The Celtics came back from 20 points down, but Giannis Antetokounmpo's tip-in with 5.1 seconds remaining lifted the Bucks to a 104-102 victory against the Celtics Sunday in Milwaukee.

Jayson Tatum put the Celtics up 100-99 -- their first lead since they were up 14-13 in the first quarter -- by knocking down a pull-up jumper over Khris Middleton with :52 seconds remaining.

Malcolm Brogdon responded by hitting a three-pointer from the right corner, putting the Bucks ahead 102-100 with 33.5 seconds left.

Al Horford tied the game by hitting a pair of free throws after he was fouled by Thon Maker while going up for a dunk.

Brogdon tried to put Milwaukee back in front with a left-handed layup over Horford. It hit the rim but Antetokounmpo was there to tip it in with 5.1 seconds remaining.

Tatum inbounded the ball to Marcus Morris, who missed a contested jump shot as the final buzzer sounded.

Jaylen Brown was Boston's best player on offense, scoring 34 points -- a new playoff career-high -- on 13-of-24 shooting.

Tatum was held to three points in the first half, but came alive during the final 24 minutes to finish the game with 21.

Terry Rozier added 10 points, while Horford and Morris each chipped in 13.

Antetokounmpo scored a team-high 27 points on 60 percent shooting. Middleton went for 23, and Jabari Parker added 16.

The home team has won every game in the first-round playoff series between the Celtics and Bucks.

The series -- once led by the Celtics two games to none -- is now tied at two games apiece as it heads back to Boston for game five on Tuesday night.