BOSTON (AP) — The Bucks exploited gaps in the Celtics’ defense on their way to beating Boston in five games last season in the Eastern Conference semifinals.

The Celtics used a balanced, barrage of offense to return the favor in their first matchup this season.

Kemba Walker had 21 of his 32 points in the second half and Boston rallied to beat Milwaukee 116-105 on Wednesday night.

Jayson Tatum added 25 points, Gordon Hayward had 21 points and 10 rebounds, and Marcus Smart finished with 19 points and six assists. Boston shot 54% from the field over the final two quarters.

“We’ve got so many talented guys on this team everybody should be chipping in to be the team we want to be,” Tatum said.

Milwaukee dominated in the first half, leading by 19 at one point. But the Celtics responded in the third quarter, using a 26-7 run over the final 6:38 of the period to take an 80-76 edge into the fourth.

“They got going pretty good,” Bucks coach Mike Budenholzer said. “Kemba’s a great player, but they played through Hayward a little bit. Tatum made some big shots, tough shots. They mixed and matched well — those three tonight.”

Boston kept that momentum, beginning the final period with an 11-4 run to open a 91-80 lead.

“I think it started on the defensive end,” Hayward said. “We kept getting stops, our energy picked up and that kind of turned it around for us in the second half.”

Khris Middleton led the Bucks with 26 points. Giannis Antetokounmpo had 22 points and 14 rebounds, but the reigning MVP lost his composure late, first picking up a hard foul on Smart and then a technical foul in the final minute.

Antetokounmpo said there was no malicious intent on the play with Smart.

“Nothing,” Antetokounmpo said. “I tried to go for the rebound. He tried to go for the rebound. Two guys that play hard and we both ended up on the floor.”

The Celtics started Daniel Theis at center and the defensive-minded Smart at guard with Jaylen Brown out with an illness and Enes Kanter sidelined for the third straight game with a bruised left knee.

It did little to stop the much bigger Bucks front line early on as Milwaukee sliced through Boston’s interior and hit nine 3-pointers on their way to a 58-42 halftime lead.