Toronto Raptors guard Terrence Ross won the NBA’s Slam Dunk Contest with a one-handed, through-the-legs rim-rattler after leaping over a ballboy.

The windmill slam earned the wild applause of the sold-out crowd at the Toyota Center and lifted the 22-year-old rookie to the title over Jeremy Evans of the Utah Jazz.

“I feel blessed, but it’s still overwhelming,” he told reporters. “I’m just trying to soak it all in.”

Ross gained 58 per cent of the votes from the public in the two-dunk championship round to claim the title.

In another skills test, Kyrie Irving, of the Cleveland Cavaliers, defeated San Antonio Spurs power forward Matt Bonner 23-20 to win the three-point shooting contest.

Ross said he never dreamed he would win the title.

“It was my favourite event to watch every year, since I was a small child,” he said. “But actually winning it, I never thought I’d do it. It’s been unbelievable. I’ve had fun.”

In the opening round of the finals, Evans leapt over a covered easel and delivered a left-handed windmill slam. After the dunk, he pulled the cover off the easel and revealed a picture of himself dunking the ball.

He then signed the picture to the roar of the crowd.

But Ross clinched the competition with his gravity-defying leap over the ballboy, who also needed a leap of faith that he was not going to get clobbered.

“I told him the day before that I was going to jump over him, but I never told him I was going to go through the legs,” said Ross. “He was kind of nervous.”