GLENDALE, Ariz. -- Zack Greinke hinted several weeks ago that he might soon have more to say about an opt-out clause in his contract that could make him a free agent this November. But after reporting to spring training on Thursday, he was as tight-lipped as before.For perfectly obvious reasons."I've thought about it some, but maybe it's just a question you guys ask me because I answer some questions I shouldn't. It seems to be a pretty obvious thing that it's something you don't really talk about," Greinke said.