Jaylen Brown was out of his mind in that first half and the Celtics lead 67-45:

Brown: 23 points on 10-13 FG
Jayson Tatum: 10 points, 10 rebounds
Payton Pritchard: 10 points, 7 rebounds, 6 assists
Al Horford: 8 points (3-5 from three), 4 rebounds