(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.