Roy Oswalt has thrown bullpen sessions every other day for the past six weeks and believes he can be ready to join the Rangers after about four starts. Oswalt's first start at Triple-A Round Rock is slated for Saturday. "My arm feels great, my body feels great," the right-hander said. "I think we'll go out and try to have a 50- or 60-pitch count that first game and I'm hoping after about four starts to be ready to join the team." Oswalt, 34, said his back feels good and that others "have worse cases than I have."