Everything is on track for the San Antonio Spurs. They're staying healthy and coasting toward the home-court advantage they prize in the playoffs. The Dallas Mavericks, meanwhile, are still banged-up and sliding. Tony Parker scored 18 points, DeJuan Blair had 18 points and 13 rebounds, and the Spurs won their fifth in a row while handing the reeling Mavericks their fourth straight loss, 101-89...