The Diamondbacks, Dodgers, Braves and Cubs all are interested in Royals right-hander Zack Greinke, but it is doubtful the Royals would trade him unless they were overwhelmed. Greinke, 23, has excelled as a reliever this season, and some teams still like him as a starter. The Royals, though, control him through 2010. "They can't trade Greinke right now, they can't do it," one rival executive says. "They'd be crazy if they did."