BOSTON — The Celtics got a little sloppy after grabbing a 10-point lead in the fourth quarter, but Jaylen Brown had a monster finish to a monster game, leading Boston past Phoenix 120-112.

Box Score

Game Flow

The teams traded runs to start the quarter, with Phoenix starting strong, Boston answering, the Suns punching back, and then Boston making it a back-and-forth finish. Jaylen Brown took 10 free throws in the quarter and scored 11 points, but the Celtics defense gave up 32 points to go into the second quarter down one.

Derrick White got blistering hot to start the quarter, scoring 13 of Boston’s first 16 points. Boston was on fire from three, hitting eight of their first nine to build a nine-point lead. Devin Booker got going late in the quarter, though, to cut into Boston’s cushion and cut it to four at halftime.

Booker kept the Suns close in the third by scoring 16 of Phoenix’s 25 points.…