Ragged from overuse and stuffed with new arms untested at the major league level, the bullpen has been at the top of Braves manager Bobby Cox's to-do list for a while. Plan A kicked in Wednesday: Right-hander Jorge Sosa will go to the bullpen, and Cox has told him he will be used as the closer. "I'm happy," Sosa said. "I'm really looking forward to the challenge. I'm going to go out there and be real aggressive. I've got some experience closing in the Dominican, and I know how to go about the job and do the job."