Report: Dirk Nowitzki Beginning Record-Breaking 21st Season Thursday vs. PhoenixDallas forward Dirk Nowitzki is finally ready to begin his 21st NBA season on Thursday, a new league record for longest career with one team.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceDallas forward Dirk Nowitzki is finally ready to begin his 21st NBA season on Thursday, a new league record for longest career with one team.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Dec 13, 2018 | Modified Dec 13, 2018SI STAFFShare on FacebookShare on XHome/NBA