The Celtics  jumped out to an 8-1 lead in the first two minutes in never trailed in the first quarter. It was Ray Allen  — not LeBron James  — who led all players with 10 points. James and Mo Williams  were right behind him with eight points apiece for the Cavs. Both teams shot 50 percent from the field in the first quarter.
Doc Rivers  turned to his bench when Rajon Rondo  picked up two early fouls. First one in: Tony Allen , who is averaging 9.25 points and 3.5 rebounds in the last four games. Interesting move as this left the unit without a true point guard. That didn’t halt the Celtics, though, as they outscored the Cavs, 33-24, after the first 12 minutes.
The Celtics continued to build their lead in the second quarter. They were up, 50-40, with 3:23 left before back-to-back fouls on Ray Allen and Kevin Garnett  allowed the Cavs to chip away at the deficit. They went on a 7-2 run to get back within five. But the Celtics answered with a 5-0 run of their own, propelled by Garnett and Paul Pierce . Rondo drained a 3-pointer as time expired to give the Celtics a 64-49 halftime lead.
Williams leads all players with 15 points. James has 10. Rondo and Ray Allen scored 12 each. The Celtics are 37-17 when leading or tied at the half.