The 2005 World Series of Poker opened play on June 2, continuing through the Main Event No Limit World Championship starting on July 7. The conclusion of the Main Event on July 15 marked the close of play, and the largest prize in sports and/or television history at the time ($7,500,000) was awarded to the winner. ESPN's broadcast began July 19th with coverage of WSOP Circuit Tournaments, and coverage of the Main Event began October 11th and ended November 15th.

The World Series of Poker (WSOP) is a series of poker tournaments held annually in Paradise, Nevada and, since 2004, sponsored by Caesars Entertainment. 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.