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.
PokerStars Championship
The PokerStars Championship was a series of global poker tournaments which began in 2017. The formation of the series was announced in August 2016, when PokerStars revealed that the European Poker Tour and other poker tours were being rebranded. Seven tournament festivals were played in the inaugural season, in the Bahamas, Panama, Macau, Monte Carlo, Sochi, Barcelona and Prague. PokerStars also announced another series of tournaments, PokerStars Festival, which features lower buy-in events. The series was discontinued after the inaugural season.