Red Sox recall RHP Aro from Triple-A, option RHP Barnes
To make room, the team optioned right-hander Matt Barnes to Pawtucket.
The 24-year-old Aro (0-0, 11.57) is with the team for the third time this season.
Barnes (3-4, 6.89 ERA) took the loss in his second major league start on Saturday night against Kansas City. The 25-year-old gave up five runs in 5 1-3 innings.