Then Donovan ... Mitchell found some space and drove to the paint, where Celtics forward Kristaps Porzingis was waiting.

And what better way to put the attention back on the court than a primetime matchup between the Eastern Conference's top two ...

Mitchell, a former NBA Slam Dunk champion, put a jolt into the arena with a thunderous poster slam over Celtics center Kristaps Porzingis, who already had two blocks in the contest.