The Red Sox opened their series against the Mariners with an 8-3 victory at Fenway Park.
Brayan Bello picked up the win in his season debut. Triston Casas and Alex Bregman drove in three runs apiece.
Boston has won six out of its last seven games.
Bryce Miller was charged with the loss after allowing four runs on five hits and four walks.
Seattle's winning streak was snapped after two games.
(Photo by Maddie Meyer/Getty Images)
Photo: Maddie Meyer / Getty Images Sport / Getty Images