Check the injury report on Jayson Tatum, who might not make the post for the Celtics after he missed Monday's loss at Orlando with illness. But 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, and under in five of those. Boston also 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