DALLAS — Dirk Nowitzki of the Dallas Mavericks became the NBA’s sixth-leading scorer Monday night with another of his signature long-range jumpers. Nowitzki took Luka Doncic’s handoff and backed down New Orleans’ Kenrich Williams before hitting a turnaround from the top of the free-throw circle with 8:35 left in the first quarter. The basket brought Nowitzki to 31,420 points in his career, one more than Wilt Chamberlain.