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.
World Series of Poker Tournament of Champions
On March 15, 2010, Harrah's and the World Series of Poker announced that the WSOP Tournament of Champions would return on June 27, 2010 when 27 players competed in a freeroll for $1 million in prize money. The new format is an All-Star Event format, where the public decided which players participated in the event from a list of 521 current WSOP bracelet-holders.