Jayson Tatum's buzzer-beating layup gave the Boston Celtics a dramatic 115-114 victory over the Brooklyn Nets in their series opener on Sunday.

Tatum scored 16 of his 31 points in the second half, along with adding eight assists, four rebounds, two blocks and a steal. His final two points came in the frenetic final seconds, cutting towards the basket off Kevin Durant for Marcus Smart, spinning past Kyrie Irving and finishing with as time expired.

Smart particularly showed poise, forcing the closeout from Bruce Brown and Nic Claxton before dishing, along with adding 20 points, seven rebounds, six assists and two steals.

While Irving scored a game-high 39 points for the Nets, Durant put up 23 points but went nine-of-24 from the floor, including some open, trailing looks in transition. One miss at 102-98 would have made it a three-possession game in Brooklyn's favour midway through the fourth quarter, but a miss leading to a Jaylen Brown dunk brought it back to one.

It was also at that point where Boston were zero-for-seven for the quarter from the floor, and momentum suddenly shifted.

Giannis yields Bucks win in opener

Giannis Antetokounmpo put up 26 points and 17 rebounds as the Milwaukee Bucks defeated the Chicago Bulls 93-86.

The defending NBA champions blew a 16-point lead, but recovered with a Jrue Holiday triple that triggered an 8-0 run.

The Bulls still had their chances, with Zach LaVine missing a game-tying three-pointer with 29 seconds remaining in what was a rough shooting night. LaVine and DeMar DeRozan shot a combined 12-of-44 as the team connected on only 32.3 per cent of field goal attempts.

Red-hot Robinson gives Heat opening victory

Duncan Robinson set a franchise playoff record with eight three-pointers in a catch-and-shoot clinic, leading the Miami Heat to a 115-91 win against the Atlanta Hawks in their series opener.

Robinson scored 27 points on nine-of-10 shooting for the Eastern Conference's first seed, who had three players see over 20 minutes of game time off the bench.

Trae Young had his worst-ever shooting night for the Hawks, making one field goal out of 12 attempts, as well as committing six turnovers.

CP3 takes over for Suns

Chris Paul scored 19 points in a brilliant fourth quarter, as the Phoenix Suns secured a 110-99 win over the New Orleans Pelicans.

As the Pelicans cut a 23-point deficit to single digits to two possessions, the Suns needed the 36-year-old, who eventually finish with 30 points, 10 assists, seven rebounds and three steals.

Despite 25 points from CJ McCollum, the Pelicans finished with the unusual statistic of a better three-point field goal percentage (39.1) than total field goal percentage (37.9).