The Golden State Warriors earned their third NBA title in four seasons after completing a comprehensive 4-0 series win over the Cleveland Cavaliers.
Coach Steve Kerr described the triumph as "the hardest so far" but his Warriors side routed the Cavs 108-84 to prevail in the fourth consecutive finals meeting between the teams.
Stephen Curry scored 37 points for the Warriors, while LeBron James claimed 23 in what could be his final Cavs game.
James is a free agent next month.
The 33-year-old American, playing in his eighth consecutive finals, said he had "no idea at this point" about his future and would consider the decision with his family.
'We just know how to win'
The win added to the Golden State Warriors' victories in 2015 and 2017 and was the first finals clean sweep since the Cavs were demolished by San Antonio Spurs in 2007.
It was the second time the Warriors have secured the championship in Cleveland during Kerr's four-year tenure.
"I remember sitting in this room three years ago and it seemed like a dream. This feels like reality," Kerr said. "I hope that doesn't sound arrogant. It's just the talent we have and the experience we've gained."
The three-time champion revealed he had played the last three matches with a broken right hand, sustained after he scored his best play-off points haul of 51 in the opener.
The Cavs' talisman reportedly suffered the injury after punching a blackboard in frustration after his side spurned an opportunity to win in the final seconds.
"It was self-inflicted," he said. "I was very emotional for a lot of different reasons and I let that get the best of me."
On the night, James top scored for his side and left to a standing ovation after playing 41 of the game's first 44 minutes, but it was his least productive performance of the series.
"To be the best player in the world and to give everything you've got in your 15th season, play all 82 games and carry this team the way he did is a testament to his character," Lue said.
"He's a bad boy and I love having him on our team. He fights and competes to the end. Sometimes you can give everything you've got and still come up short.
"I hope he stays. But after a game like that I'm not in any position to talk about that."