The Red Sox lose their seventh in a row, but the focus is on Rusney Castillo.
The Mariners score seven runs in the fourth inning to beat the Red Sox, 7-3. Brandon Workman gave up all seven runs.
Rusney Castillo signed on the dotted line Saturday afternoon, officially making him a member of the Red Sox for the next seven years.
Rusney Castillo is at Fenway Park for the first time and taking it all in. John Farrell says Castillo is "excited to be here".