Kristaps Porzingis scored nine of his 30 points in the final 2:34 on Wednesday night for the visiting Boston Celtics, who overcame a late six-point deficit to beat the New York Knicks 108-104 in the season opener for both teams.

Porzingis drained all six of his free throws down the stretch and hit a 3-pointer with 1:29 left that put Boston ahead for good at 104-101. His perfect performance from the foul line highlighted a fourth quarter in which the Celtics made 14 of 15 free throws. They finished the game 22-for-26 from the line.

Porzingis' 30 points are the most ever by a Celtics player in his first game for the team. The 7-foot-3 center, who spent the first three seasons of his career with the Knicks, was acquired from the Washington Wizards on June 23.

Jayson Tatum (34 points, 11 rebounds) had a double-double for the Celtics, who led by as many as 12 in the third quarter and opened the fourth with a nine-point lead before the Knicks stormed back.

RJ Barrett and Immanuel Quickley each had 24 points for the Knicks, who were 18 of 41 from 3-point land but just 14 of 26 from the free-throw line, including 5 of 9 in the fourth quarter.

Julius Randle (14 points. 11 rebounds) had a double-double while Jalen Brunson scored 15 points but shot just 6-for-21 from the field. Quentin Grimes added 11 points.

Barrett scored the first seven points of the fourth to begin a 13-2 run for the Knicks, who took their first lead at 86-84 on Josh Hart's 3-pointer with 8:56 left. New York twice opened up a six-point lead, the last time at 101-95 on Brunson's floater with 3:39 left, before Jrue Holiday's layup began the Celtics' game-ending run.

The Knicks missed their next six shots from the field, a span in which Porzingis scored nine unanswered points. Isaiah Hartenstein converted a putback with 18 seconds left to cut the Celtics' lead to 106-104, but Payton Pritchard hit a pair of free throws and Brunson missed two 3-point attempts in the waning seconds.

Boston led 51-46 at the break behind 19 points from Tatum. Barrett paced New York with 14.

--Field Level Media