Yankees closer Mariano Rivera says he's ready to return to the mound after throwing a bullpen session on Tuesday. He threw 10 to 15 pitches in the team's bullpen. "You're never going to feel a hundred percent," Rivera said. "So far, it feels good." Before the bullpen session, New York manager Joe Girardi said he would consider giving Rivera additional rest. Yankees reliever Joba Chamberlain has filled the role of closer in recent games.