While some of the NFL's biggest names took the field for the Pro Bowl Games at Allegiant Stadium, Rivers tried his luck at Caesars Palace.
Rivers, a former Fresno State Bulldog, won a mega jackpot of $514,837 while playing three card poker at the casino.
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The 24-year-old rookie was in Las Vegas to celebrate his and his mom's birthday
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Players on the winning side of the Pro Bowl walked away with $84,000 each for their efforts in the game.
Rivers won six times more than that.
Officials with the casino say Rivers plans to buy a house with his winnings.