The BNP Paribas Masters is an annual tennis tournament for male professional players held in Paris, France. It is played indoors at the Palais Omnisports de Paris-Bercy. The event is part of the ATP Masters Series on the Association of Tennis Professionals (ATP) Tour. Many people consider the Paris Masters to be the world's most prestigious indoor tennis tournament. The event is usually the final tournament on the tour before the season-ending Tennis Masters Cup. Because of its sponsorship, the event is officially known as the BNP Paribas Masters. Prior to the establishment of the Tennis Masters Series in the early-1990s, the event was known as the Paris Open. It is also often referred to as the Paris Indoor event.