Mets manager Terry Collins remains optimistic that Johan Santana (shoulder) will return this season. Santana has begun doing mound workouts down at the Mets' spring training complex in Port St. Lucie, Florida. If he's able to avoid setbacks and progress quickly to simulated games, there's a chance he could be ready for major league action by the last week of September. Collins suggested that the left-hander could be used in relief.