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.
Poker tournament
The largest and most well-known tournament in the USA is the World Series of Poker, held in Las Vegas. The World Series has traditionally been featured on ESPN. In the 1980s the Super Bowl of Poker was the second largest and most prestigious tournament.