Brook Lopez is among the most efficient scorers in the NBA. He averages 18.7 points on only 14.2 shots, the second-lowest average among the league's top 25 scorers. And he's going to have to be more efficient. In the last three games, he's averaging only 10 shots. But that's not what's frustrating him. Nor are the calls... really. Losing is tough, but Lopez says it's mostly his own performance that's been frustrating.