Leon Powe  and Tony Allen  combined for 21 points and seven rebounds against their old team, and the Celtics  fell a full game behind the Bulls in the race for the Eastern Conference’s No. 1 seed after a 90-87 loss to the Grizzlies  (40-32) Wednesday night at the Garden.
Rajon Rondo  missed 10 of his 12 shots from the field — including what would have been the go-ahead runner with 19 seconds left — but managed 11 assists and 11 rebounds for the Celtics (50-20). The C’s had two more chances to tie the game trailing 90-87 with 13 seconds remaining, but the first attempt ended up in a Glen Davis  missed a 3-pointer. Memphis’ Marc Gasol missed both free throws on the other end, and Paul Pierce  (game-high 22 points) had a chance for a triple — but that fell short, too.
WHAT WENT WRONG
Slow shooting start: The Celtics shot just 5-of-15 (0-for-2 from 3-point range) from the field in the first quarter, and the Big Four were to blame, making only 2-of-11 attempts. In fact, Tony Allen had more points in the opening 12 minutes as Pierce and Ray Allen  combined. Of course, anybody with two points could’ve made that claim. As a result, the Celtics trailed 20-15 and found themselves once again playing from behind in the early going.
Leon Powe: Prior to the game, Doc Rivers  said the Celtics had interest in Powe as a buyout option, but hesitated based on the condition of his knee. Well, the knee appeared just fine against the C’s, as Powe (at one point) led all scorers on Wednesday. He finished with 13 points.
Taking care of the ball: The Celtics committed 20 turnovers — leading to 16 Grizzlies’ points — and the biggest culprit was their center, Nenad Krstic . After a 2-for-2 start from the field, it wasn’t a good night for Krstic overall. The C’s big man committed four of those turnovers, missed his final four shots and committed more fouls (5) than he grabbed rebounds (2).
WHAT WENT RIGHT
Rajon Rondo attacking the basket: With the Celtics falling behind by 10 early in the second quarter, Rondo sliced to the basket, took on a defender and wrapped a layup underneath him. The C’s closed out the half on a 21-10 run that included a nice give-and-go between Rondo and Delonte West , a nifty Rondo pick that resulted in an and-one for Glen Davis, and a heads-up play in which Rondo fired a ball off a Grizzly to prevent a turnover.
At the break, Rondo had already accumulated six points, six rebounds, five assists and three steals, prompting some early triple-double whispers throughout the Garden.
Free-throw shooting: Entering the game, the Celtics ranked in the middle of the pack (16th) in terms of team free-throw percentage (76.4), but they’ve picked it up of late, shooting a combined 63-of-78 (80.8 percent) in their last three victories. Wednesday night was no different, as the Celtics made 22-of-23 free-throw attempts (95.7 percent) in defeat.
3-point shooting … until the final seconds: After starting 0-for-2 from beyond the arc, the Celtics made seven of their next 11 longballs. Two back-to-back treys from Allen in the second quarter helped the Celtics draw within two points. And a Pierce triple late in the fourth quarter brought the C’s within one at 86-85 with three minutes remaining in the game. But the Celtics missed those two game-tying attempts in the final 13 seconds.