Seattle Mariners at Boston Red Sox: Final Score & Recap
Line Score
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | R | H | E |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SEA | 1 | 0 | 1 | 0 | 1 | 4 | 1 | 0 | 0 | 0 | 8 | 11 | 0 |
| BOS | 1 | 2 | 0 | 0 | 2 | 0 | 0 | 2 | 1 | 1 | 9 | 12 | 0 |
The Story
The Boston Red Sox edged the Seattle Mariners 9-8 in ten innings at Fenway Park on August 31, 2026, in a game that swung dramatically in both directions before the home side ultimately prevailed. The DiamondIQ model entered the contest estimating a 62 percent home win probability, and while that figure fluctuated sharply throughout the night, it closed at 100 percent once Boston pushed across the walk-off run in the bottom of the tenth.
The decisive moments were bookended by a Seattle surge and a Boston recovery. In the top of the sixth, Dominic Canzone's double off Tyron Guerrero shifted win probability 30.3 points in Seattle's favor, capping a four-run frame that gave the Mariners what appeared to be a comfortable cushion. But Boston chipped away, and the game's single most impactful at-bat came in the bottom of the ninth, when Roman Anthony drilled a triple off closer Andrés Muñoz that swung win probability 38.8 points toward Boston and kept the Red Sox alive. Trevor Story had already set the table in the eighth with a double off Eduard Bazardo that added 23.3 points of win probability, and in the tenth, Nick Sogard's sacrifice bunt off Cooper Criswell moved the winning run into position, adding 19.5 points. Cole Young's strikeout against Aroldis Chapman to open the top half of the tenth represented the final turning point in Seattle's favor that never materialized, costing the Mariners 18.0 points of win probability.
Anthony finished as the game's top performer by WPA at plus 50.8 percent with a RE24 of plus 2.0, while Randy Arozarena contributed plus 35.7 percent WPA and led all batters with a RE24 of plus 3.5. Story rounded out the top three offensive contributors at plus 34.6 percent WPA and plus 2.1 RE24. On the mound, Gabe Speier paced Boston's relievers at plus 9.7 percent WPA, followed by Seranthony Domínguez at plus 7.5 percent and Alec Gamboa at plus 4.5 percent, a trio that collectively stabilized the bullpen long enough for the offense to complete the comeback.