Jason Green weighs in with his Portland Trailblazers vs. Dallas Mavericks Saturday NBA basketball Preview and a free nba prediction to boot. NBA odds favor the Mavericks by 4.5. The over/under is set at 186.5. The Blazers 0-4 ATS in their last 4 games as an underdog. Dirk Nowitzki has snapped out of his scoring slump recently. Gerald Wallace and LaMarcus Aldridge will be dealing with a good Mavs’ defense.