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MLB · Final/10

Red Sox Edge Mariners in Thrilling Extra-Inning Showdown

Monday, August 31, 2026, 6:45 PM ET · Fenway Park

Quick answers

Who won Seattle Mariners vs Boston Red Sox?

Boston Red Sox beat Seattle Mariners 9-8 at Fenway Park on August 31, 2026.

Who was favored in Seattle Mariners vs Boston Red Sox?

Boston Red Sox were the favorite at DraftKings, moneyline -148 (about 60% implied). The favorite won.

The Boston Red Sox triumphed over the Seattle Mariners in a nail-biting contest that concluded with a score of 9-8 after ten innings. This match was particularly noteworthy as it marked the final game of a three-game series, which the Mariners won 2-1. The Red Sox entered the game with a home record of 75-63, while the Mariners had an away record of 64-74, showcasing a significant disparity in performance between the two teams.

In terms of recent form, the Red Sox had a 6-4 record in their last ten games but were on a one-game losing streak. They averaged 3.8 runs scored per game while allowing 4.3 runs. Their last five games reflected a struggle, with a record of 2-3 and an average of 2.8 runs scored against 4.8 allowed. The Mariners, on the other hand, had a record of 4-6 in their last ten games and were on a three-game losing streak. They averaged 3.6 runs scored but were allowing a concerning 8.0 runs per game. In their last five games, they managed a record of 2-3, scoring an average of 3.4 runs while allowing 4.4.

At Fenway Park, the Red Sox have been strong, holding a home record of 3-1 in their last four home games. The Mariners, however, have struggled on the road, with a 1-5 record in their last six away games. The matchup between these two teams has been competitive recently, with the Red Sox holding a 4-3 edge in their head-to-head meetings over the last two seasons. In their previous encounters this season, the Mariners secured victories on June 20 and June 21, while the Red Sox won a game on June 17.

Injuries played a role in this matchup, with several key players sidelined. The Red Sox had Ceddanne Rafaela listed as day-to-day due to quadriceps issues, while Johan Oviedo, Kutter Crawford, Zack Kelly, and Justin Slaten were all on the 60-day injured list due to elbow and forearm injuries. The Mariners were also affected, with Victor Robles on bereavement leave, and Cole Wilcox, Brendan Donovan, Matt Brash, and Brennen Davis all on the injured list.

The betting market reflected the Red Sox as the favorites, with DraftKings offering odds of -148 for Boston and +138 for Seattle. The spread was set at -1.5 for the Red Sox, and the total runs over/under was 7.5, with over odds at -110 and under odds at -109.

Conditions for the game were typical for late summer baseball, with a lively atmosphere at Fenway Park. Fans were treated to an exciting contest that saw multiple lead changes and dramatic scoring plays. The scoring began in the fifth inning when Arozarena's single allowed Young to score, tying the game at 3-3. The Red Sox responded with a two-run single from Rafaela, taking a 5-3 lead. However, the Mariners quickly leveled the score again with Arozarena's single in the sixth, which brought in two more runs.

As the game progressed, the Mariners took an 8-5 lead in the seventh inning, thanks to a home run from Raleigh. The Red Sox fought back, scoring two runs in the eighth inning and tying the game in the ninth with a sacrifice fly from Rafaela. The decisive moment came in the tenth inning when Story's single allowed White to score, sealing the Red Sox's victory at 9-8.

This game highlighted the resilience of the Red Sox, who managed to overcome a challenging situation against a Mariners team that had proven competitive throughout the series. Fans watching the game witnessed a thrilling display of baseball, with strategic plays and clutch hitting that kept the outcome uncertain until the final moments.

What we said beforehand

The Boston Red Sox will face off against the Seattle Mariners at Fenway Park on August 31, 2026, with the Red Sox leading the series 2-1. Boston enters this matchup with a home record of 74 wins and 63 losses, while Seattle has an away record of 64 wins and 73 losses. This game is particularly noteworthy as both teams are looking to improve their standings in the league.

In their last five games, the Red Sox have struggled, posting a record of 2 wins and 3 losses. Their recent results include a loss to the Miami Marlins (0-4) and a narrow defeat against the New York Yankees (0-1), followed by a win against the Yankees (6-0), and then two more losses (9-2 and 16-1) in subsequent games. Over this stretch, the Red Sox have averaged 2.8 runs scored per game while allowing 4.8 runs. At home, they have a record of 3 wins and 1 loss in their last four games, averaging 3.8 runs scored and 4.3 runs allowed.

Conversely, the Mariners have also faced challenges, with a record of 2 wins and 3 losses in their last five games. They recently defeated the Philadelphia Phillies (4-1) but then lost three consecutive games to the Toronto Blue Jays (1-8, 3-4, and 0-7). Seattle's recent form shows they have averaged 3.4 runs scored and 4.4 runs allowed in their last five games. Their away record in the last ten games is significantly weaker, with just 1 win and 5 losses.

In terms of head-to-head matchups, the Red Sox hold a slight edge, with a record of 4 wins and 3 losses against the Mariners in their last seven meetings. Notable games from this season include two victories for Boston in June, where they won 5-1 and 6-2 against Seattle. The Mariners will be looking to turn the tide in this series, especially after their recent losses.

Injury concerns could also play a role in this matchup. The Red Sox will be without Isiah Kiner-Falefa, Johan Oviedo, Kutter Crawford, Zack Kelly, and Justin Slaten, all of whom are on the injured list. The Mariners are dealing with injuries to Cole Wilcox (oblique), Brendan Donovan (concussion), Matt Brash (lat), Will Wilson (thumb), and Emerson Hancock (groin). The absence of key players may impact both teams' performances.

The betting market, as reported by DraftKings, has the Red Sox as favorites with a moneyline of -153, while the Mariners are at +142. The spread is set at -1.5 for Boston, and the total runs over/under is 7.5, with odds of -114 for the over and -105 for the under.

Weather conditions for the game are expected to be mild, with a temperature of 72°F and wind gusts reaching 17 mph, which could affect gameplay.

As the game approaches, viewers should watch for the performance of Boston's Willson Contreras, who leads the team with 26 home runs and 79 RBIs, and Seattle's Josh Naylor, who has a batting average of .269. Both players could be pivotal in determining the outcome of this crucial matchup.

Odds

BookSpreadTotalMoneyline
DraftKingsBOS -148 7.5 o -110 / u -109 Seattle Mariners +138 · Boston Red Sox -148

What these prices pay on $100 · What these numbers mean

Injury report

  • Ceddanne RafaelaDay-To-DayQuadricepsBoston Red Sox
  • Johan Oviedo60-Day-ILElbowBoston Red Sox
  • Kutter Crawford60-Day-ILForearmBoston Red Sox
  • Zack Kelly60-Day-ILElbowBoston Red Sox
  • Justin Slaten15-Day-ILElbowBoston Red Sox
  • Victor RoblesbereavementPersonalSeattle Mariners
  • Cole Wilcox15-Day-ILObliqueSeattle Mariners
  • Brendan Donovan7-Day ILConcussionSeattle Mariners
  • Matt Brash60-Day-ILLatSeattle Mariners
  • Brennen Davis60-Day-ILHamstringSeattle Mariners

Recent form

Boston Red Sox

Last 10: 6-4Streak L13.8 scored · 4.3 allowed per game3-1 at home

  • L1-16at New York YankeesAug 30
  • W6-0at New York YankeesAug 29
  • L0-1at New York YankeesAug 28
  • L0-4at Miami MarlinsAug 26
  • W7-3at Miami MarlinsAug 25
  • W4-2at Miami MarlinsAug 24
  • W5-4vs San Francisco GiantsAug 23
  • W3-2vs San Francisco GiantsAug 22
  • W6-4vs San Francisco GiantsAug 21
  • L6-7vs Arizona DiamondbacksAug 19

Seattle Mariners

Last 10: 4-6Streak L33.6 scored · 8 allowed per game1-5 away

  • L0-7at Toronto Blue JaysAug 30
  • L3-4at Toronto Blue JaysAug 29
  • L1-8at Toronto Blue JaysAug 28
  • W4-1vs Philadelphia PhilliesAug 26
  • W9-2vs Philadelphia PhilliesAug 25
  • L2-19vs Chicago CubsAug 23
  • W6-5vs Chicago CubsAug 22
  • L4-7at Milwaukee BrewersAug 20
  • W7-5at Milwaukee BrewersAug 19
  • L0-22at Milwaukee BrewersAug 18

Standings

TeamGames behindLostStreakWin %Won
Houston-69W2.51172
Texas271W1.49670
Seattle675L1.46866
Athletics1786W2.39055
Los Angeles18.587L2.37953
Tampa Bay-57L2.59383
New York360W2.57180
Boston7.565W1.53976
Toronto13.571W2.49670
Baltimore14.572L3.48969

How the scoring went

  1. 1st Inning1-0Rodríguez doubled to left, Arozarena scored.
  2. 1st Inning1-1Gasper homered to right center (387 feet).
  3. 2nd Inning1-3Duran homered to right (409 feet), Sogard scored.
  4. 3rd Inning2-3Arozarena homered to left (402 feet).
  5. 5th Inning3-3Arozarena singled to left, Young scored, Crawford to second, We. Wilson to third.
  6. 5th Inning3-5Rafaela singled to center, Wong scored and Anthony scored.
  7. 6th Inning5-5Arozarena singled to right, We. Wilson scored and Young scored, Crawford to third.
  8. 6th Inning7-5Canzone doubled to left, Arozarena scored and Crawford scored.
  9. 7th Inning8-5Raleigh homered to left (355 feet).
  10. 8th Inning8-7Story doubled to left, Durbin scored and Sogard scored.
  11. 9th Inning8-8Rafaela hit sacrifice fly to left, Anthony scored.
  12. 10th Inning8-9Story singled to center, White scored, Duran to second, Durbin to third.

Win probability

Above the line favours Boston Red Sox, below favours Seattle Mariners.

Venue

  • Fenway ParkBoston, Massachusetts
  • Attendance37487
  • OfficialsLance Barksdale, Will Little, Derek Thomas, Ryan Wills

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Fixture data from the league feeds. The report was written from the recorded facts for this game and nothing else.