The ATP world tour finals is an indoor hard courts tennis tournament for men, and is held annually in November. Also known as "Masters Cup", this is the most important men's tournament after the Grand Slam. The tournament is different from the other in that it is not a direct competition, but is composed of two "houses", in each one 4 players, and only the winners of each house are opposing each other in the finals. The ATP world tour finals has no set location, and through the years was held in Tokyo, Frankfurt, New York, London, and more. Great tennis players have won over the years, among them you can find Novak Djokovic, who in 2015 is considered number 1 in men's singles tennis, Roger Federer, Pete Sampras and Boris Becker. Buy your Barclays ATP World Tour Finals ticket at Doctorticket and get a chance to watch exciting tennis!