On Friday, the Cubs claimed right-hander Jason Berken off waivers from the Orioles, and he will be slotted into the rotation.
Berken, 28, was 5-6 with a 3.50 ERA in 26 starts for Triple-A Norfolk, walking 39 and striking out 98 over 144 innings. He had a 1.35 ERA in four April starts, and finished well, compiling a 3.00 ERA (12 earned runs over 36 innings) in six August starts.
Berken made a relief appearance for the Orioles in May before being optioned back to the Minor Leagues. He was the Orioles' sixth-round pick in 2006.
To make room on the roster, the Cubs placed right-hander Blake Parker on the 60-day disabled list with a bone contusion in his right elbow. Parker had been sidelined earlier this season with a stress reaction in his elbow.