The Celtics built off a strong finish to the first quarter to post a 24-6 run midway through the second quarter. They are led by Paul Pierce's 15 points on 5-13 shooting.
Coming off a 44-point performance in game two, Rajon Rondo has tempered himself with just six first-half points and seven assists, playing the more customary role of distributor.
After a hot start (16 points in the first quarter), LeBron James has cooled off with just four second-quarter points. He'll also need to watch himself coming out of the locker room as he's playing with three personal fouls.
Aside from the early transition baskets Miami got early in this game, the Celtics defense has been exceptional.
As our own Mike Prada pointed out, the Cetlics are being successful with a strongside zone defense that is designed to take away isolation sets -- something the Heat are conditioned to with with James and Dwyane Wade. Because the Celtics are scoring with alacrity, the Heat are being forced into half court sets, and aside from James, they have struggled to get good looks at the hoop.