David Oancea grew up in Pearl City, and spent some time in Michigan before moving to Las Vegas 15 years ago.
That's where he's hit it big, but it wasn't overnight.
Oancea, or "Vegas Dave" as he's better known, has made a name for himself as a big -- and frequent -- winner on sports bets.
"Miesha Tate. That was the biggest wager in MMA (mixed martial arts) history: $77,000 to cash out $300,000," he said, of his most recent wager on UFC 196 last weekend.
Oancea said he saw the upset coming all along.
"I'm just very good at predicting who's going to be there at the end of the road, end of the year. I'm just good at that," he said.
Oancea banked $2.3 million after the Broncos won the Super Bowl, and $2.5 million when the Royals won the World Series.
The key to his success? Hard work, relatively speaking.
"I have seven TVs at the house, a sports book. I just watch all the games, know all the players. I know all the teams," he said.
Oancea says he doesn't bet frequently, and mostly plays "futures" or long term bets.
He admits, it's taken a lot to get to where he is. Shortly after moving to Vegas, he found himself broke, and in Gamblers Anonymous.
"I really didn't have a gambling problem, I was good at picking winners," he said. "The problem was I couldn't manage my money, I had no discipline."
He found the discipline, and soon after, the wins -- and winnings -- started piling up.
Copyright 2016 Hawaii News Now. All rights reserved.
PHOTOS: Maui crossfitters break a sweat to help sick children
This $14.5M Big Island estate named HGTV's Best Outdoor Retreat
PHOTOS: Former President Bill Clinton on Oahu
PHOTOS: Largest collection of Niihau shell lei, items from Hawaiian heiress up for auction