The 26-year-old player, who has only seen five minutes of NBA court time this season with the Orlando Magic, wowed the crowd with four perfect 50-point dunks during the game.
In the first round, he jumped over a car that had been parked under the basket with a person holding the ball up through an open sun roof, finishing with a reverse dunk.
His second dunk saw him jump over a standing man and turn in the air.
McClung's third perfect score involved him dunking a ball from a man spinning on a hoverboard, while at the same time dunking a second ball held by a man standing on a ladder.
And the 6ft 2in McClung clinched the title by dunking over 6ft 11in Cleveland Cavaliers player Evan Mobley, who was stood on a small platform.
"Truly, stuff like this doesn't happen without standing on the shoulders of a lot of people," McClung told TNT after beating San Antonio Spurs' Stephon Castle in the final round.
"I had a lot of help. People were opening gyms to fit a car in. People were allowing me to use their car. I'm just really grateful right now."
McClung plays the majority of his basketball in the G League, the NBA's developmental league, and was last season named its most valuable player.
He has played just five NBA games in his career, for the Los Angeles Lakers, Chicago Bulls, Philadelphia 76ers and the Magic.