Bret Boone retired Wednesday at New York Mets camp, the culmination of a swift decline for a player who was one of baseball's best second basemen only a few years ago. Boone's production had plummeted dramatically since the 2003 season. The three-time All-Star was cut by the Seattle Mariners last July 3, dealt to Minnesota eight days later, then released by the Twins on Aug 1. He batted .221 with seven homers and 37 RBIs in 326 plate appearances last season.