Ex-Husker and New York Yankees' pitcher Joba Chamberlain has started throwing off a half-mound as part of a rehabilitation program after elbow ligament replacement surgery.

Chamberlain threw at the Yankees' minor league complex in Tampa on Friday. The right-hander said the session on the five-inch mound, which New York pitching coach Larry Rothschild and team vice president Billy Connors watched, went well.

Chamberlain went 2-0 with a 2.83 ERA in 27 relief appearances last season before surgery on June 16th. He is expected to rejoin the Yankees at some point in 2012.