The Boston Celtics have dropped two games lately, which isn’t a huge deal, but by their high standards is two losses too many. The Boston Globe (Marc J. Spears) reports: So, what’s wrong with the Celtics now after so much went right? Fatigue is a factor. Entering last night, Boston was the only Eastern Conference team to have played more than 30 games. Center Kendrick Perkins sprained his surgically repaired left shoulder in the first quarter against the Lakers and missed his first game of the season against Golden State. Although the games against the Lakers and Warriors were day-night, back to back, with a short plane ride from Los Angeles to San Francisco, Rivers believes it took its toll on his players, so he gave them yesterday off. “I would have rather had the day off [Friday],” Rivers said. “[The Lakers game] was a hard-fought, emotional game. We didn’t play very well. But it was still hard-fought. It was one of those rare games during the regular season where guys have a lot of emotions invested into the game. I would have much rather had a day off.