BOSTON — Red Sox starter Brayan Bello showed his athleticism while covering first base during the first inning Tuesday. He stretched out fully and kept his foot on the bag to complete a 3-6-1 double play and escape a bases-loaded jam. He fell to the dirt once the play was completed.

Brayan Bello works five innings in his first start of the season, and Alex Bregman and Triston Casas each drive in three runs.

Triston Casas hit a three-run home run that helped propel the Boston Red Sox to an 8-3 victory over the visiting Seattle Mariners on Tuesday in the first matchup of a three-game series.