Jason Green weighs in with his Dallas Mavericks vs. Portland Trailblazers Friday NBA basketball Preview and a free nba prediction to boot. Tonight the spread favors the Mavs by -2. The over/under is set at 191. Jamal Crawford and J.J. Hickson combined for 57 points in the Blazers most recent win. They along with guards Wesley Matthews and Raymond Felton will have to take up the scoring slack with LaMarcus Aldridge out.