Johan Santana (shoulder) reported no issues in Saturday's bullpen session, and is expected to be formally named the Opening Day starter. The Mets are cautiously optimistic Santana will be able to start Thursday's opener, but acknowledged that they won't risk putting him out there if he's feeling any discomfort. ''He's healthy,'' manager Terry Collins said. ''His arm felt good. His body recuperated from the other day. We're going to sit down with a number of people involved and make something official tomorrow." Santana, 33, will be 19 months removed from shoulder surgery next month.