World Series of Poker
The World Series of Poker (WSOP) is a series of poker tournaments held annually in Las Vegas and, since 2005, sponsored by Caesars Entertainment Corporation (known as Harrah's Entertainment until 2010). It dates its origins to 1970, when Benny Binion invited seven of the best-known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.
Benny Binion
After years of arranging heads-up matches between high-stakes players, the seed of an idea grew. Binion invited six high-rollers he knew to play in a tournament in 1970. They would compete for cash at the table, after which they would vote on a winner. Johnny Moss, then 63, was voted champion by his younger competition and received a small trophy. The next year, a freeze-out format with a $10,000 buy-in was introduced, and the World Series of Poker was born.