A grand patron of the game and an enthusiastic player into his 90s, King Gustav V of Sweden learned to play during a visit to Britain in 1878, and founded his country's first tennis club on his return home. In 1936 he founded the King's Club. Eventually disbanded during the open era, it was a men's indoor team competition for European countries. He became king on December 8, 1907, ruled for 43 years and was often seen playing friendly events on the Riviera.

Entered under the pseudonym, Mr. G., looking like an aged Mr. Chips in spectacles, white mustache, flannels and straw hat, he frequently took part in handicap tourneys, partnered by famous players such as Suzanne Lenglen. During World War II this widely respected ruler interceded to obtain better treatment for the Nazi-imprisoned Davis Cup stars, Jean Borotra of France and Gottfried von Cramm of Germany, and may have saved their lives.

Gustav was born June 16, 1858, in Drottiningholm, Sweden and died October 29, 1950. He was elected to the Hall of Fame in 1980.