Boston (AP) - Al Horford had 24 points and 12 rebounds and the Boston Celtics overcame Khris Middleton's long 3 that beat the fourth-quarter buzzer, topping the Milwaukee Bucks 113-107 in overtime to open their playoff matchup.
The Celtics led 99-96 with 0.5 seconds left in regulation when Middleton took an inbounds pass on the far right wing and hit a contested 35-footer to force OT.
Terry Rozier added 23 points, four rebounds and three assists for Boston in his first career playoff start. Jaylen Brown finished with 20 points. Rookie Jayson Tatum added 19 points and 10 rebounds.
Giannis Antetokounmpo led the Bucks with 35 points, 13 rebounds and seven assists before fouling out in overtime. Middleton had 31 points, eight rebounds and six assists. Malcolm Brogdon scored all 16 of his points after halftime for Milwaukee.
Game 2 in the best-of-seven series is Tuesday night in Boston.
An acrobatic, spinning layup by Tatum gave Boston a 108-105 lead in overtime.
It was 108-106 when Horford snared a rebound and got it ahead to Rozier, who was fouled. He made two free throws to put the Celtics in front 110-106 with 18.8 remaining.
Antetokounmpo made one of two foul shots with 14.8 seconds left, but he fouled out of the game while going for the rebound on his miss.
Rozier added three free throws to provide the final margin. Game two is Tuesday in Boston.