New York Mets left-hander Johan Santana, who missed the entire 2011 season recovering from surgery to repair a torn anterior capsule in his left shoulder, hopes to be ready for Opening Day but is making no assurances. Santana threw on flat ground from a distance of 90 feet Thursday at the Mets' spring-training complex in Port St. Lucie, Fla., as he works back from Sept. 14, 2010 surgery. He had made a handful of rehab starts at the end of last season before being shut down for the winter to allow his body to recuperate.