 Meanwhile, the Celtics are doing everything they can to keep their championship roster intact. ESPN reporting yesterday that Sam Houser, agreeing to a four-year, $45 million contract extension, he was slated to become a free agent after this upcoming season. Training camp finally here for the NFL. The New England Patriots kicked off mandatory practices with rookies reporting to Gillette Stadium in Foxborough over the weekend. Veterans are scheduled to arrive tomorrow. No holdouts are expected as New England prepares for its first preseason game against the Carolina Panthers on August 8th with their