BOSTON — Jayson Tatum made five 3-pointers and scored 32 points and the Boston Celtics overcame Luka Doncic’s second straight triple-double to beat the Dallas Mavericks 138-110 on Friday night and extend their NBA season-best winning streak to 10 games. Jaylen Brown added 25 points and seven rebounds as the Celtics knocked down 21 3s
