Mariners at Red Sox Predictions, Odds and Betting Picks
Jesse M. Cox Published 02/09/2026
The Seattle Mariners +113 at DraftKings are the preferred moneyline play against the Boston Red Sox -136 at DraftKings in Wednesday's 4:10 p.m. ET matchup at Fenway Park. Seattle snapped a five-game losing streak with a 9-6 win Tuesday, while Bryce Miller brings a 4.12 ERA and 92 strikeouts into the series finale.
Boston still owns the home-field edge, but the starting pitching matchup is close, and Seattle's offense just scored nine runs against the Red Sox. The neutral 70°F weather and 7-8 mph wind also remove the major weather concerns for the afternoon game.
Mariners vs Red Sox Game Preview
Seattle enters the finale at 65-74 after ending its five-game skid with Tuesday's 9-6 victory. Lazaro Montes hit a home run in his MLB debut, while Randy Arozarena also went deep, giving the Mariners two major offensive contributions in the win. The victory also gives Seattle a chance to take the series after dropping the first two games of the set.
MARINERS vs. RED SOX: Official Full Game Highlights (September 1) | 2026 MLB Season
Boston is 75-64 and enters Wednesday's game after allowing nine runs Tuesday. Patrick Sandoval gets the start with a 1-3 record and 4.20 ERA, while Seattle counters with Bryce Miller, who is 4-8 with a 4.12 ERA and 92 strikeouts. The starting pitching numbers are nearly identical in ERA, but Miller enters with a higher strikeout total.
Both clubs have notable injury issues. Boston is managing Adley Rutschman's hyperextended right elbow, while Willson Contreras landed on the 10-day injured list August 31 with a recurring left hamstring strain. Seattle has Nick Davila and Emerson Hancock on the 15-day injured list, while Brendan Donovan remains on the seven-day concussion list.
Moneyline Pick
Take the Mariners ML at +113. Seattle offers the better price after winning 9-6 Tuesday and enters Wednesday with Miller's 4.12 ERA against Sandoval's 4.20 ERA. The difference between the starting pitchers is small, but the DraftKings price gives Seattle a clear underdog payout.
Miller also brings 92 strikeouts into the matchup, while Boston's recent pitching situation has been affected by injuries to Garrett Crochet and Kutter Crawford. Seattle's lineup showed its ceiling Tuesday by producing nine runs, including home runs from Montes and Arozarena.
Pick: Mariners ML (+113 at DraftKings).
Run Line Pick
Take the Mariners +1.5 at -186. Seattle's +1.5 run line provides a stronger cushion after the Mariners won Tuesday by three runs and face a Boston starter with a 4.20 ERA. The DraftKings price is expensive at -186, but it reflects the protection of having 1.5 runs on the Seattle side.
Boston is favored at -1.5 despite entering the game after allowing six runs in the previous matchup. Seattle's ability to score nine runs Tuesday makes the +1.5 position the safer run-line route.
Pick: Mariners +1.5 (-186 at DraftKings).
Best Player Prop
- Bryce Miller strikeouts Over 5.5 (-110 at DraftKings). Miller has 92 strikeouts this season and faces a Boston lineup after the Red Sox scored six runs Tuesday. His 4.12 ERA is supported by a strikeout-based path to limiting hard contact, and the afternoon setting at Fenway Park gives him a clean pitching environment without significant wind.
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Game Total Pick
Take Under 8.5 runs at -110. The total sits at 8.5 at DraftKings, and both starting pitchers enter with ERAs close to 4.00. Miller owns a 4.12 ERA, while Sandoval is at 4.20, giving this matchup two starters who are not being priced as high-end aces but are also not carrying extreme run-prevention numbers.
The strongest argument for the Under is the weather. Fenway Park is expected to be 70°F with partly cloudy skies and light 7-8 mph breezes, creating neutral scoring conditions rather than a strong wind advantage. Boston's injury situation also includes Rutschman's elbow issue and Contreras' hamstring injury, while Seattle is without multiple injured pitchers.
Tuesday's nine-run game is the main argument against the Under, but that result also pushed the market toward a higher scoring expectation. Polymarket traders currently price Over 8.5 at 49 USD cents and Under 8.5 at 52 USD cents, showing only a small lean toward the Under.
Pick: Under 8.5 (-110 at DraftKings).
How to Watch Mariners vs Red Sox and Game Info
- Location: Fenway Park, Boston, MA
- Date: Wednesday, September 2, 2026
- First pitch: 4:10 p.m. ET
- TV: Red Sox - NESN; Mariners - Mariners.TV
- Mariners starting pitcher: Bryce Miller (4-8, 4.12 ERA).
- Red Sox starting pitcher: Patrick Sandoval (1-3, 4.20 ERA).
- Weather forecast: 70°F, partly cloudy with clean air, wind around 7-8 mph, 0%-4% chance of rain.
Final Takeaways
The Mariners ML at +113 is the top betting choice. Miller's 4.12 ERA and 92 strikeouts give Seattle a starting pitching matchup that is close to Boston's Sandoval, who owns a 4.20 ERA. Seattle also enters after scoring nine runs Tuesday, while Boston continues to deal with important injuries to Rutschman and Contreras. The +1.5 run line at -186 offers additional protection, while the Under 8.5 at -110 is supported by neutral 70°F weather and light winds.
Check the latest odds and line movement for Mariners vs Red Sox at betting.net before placing your bets. All odds as of September 2, 2026. Odds sourced from DraftKings.