During his retirement announcement on Tuesday, Jorge Posada may have revealed that 2012 will be Mariano Rivera's final season. With Posada gone, New York's "Core Four" is now down to two. "Mariano said this is it," Posada said. "He said he has one more year, but Derek [Jeter] said he's got like three more to go." Rivera is entering the final year of a two-year, $30 million contract, while Jeter's commitment to the Yankees runs through 2014. Posada quickly clarified that he doesn't actually believe baseball's all-time saves leader will hang it up after '12. "I don't think so, especially the way he keeps playing," Posada said.