The market could intensify for free-agent second baseman Luis Castillo. Both the Astros and Mets remain interested, and other teams might jump in. The Indians could pursue Castillo if they trade shortstop Jhonny Peralta and move second baseman Asdrubal Cabrera to short. The Padres view Castillo as a fallback position if they fail to add punch in their outfield. The Dodgers also could enter the mix if Jeff Kent declines to return.