The no-limit Texas Hold 'em main event started Saturday in Las Vegas with registration slightly up on the first of three starting days, with thousands more expected to start Sunday and Monday.
From millionaire card sharks to home-game amateurs, players are staking $10,000 for a shot at millions. Only 10 per cent of those who enter the tournament will win any money.
Canadian poker professional Daniel Negreanu of Toronto says it's a tournament about history, requiring smarts and stamina.
The last nine players will likely play at least 70 hours to reach the final table.