What is the name of the men's team competition founded in 1900?

The men’s team competition founded in 1900 is the Davis Cup.

The event began as the International Lawn Tennis Challenge, created after American and British players developed the idea of a national team contest. The inaugural tie was held in 1900 at the Longwood Cricket Club in Boston, where the United States defeated Great Britain, then competing as the British Isles. Dwight F. Davis donated the trophy and helped establish the competition’s format, which led to its better-known name.

The Davis Cup is organized by the International Tennis Federation and represents countries rather than individual players competing only for themselves. Its traditional ties have included singles and doubles rubbers, although the structure has changed over time. The United Cup is a newer mixed-gender team event, the Hopman Cup features mixed teams in a different format, and the Laver Cup is a much more recent Europe-versus-World competition. The Davis Cup therefore has both the correct founding date and the correct men’s team identity.