Cleveland Cavaliers players LeBron James holds up the Larry O'Brien Trophy after beating the Golden State Warriors in the NBA Finals game seven at Oracle Arena in Oakland, California, US, June 19, 2016. [Photo/IC]

OAKLAND - LeBron James powered the Cleveland Cavaliers to a 93-89 victory over the Golden State Warriors on Sunday in an electrifying Game Seven to complete an improbable comeback unlike any seen before and capture their first NBA championship.

With the victory over the top-seeded Warriors, who beat Cleveland in last year's championship, the Cavaliers became the first team to rally from a 3-1 series deficit in the best-of-seven NBA Finals and win the title.

"I've had goal for two years since I came back to bring a championship to the city," said an emotional James, who returned to the Cavaliers in 2014 after a four-year stint with Miami that included a pair of NBA championships.

"I gave it everything that I had. I poured my heart, my blood, my sweat and my tears into this game."

James led Cleveland in the championship-clinching with a triple-double as he scored 27 points to go along with 11 rebounds and 11 assists en route to being named the Most Valuable Player of the NBA Finals.

The win ends decades of heartbreak for the city of Cleveland, which had not won a professional sports championship since the 1964 Cleveland Browns of the National Football League.