BOSTON (AP) — Jayson Tatum made a layup at the buzzer off a pass from Marcus Smart to give the Boston Celtics a dramatic 115-114 victory over the Brooklyn Nets on Sunday in the Game 1 of the Eastern Conference first-round series.

Tatum scored 16 of his 31 points in the second half, the final two after a poised Boston possession in the frantic final seconds. Jaylen Brown dribbled toward the middle and swung the ball out to Smart, who fired it into a cutting Tatum, who spun around and dropped in his layup just before time expired.

Brown added 23 points. Al Horford had 20 points and 15 rebounds, and Smart finished with 20 points, including four 3-pointers.

Kyrie Irving had with 39 points, including 18 in the fourth quarter, for Brooklyb. But the Celtics forced the ball out of his hands the last time Brooklyn had it and Kevin Durant missed a jumper with a one-point lead that set up the Celtics’ final possession.

Durant added 23 points, but shot just 9 of 24.

Game 2 is Wednesday night in Boston.