LeBron James(notes) and the Cleveland Cavaliers only needed one quarter to elbow their way back into the lead of their Eastern Conference semifinal with the Boston Celtics. James scored 21 of his 38 points in the first quarter to help Cleveland beat Boston 124-95 on Friday night, handing the Celtics their worst home playoff loss ever and taking a 2-1 lead in the best-of-seven Eastern Conference semifinals. “It started with me tonight. Everyone else saw my aggression and took advantage of it,” James said. “I think rest helped me; rest helped all of us, and we were able to put together a complete game for the first time in these playoffs.” Showing no ill-effects of an elbow problem that was the talk of Cleveland during the three-day layoff since a Game 2 loss at home, James finished with eight rebounds and seven assists. The 21 points in a quarter was a franchise postseason record. “I know I’m going to hear a lot about the elbow, but I’m here to play basketball and give our team a chance to win,” James said. “We knew how important it was to come out and play aggressively after giving away Game 2.” http://sports.yahoo.com/nba/recap;_ylt=AvDq0mW9L.S7a0Ovyfckvjm8vLYF?gid=2010050702