Guy, Baron Lejeune played doubles at the 1900 Olympics. Two other results are known for him. In 1901 he lost in the first round of the French Covered Court Championships, and he lost in round two of the Paris International.
|1900 Summer||Paris||Tennis||Men's Doubles||France-2||FRA||5T|
|1900 Summer||Paris||Tennis||France-2||FRA||Ãlie, Count de Lastours||Round One||Match #1||2||FRA-1 2, FRA-2 1||1|