Jaylen Brown scored 22 points, Porzingis made an immediate impact off the bench and added 20 and the Boston Celtics powered past the Dallas Mavericks 107-89 on Thursday night in Game 1.
Derrick White finished with 15 points for Boston, which led by 29 points in the first half and connected on 16 3-pointers in a powerful start to its quest for an 18th NBA title.
Porzingis, a 7-footer who had been sidelined since April 29, added six rebounds and three blocks in 21 minutes.