(Boston, MA)  --  Al Horford's 15-foot jumper at the buzzer gave the Celtics a 97-96 triumph over the Trail Blazers in Boston.  C.J. McCollum led Portland with 22 points, while Damian Lillard contributed 21.  The Blazers play tonight in Detroit as they conclude this three-game trip.  Portland has lost two in-a-row after a season-best four-game winning streak.