Check the injury report here, as there's a chance Jayson Tatum won't make the post for the Celtics after he missed Monday's loss at Orlando with illness. There's another reason to like "under" here with the Celtics off of a rare loss; in games following their previous six defeats, Boston is allowing only 102 ppg, consistent with overall good defensive numbers this season. Boston enters Christmas on a 6-0 "under" run and has been trending that way a while longer, now 10-4 "under" across the past fourteen games since Thanksgiving week. Meanwhile, the Sixers are 13-7-1 "under" since early November. Play Sixers-Celtics "Under"