Durant finished with a game-high 30 points, his fourth straight performance with at least that many. He added 11 rebounds and six assists to help the Thunder move to 4-0.
“As a kid, of course you dream about hitting the game-winning shot in the NBA, so it's a dream come true,” Durant said.
The shot was Durant's third buzzer-beating game-winner of his four-plus years. Durant defeated Atlanta on the road as a rookie and stole one from New York in January last season.
“It's special to hit a game-winner,” Durant said. “The season's still young. But to beat the champs is always pretty cool.”
Durant, the reigning two-time scoring champ, appears to be putting together his best start to a season. Through four games, he's averaging 31.2 points on 57.3 percent shooting.
“Right now, he's probably the best player in the league with what he has been doing in the first four games,” said Mavs coach Rick Carlisle.
Durant said, if anything, his mentality has developed.
“I feel more confident in myself,” Durant said. “No matter how bad or how good the game's going, I always want to be positive and tell the guys that things can get better. I think this game is mental, and I'm just trying to change my mental aspect of it and be more of a leader.”