There were bad signs all around for the Celtics  when they went to Toronto to play the Raptors. First, it was an afternoon game and the C’s have had well-documented issues playing in the daylight hours. Second, and most importantly, Rajon Rondo  was held out of the game (and is questionable for Monday’s game with the Hawks) because of a strained left hamstring.
Nate Robinson  played well in his absence, but the Celtics struggled to find any kind of consistency on offense and that’s Rondo’s department. The Celtics actually had a lead late in the game, but Ray Allen  lost control of the ball and Amir Johnson made two free throws with 2.7 seconds left to secure the 102-101 victory for the Raptors.
The Celtics had won eight straight against Toronto and were 11-1 against them since Kevin Garnett  and Ray Allen arrived.
WHAT WENT WRONG
Interior defense: Where did it go? The Celtics are one of the best teams in the league at defending the paint, but without a big-time shot blocker they are dependent on stopping dribble penetration and playing their usual strong help-side defense. Glen Davis ‘ ability to take charges is a huge benefit as well. None of that was on display against the Raptors.
Foul trouble: Shaquille O’Neal  picked up his third foul after only eight minutes. Davis had three before halftime and Semih Erden picked up four first-half fouls. In the third quarter, Paul Pierce  and Garnett also picked up their fourth fouls. The Raptors went on an 11-1 run against the Celtics makeshift lineup.
Andrea Bargnani happened: The former No. 1 pick has had a much-maligned career with the Raptors, but he showed up big against the Celtics. Always a threat from long range, Bargnani put the ball on the floor and attacked the Celtics defense. He not only scored 29 points, he also got to the free throw line 13 times and put the entire Celtics frontcourt in foul trouble.
WHAT WENT RIGHT
Nate Robinson: With Rondo out, Doc Rivers  elected to start Robinson instead of Delonte West  at the point. Robinson has struggled at times this season, but he was reborn playing with the starters. Robinson started hot and stayed that way. He scored 16 points in the first quarter and did an effective job of pushing the pace. The Celtics play differently with Robinson in the lineup, but he did the job.
KG in the post: The Celtics want Garnett to be more aggressive with his offense, which is nothing new. He’s one of the best perimeter shooting big men in the game and while that is a great skill, he sometimes settles for the 20-footer too much. Against the Raptors, who have no inside presence, Garnett went to the post-up game and was successful in the second quarter. They did it again in the fourth quarter when the Celtics were making their run.
Defense in the fourth: The Celtics played almost no defense in the first half, allowing the Raptors to shoot 55 percent and drive to the basket at will. They began to tighten up in the third quarter and then really put the hammer down in the fourth. They did the same thing Friday night, which is not a great omen. They consistency has just not been there.