The Dallas Mavericks are retiring Dirk Nowitzki's No. 41 when Stephen Curry and the Golden State Warriors visit in January. NBA Commissioner Adam Silver is expected to attend the Jan. 5 ceremony honoring the only player in league history to play 21 seasons with the same team. The 43-year-old Nowitzki is the franchise leader in points, games, starts, minutes, rebounds, 3-pointers, free throws and blocks.