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Top Sports for Illegal Wagers

Illegal wagers: $6-$10 billion

Of the total wagered illegally on football each year, roughly 10 percent is spent on the Super Bowl.

"The Super Bowl has become an American national holiday — a betting holiday," Root says. "That is why it is the most-watched television event of each year. Take away the money, and it's just another sporting event. But with $6 to $10 billion changing hands, it's a life-changing event. The NFL is definitely the king of gambling and the Super Bowl is the crowning event of the football season."