The Celtics  held the Heat to nine first-quarter points, and Ray Allen  nailed a clutch 3-point shot to snap a late 10-0 Miami run and push the Celtics’ lead back to six in the final minute. Allen’s shot from the corner ended any Heat visions of a comeback from a 19-point deficit, and allowed Boston to claim an 88-80 opening-night win.
THREE THINGS THAT WENT RIGHT
1. Rondo to Shaq: Just four minutes into Tuesday night’s game, Rajon Rondo  drove, drew three defenders and lobbed the ball to Shaquille O’Neal , who threw it down with ease. It was more than just two points.
Obviously, Shaq takes up a ton of space around the basket, which means Rondo has a larger area to which he can toss the ball without fearing interference. That’s could translate into a heckuva lot more assists for Rondo and a heckuva lot of easy buckets for Shaq this season.
In almost 12 first-half minutes, the Big Shamrock finished with six points but would have had 10 if not for a pair of missed bunnies.
The Rondo-to-Shaq combo also exposed the Heat’s biggest weaknesses: the point guard and center spots. The two Celtics simply owned Heat starters Carlos Arroyo  and Joel Anthony . Many critics had serious concerns about “The Others” in Miami, and, for now, those apprehensions appear legit.
2. Interior Defense: The Celtics held the Heat to 12 first-half points in the paint on just 6-of-16 shooting. What’s more, the C’s grabbed 21 first-half defensive rebounds, allowing only two second-chance points en route to a 45-30 lead at the half.
Shaq and Rondo’s dominance of Arroyo and Anthony extended beyond the offensive end. Not worried about their defensive assignments (Arroyo/Anthony combined for two first-half shots), the Celtics duo could sag off and help out on Miami’s trio of stars.
3. Ray Allen: With all the talk about how Garnett looks as healthy as he’s been since arriving in Boston and how Pierce showed up in terrific shape, it was easy to forget to mention Allen.
Maybe it’s because Allen always looks as though he’s in top shape, but the C’s shooting guard looked like he was in midseason form on Tuesday, scoring 20 points on 7-of-13 shooting (including 5-of-8 from downtown). His final 3-pointer of the night came with 50 seconds remaining. It snapped a 10-point Heat run that had cut the lead to 83-80 in the waning minutes.
Allen also did a nice job keeping up with Wade on the defensive end, limiting the Heat guard to 13 points on 4-of-16 shooting.
THREE THINGS THAT WENT WRONG
1. Apparently, Standing in the Way of LeBron James: Twice — once in each half — Pierce appeared to draw a charge on LeBron, who was barreling down the lane, shoulder lowered, towards the basket. And twice referees called Pierce for the blocking foul.
On the second foul, Pierce came down hard on his lower back. He limped to the sideline as the Celtics called timeout, and then went to the locker room clutching his side behind trainer Ed Lacerte.
A report came down that Pierce was out of the game with back spasms — return unknown. But he did return, finishing the night with 19 points.
Celtics head coach Doc Rivers  was none too happy with both blocking calls and let the refs know his frustration.
2. Lacking a Killers’ Mentality: The Celtics led, 63-50, with two minutes remaining in the third quarter. The C’s had their chances to end the game then and there, but instead saw their lead dwindle as they settled for jump shots. Meanwhile, the Heat closed the quarter on a 7-0 run (thanks to four points from LeBron), cutting the gap to a manageable 63-57 deficit heading into the fourth quarter.
Likewise, in the fourth quarter, the Celtics held an 83-70 advantage with four minutes remaining. A few ill-advised shots taken too early in the shot clock led to a 10-point Heat run over the next three minutes that would’ve been 13 if not for a missed wide-open 3-pointer by LeBron.
3. Perimeter Defense: While the Celtics’ inability to get out on the wings defensively didn’t hurt them in the first half, the Heat got plenty of wide-open looks. Eddie House  and James Jones  missed a string of 3-point attempts in the first quarter. But Celtics fans likely understood that House wasn’t going to keep missing those.
In the second half, House and Jones — along with LeBron — finished 5-of-11 from beyond the arc.