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LAS VEGAS -- A 23-year-old poker professional from Las Vegas by way of Michigan has won the World Series of Poker main event, lasting roughly 3 1/2 hours in a dramatic card session to push past his last opponent for the $8.4 million title.

Ryan Riess emerged with the title late Tuesday after a session that proved a showcase for his skills amid the unpredictability of no-limit Texas Hold 'em.

Riess put his final opponent Jay Farber all-in with an Ace-King.