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America's 10 Youngest Billionaires

Lorenzo Fertitta

Net Worth: $1 billion
Source: Casinos, Ultimate Fighting Championship
Age: 41

Fertitta returns to billionaire status thanks to growing martial arts league Ultimate Fighting Championship, which he owns with his older brother Frank. Abu Dhabi investment is helping UFC go international. A scuba diver, he swims with sharks--including tigers and great whites--for fun.

(AP Photo/Eric Jamison)

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