The International Tennis Federation (ITF) is the governing body of tennis worldwide, overseeing professional and amateur tennis tournaments, including the Grand Slams.

The Association of Tennis Professionals (ATP) is the governing body of men's professional tennis, organizing tournaments and ranking players.

The Women's Tennis Association (WTA) is the governing body of women's professional tennis, organizing tournaments and ranking players.

The United States Tennis Association (USTA) is the national governing body for tennis in the United States, organizing tournaments and promoting the sport.

The International Tennis Federation (ITF) is responsible for organizing the four Grand Slam tournaments: the Australian Open, French Open, Wimbledon, and US Open.

The International Tennis Federation (ITF) is responsible for organizing the Davis Cup, the international men's team tennis competition.

The International Tennis Federation (ITF) is responsible for organizing the Billie Jean King Cup, the international women's team tennis competition.

The International Tennis Federation (ITF) is responsible for organizing the Hopman Cup, the mixed-gender team tennis competition.

Laver Cup Ltd., a joint venture between Team8 and Tennis Australia, is responsible for organizing the Laver Cup, the men's team tennis competition between Europe and the Rest of the World.

The International Tennis Federation (ITF) is responsible for organizing the United Cup, the mixed-gender team tennis competition.

The Association of Tennis Professionals (ATP) is responsible for organizing the ATP Finals, the year-end championship for the top 8 male singles players and top 8 male doubles teams.

The Women's Tennis Association (WTA) is responsible for organizing the WTA Finals, the year-end championship for the top 8 female singles players and top 8 female doubles teams.

The Association of Tennis Professionals (ATP) is responsible for organizing the Next Gen ATP Finals, the year-end championship for the top 8 male players under the age of 21.

The Women's Tennis Association (WTA) is responsible for organizing the WTA Next Generation Finals, the year-end championship for the top 8 female players under the age of 23.

The International Tennis Federation (ITF) is responsible for organizing the Challenger Tour, the second-tier professional tennis circuit for men and women.