A’s acquire right-hander Rosario from Boston

The Oakland Athletics have acquired right-hander Sandy Rosario
from the Boston Red Sox for a player to be named later or cash

The AL West champion A’s cleared room on the 40-man roster by
designating outfielder Jermaine Mitchell for assignment.

Boston claimed Rosario off waivers from Miami on Oct. 17 after
he spent the year in the Marlins organization. He began the season
with a 1.04 ERA in 25 outings at Triple-A New Orleans while
converting all 16 of his save opportunities. The 27-year-old
right-hander joined the Marlins on June 8, posting an 18.00 ERA in
four relief appearances before going on the disabled list June 16
with a strained right quadriceps. He wasn’t back in the majors
after that.

Earlier Wednesday, the Red Sox sent infielder Danny Valencia to
the Baltimore Orioles for cash.