The Association of Tennis Professionals determines the official rankings for men's tennis, while the Women's Tennis Association determines the official rankings for women's tennis. The ATP and WTA are the official governing bodies of tennis.
The ATP and WTA rank players weekly based on a point system that considers players' results in the previous 52 weeks of competition. Though singles rankings are the most prominent, the ATP and WTA also rank doubles pairs.
Players receive points based on their performances and the level of difficulty of each tournament. The Australian Open, French Open, U.S. Open and Wimbledon Championships are weighted the most heavily in the rankings. The rankings consider only a player's best 16 to 18 performances in the 52-week window.