Foundation of the International Lawn Tennis Federation 1913. Inside the doors at 34 Rue de Provence in Paris, 15 nations become the inaugural members of the International Lawn Tennis Federation (ILTF) at the first general conference in Paris: Australasia, Austria, Belgium, Denmark, France, Germany, Great Britain, Hungary, Italy, Netherlands, Russia, South Africa, Sweden, Switzerland and Spain.
https://www.itftennis.com/en/about-us/organisation/history-of-the-itf