A 21-year-old Michigan poker professional who chose cards over college won the World Series of Poker main event in Las Vegas early Tuesday, winning $8.55 million and becoming the youngest player to win the tournament in its 40-year history. Joe Cada of Shelby Township, Mich., turned over a pair of nines early after 46-year old Darvin Moon called his all-in wager with a suited queen-jack, setting up an about-even race for most of the chips on the table.