The Celtics  have played without the Big Three this season. Kevin Garnett  missed 10 games with a hyperextended knee, Pierce was sidelined for another 10 games with a variety of knee, foot, and thumb ailments, and Ray Allen  sat out a night with back spasms.
But it is perhaps more challenging when one of these players is unexpectedly kept off the court. On Friday, the Celtics intended on having Allen for four quarters against the Rockets. Instead, foul trouble allowed him to play just 16 minutes. He picked up two fouls in the first quarter alone and had five going into the fourth. With 2:13 left in regulation and the Celtics up, 104-101, Allen fouled out for the first time all season.
The Celtics missed their sharpshooter in a loss decided by just five points , 119-114, in overtime.
“Ray was in foul trouble the entire game,” said Doc Rivers . “That hurt us down the stretch, clearly, because it took away so many options and it took away space.”
The outcome could have been different if the Celtics hit free throws, Garnett pointed out. The C’s shot just 65 percent from the line (24-for-37) while the Rockets were a consistent 89.3 percent (25-for-28). Allen, the team’s best free throw shooter at 90.6 percent on the season, made it to the line just once. Because of foul trouble, he was forced to watch his team struggle from the same place he has had so much success.
“Any time you miss Paul or Ray or anybody who is in our starting five, it’s a big blow to us,” said Garnett. “Obviously free throws were a big key tonight. If we make or we only miss about four or five of them, we’d win the game by a pretty decent margin. But every game it’s going to be something. But any time you lose a big piece of your offense or anyone in your starting lineup, it’s a big blow.
“Not having Ray in the game, not just for free throw purposes but for offensive attention, he draws a lot of attention on offense. It gets a lot of guys easy shots and different looks and stuff. And with him not in there was big.”
The Celtics will look forward to having Allen, who is averaging 15.9 points per game, back on the court when they face the Cavaliers  on Sunday.