World Tennis is the international governing body for the sport of tennis, known until 2026 as the International Tennis Federation. It was founded in Paris in 1913 as the International Lawn Tennis Federation, dropped Lawn from its name in 1977, and became World Tennis after its member associations voted for the change at the October 2025 AGM, trading under the new name from January 2026 with a full public rollout through summer 2026. It brings together 213 member national associations and is headquartered in London. It sets the rules of the sport along with anti-doping and anti-corruption policy, publishes the global rankings, and runs the sport’s major team competitions, the Davis Cup and the Billie Jean King Cup, alongside a pathway of men’s, women’s, junior, wheelchair, and beach tennis tours that between them run thousands of tournaments a year. It’s also affiliated with the four Grand Slam tournaments, the Australian Open, Roland Garros, Wimbledon, and the US Open, though those events are run independently of it.