Celtics' big man Kristaps Porzingis rotated to help and contest Mitchell at the rim. Porzingis jumped and got his arm up, but Mitchell cocked his arm back and slammed the ball down over the seven-footer, which brought the full crowd at Rocket Mortgage FieldHouse to its feet.

Nearly five minutes into the contest, the Cleveland Cavaliers guard attacked the rim after splitting two defenders at the top of the key.

Donovan Mitchell just threw down one of the biggest dunks in years for the Cavs during Tuesday night's game against the Celtics.