Queensland brothers Jett and Hunter Lawrence have finished first and second after dominating the Super-Motocross World Championship.

It is Jett's third consecutive super-motocross championship win, securing him $US1 million ($AU1.5 million) in prize money, while Hunter's second place netted him $US500,000 ($AU758,000).

The three-round series was raced by the best indoor and outdoor riders from around the world on a hybrid-style track, which concluded at its final stop at Las Vegas on Sunday.

Jett, 22, said it was a challenging weekend after winning the first race of the day and finishing second in race two.

"[In] the first moto, I was able to dig deep and get the win — it saved me for sure," he said.

"In the second moto, I got another bad start and the boys were riding well. Hunter ro

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