The Celtics established a season high for first-quarter scoring with their opening blitz of the Hawks, outscoring Atlanta by an astounding 39-13.
Their previous high for any quarter was 34 points on Nov. 11 against Miami.
The Celtics shot 72 percent in the quarter and had a 20-0 advantage in points in the paint.
The big question: Would it last? The Celtics started strong against Toronto on Sunday as well, only to lose the game. But they were never up by 26.