Tatum beats buzzer, Celtics edge Nets 115-114 in Game 1

Miami Heat guard Max Strus dunks over Atlanta Hawks forward Danilo Gallinari (8) and guard Bogdan Bogdanovic (13) during the second half of Game 1 of an NBA basketball first-round playoff series, Sunday, in Miami. The Heat won 115-91. (AP Photo/Lynne Sladky)

Boston Celtics forward Jayson Tatum (0) celebrates after making a layup at the buzzer to score and win Game 1 of an NBA basketball first-round Eastern Conference playoff series against the Brooklyn Nets, Sunday, in Boston. The Celtics won 115-114. (AP Photo/Steven Senne)

BOSTON — 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.