The ATP is the governing body of the men's professional tennis circuits - the ATP World Tour, the ATP Challenger Tour and the ATP Champions Tour. With 64 tournaments in 31 countries, the ATP World Tour showcases the finest male athletes competing in the world’s most exciting venues. From Australia to Europe and the Americas to Asia, the stars of the 2018 ATP World Tour will battle for prestigious titles and ATP Rankings points at ATP World Tour Masters 1000, 500 and 250 events, as well as Grand Slams (non ATP events). At the end of the season only the world’s top 8 qualified singles players and doubles teams will qualify to compete for the last title of the season at the Nitto ATP Finals. Held at The O2 in London, the event will officially crown the 2018 ATP World Tour No. 1.