Both players averaged 20-plus points on the season, and their losses left Joel Embiid to carry the load on Saturday night (Sunday AEDT).
The big centre led the scoring for the home team with 32 points, but he gave the Sixers a scare with 5:33 left in the game when he tripped over fallen teammate Georges Niang and crumbled to the court.
Embiid appeared to roll his left ankle and lay on his back as he was checked out by a trainer.
Embiid hobbled to the bench but stayed in the game.
Young had 33 points and 12 assists, De'Andre Hunter added 22 points and Clint Capela had 18 points and 14 rebounds for the Hawks.
While Young was taking the inbound pass with 3.8 seconds to go and the score tied at 122-all, Griffin had the awareness to run behind the defence and set up near the basket.