Red Sox Outlast Mariners 9-8 in Fenway Slugfest

Boston held off a late Seattle push to escape Fenway Park with a 9-8 win, a one-run margin that turned on a handful of decisive swings. The result adds another entry to a tightly contested 2026 MLB Regular Season stretch for both clubs.

The decisive moment

Boston's 9-8 victory over Seattle came down to the final frames, with the Red Sox holding just enough of a cushion to survive a late Mariners rally. In a game that saw the lead change hands multiple times, Boston's ability to answer every Seattle push proved to be the difference in a one-run finish.

By the numbers

Final score: Boston 9, Seattle 8
Margin of victory: 1 run
Combined runs scored: 17

A 17-run combined total points to an offense-heavy affair at Fenway Park, with both bullpens tested throughout. Close, high-scoring games like this one often hinge on a single at-bat or defensive sequence, and Tuesday's contest was no exception.

What it means

For Boston, the win comes despite a thin pitching staff, with Tanner Houck sidelined on the 60-day injured list with an elbow issue and Isiah Kiner-Falefa also out 60 days with a forearm injury. Curtis Mead remains on the 10-day IL with a wrist injury, though he played catch at Fenway Park on Monday, an encouraging sign for his eventual return.

Seattle, meanwhile, is missing key contributors of its own. Matt Brash remains out 60 days with a lat injury, Emerson Hancock is on the 15-day IL with a groin issue, and Brendan Donovan is on a 7-day IL stint following a concussion. Even shorthanded, the Mariners pushed Boston to the final out, a sign the roster still has offensive punch even without a full complement of healthy players.

What to watch next

Both clubs will look to build on Tuesday's high-scoring affair as the 2026 MLB Regular Season continues. Boston's injury-depleted pitching staff will be under close watch, while Seattle will hope to translate its offensive output into more consistent results in the games ahead.