The Sixers can thank Boston-area native Michael Carter-Williams.
The rookie point guard finished with 24 points, six assists, and six rebounds in his homecoming. He did some of his damage after the Celtics closed the gap to three points (89-86) with 6 minutes, 4 seconds remaining.
The 6-foot-6, 185-pounder responded with a layup seven seconds later. Then after stripping Phil Pressley on the ensuing possession, Carter-Williams hit a jump shot. He also scored the Sixers next three points on a jumper and a foul shot to give them a 96-90 lead with 3:29 left.
Following his lead, Young (15 points) scored the next two baskets before Elliot Williams' dunk gave the Sixers a 102-92 cushion.
"As a leader on this team, and the freedom that I have to take shots, I'm going to be expected to make some," Carter-Williams said, "and tonight that's what I did."
But for the most part, this game featured a different cast of characters from the teams' last visit to TD Garden.
Evan Turner, who made a game-winning buzzer-beater on Jan. 29, was traded to the Indiana Pacers on Feb. 20. So was reserve Lavoy Allen. The Sixers also traded Spencer Hawes to Cleveland.
Boston's Rajon Rondo played in Friday's game. He sat out the Sixers previous game here because it was the second of the Celtics games on back-to-back nights. The former all-star is coming off an anterior cruciate ligament tear he suffered last season.
The 6-foot-1 point guard recorded his second triple-double in three games played. This time, he finished with 11 points, 16 assists, and 11 rebounds.
Carter-Williams wasn't the only Sixer making a homecoming.
Rookie center Nerlens Noel is from nearby Everett, Mass. Sixers coach Brett Brown played at Boston University and is from South Portland, Maine.
"I just get flooded with memories of so many things," Brown said of his return to Boston.
Brown recalled his days as a high school standout playing in a Boston tournament. He also talked about his family roads trip to watch the Celtics play at the old Boston Garden. And he mentioned his time at Boston University.
"I'm fond of the fantastic memories that I had in this city," Brown said.
Of the three, Carter-Williams received the most love in Beantown.
The point guard had about 150 well-wishers in the stands. His mother, Mandy Carter-Zegarowski, was interviewed for local TV.
Sixers center Henry Sims had a career-high 24 points."We are on a roll," Brown jokingly said of the Sixers winning two of their last four games.