The Celtics have some problems, as their opening night loss to the Miami Heat made clear. One of those problems involves having far more quality guards than Doc Rivers can fit in his rotation, although that is the problem the coach is least likely to complain about. A quiet bench was due to join the listless defense and directionless offense as culprits in Boston's loss on Tuesday before Leandro Barbosa started the fourth quarter and nearly changed everything. Barbosa, who also started the second quarter but went scoreless in four minutes, hit his first six shots and dropped 16 points to turn a 19-point deficit into four points. The Heat never really slowed him down and Barbosa never actually cooled off, but the Celtics had dug themselves in too deep for a comeback to be realistic. "If you get into a scoring contest and Barbosa's on the floor, you're going to feel pretty good about it," Rivers said. "That's how he's played. That's how he's used to playing. I love the way he attacks. He's clearly not scared of the moment. He bailed us out. We got back in that game down the stretch and it was because Barbosa was on the floor." Jason Terry only got off the bench for six minutes in the final quarter because Barbosa was playing too well for Rivers to mess with success. Terry and Barbosa give the Celtics two former NBA Sixth Man of the Year award winners on their bench, and the combination could be intriguing -- if Rivers did not also have to figure out how to work in Courtney Lee and, eventually, Avery Bradley. That may be a problem Rivers will welcome, considering all the other things he has to worry about in the coming weeks, but it is still a sensitive situation, especially if every player continues to play well. RAGE-ON RONDO If Rajon Rondo seemed a bit, um, perturbed at times, the Celtics' wide deficit may have had something to do with it. Merely losing is not enough to set off the young point guard, though, usually. Typically there is something more going on, be it involving the officials or the other team. As it turned out, that something was neither the opponent nor the referees, according to Rivers. The frustration may have stemmed from Rondo's own teammates. "Rondo was a little frustrated because he was running plays to get to the second or third option and no one was executing," Rivers said. "When you're the point guard and the guys are in the wrong spot all game, that gets frustrating."

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