AT THE HALF: Boston 59, Cleveland 49

Boston has a 598-49 halftime lead over Cleveland.

It’s been the Jaylen Brown in the first half, as the Celtics will begin the third quarter with a 59-49 lead.

BOSTON — The Boston Celtics have been one of the NBA’s most explosive teams offensively, which was on display in the first quarter of their semifinal matchup against Cleveland.

But there was one problem.