Top NBA teams struggling
While the San Antonio Spurs are soaring, three of the league's foremost contenders are sputtering. This isn't to say they're doomed, but the Indiana Pacers (four straight losses), Miami Heat (three) and Oklahoma City Thunder (two, Sunday's coming against the lowly Los Angeles Lakers) haven't looked so formidable in recent days. Which team's stretch is most worrying? How will each fare come playoff time?