Mets pitcher Pedro Martinez can start throwing Saturday as part of his recuperation from October rotator cuff surgery. Team physician Dr. David Altchek gave the approval for Martinez's next step, general manager Omar Minaya said Friday. Minaya said the most realistic expectation is for the three-time Cy Young Award to return by August. "We're probably being very conservative with him," Minaya said. "A lot of it has to do with, psychologically, where is he at?"