Racing PositionsSources: Butler traded to Dubs as KD deal fizzles1YShams Charania, Brian WindhorstRozier, Richardson slated for MRIs after Heat loss2YSources: Heat add Richardson, bring back Love3YSources: Pels get Spurs' Richardson for Graham3YTim BontempsCeltics acquire guard White in trade with Spurs4YTim BontempsCeltics welcome back Brown, net win in return5YTim BontempsCeltics secure extensions for Williams, Richardson5YWhy Kyle Lowry is the winner of Mavs moving Richardson's contract5YKevin PeltonSources: C's acquire Richardson, trade Thompson5YTim BontempsSources: Three Mavs out following positive test6YTim MacMahon
