Greg Bunnell has played fantasy football since he was a teenager. So when Indiana legalized sports betting two years ago, the 39-year-old project manager seamlessly switched from plotting his next player transfer to setting himself up to bet-all within the FanDuel app. Bunnell, who says he plans to wager as much as $100 a weekend, is one of a record 45 million Americans expected to legally bet on professional football this season, a 36% increase from last year. Thirty states are set to allow such wagering by the Super Bowl's coin toss in February, following a U.S. Supreme Court decision three years ago to strike down a federal ban on sports betting.
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