• The Red Sox and their opponents have gone over in 63 of their 136 games with a total set by sportsbooks this season.
• The Red Sox are 66-70-0 against the spread in their 136 games with a line set by sportsbooks this season.
• The Mariners have been the moneyline underdog 31 total times this season. They've gone 10-21 in those games.
• When it has played as a moneyline underdog with odds of +100 or longer, Seattle has a 7-15 record (winning only 31.8% of its games).
• The Mariners have had an over/under set by oddsmakers 136 times, and have combined with opponents to go over the total in 69 of those games (69-61-6).
• The Mariners have a 50-86-0 record ATS this season (covering just 36.8% of the time).

Red Sox Player Leaders

• Wilyer Abreu is hitting .254 with 31 doubles, four triples, 23 home runs and 62 walks. He has an on-base percentage of .334 while slugging .464.
• He is 72nd in batting average, 64th in on-base percentage, and 37th in slugging among all qualified batters in MLB.
• Ceddanne Rafaela has hit 16 homers this season while driving in 70 runs. He's batting .284 this season and slugging .446 with an on-base percentage of .319.
• Among qualified batters, his batting average ranks him 19th, his on-base percentage 88th, and his slugging percentage 47th.
• 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 an on-base percentage of .371 and has 132 hits, both team-best numbers for the Mariners. He's batting .274 and slugging .465.
• He is 35th in batting average, 16th in on-base percentage and 36th in slugging percentage among all qualified hitters in the big leagues.
• Josh Naylor's .363 slugging percentage leads his team. He has a batting average of .267 with an on-base percentage of .328.
• Including all qualifying hitters, he ranks 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 is batting .244 with 19 doubles, 20 home runs and 41 walks.

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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