Per the Boston Globe: An NBA source said tonight that Detroit free agent forward Rasheed Wallace has committed to sign with the Celtics on July 8 when free agents are able to sign. Wallace is expected to get a two-year deal using the mid-level exception (expected to be about $5.6 million to $5.8 million). Celtics All-Star trio of Kevin Garnett, Ray Allen and Paul Pierce, owner Wyc Grousbeck, coach Doc Rivers and president Danny Ainge met with Wallace last week. Wallace turned down overtures ...