The Orioles activated Eflin (shoulder) from the 15-day injured list to start Sunday's game against the Rockies.
The right-hander has been sidelined due to shoulder inflammation but is ready to rejoin Baltimore's rotation after a minimum-length stay on the shelf. Eflin was in the midst of a dominant stretch prior to the injury, as he has a 2.32 ERA, 1.03 WHIP and 29:2 K:BB in his past five starts.