Jason Green weighs in with his Portland Trailblazers vs. Boston Celtics Friday NBA basketball Preview and a free nba prediction to boot. NBA odds favor the Celtics by 3.5. The over/under is set at 184.4. The Celtics are 4-11 ATS in their last 15 games overall, 1-6 ATS in their last 7 games. To win Nicolas Batum, and Jamal Crawford have to help LaMarcus Aldridge out on offense.