The Boston Herald (Mark Murphy) reports: The Celtics are now a remarkable 36-1 against sub-.500 teams, which goes a long way toward explaining why they have the best record in basketball. “We play for ourselves, not other teams,” said Kevin Garnett. “That’s what (coach) Doc Rivers says to us. That comes to life when we play teams that don’t have any significance. “We tend to not play to the competition’s level, because we are playing for the postseason. We must experience the reps. If we go in thinking we have to take care of business, and give other players the chance to play, we need nothing more and nothing less.”