"We needed not only help, but experience down there," manager Dusty Baker said. "Corky is used to be being down there and being the backup."
Hopper had spent the entire season with the Bats. He was hitting .280 with no home runs and 20 RBIs for Louisville.
Matt O'Donnell is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.