, Var – August 12, 2003) was a French tennis player (left-handed).

He was on the victorious French team at the Davis Cup

Davis Cup

The Davis Cup is the premier international team event in men's tennis. It is run by the International Tennis Federation and is contested between teams of players from competing countries in a knock-out format. The competition began in 1900 as a challenge between Britain and the United States. By...

 four times, in 1929, 1930, 1931, and 1932, although he never played. The members of the team became known as the "Four Musketeers," and Boussus was the "Fifth Musketeer." He finally got his chance to play at the Davis cup in 1934, when the Four Musketeers had retired. http://www.tennis-histoire.com/anecdote-davis.html

He was defeated in the finals of the 1931 French Open

French Open (tennis)

The French Open |Roland Garros]]) is a major tennis tournament held over two weeks between late May and early June in Paris, France, at the Stade Roland Garros. It is the premier clay court tennis tournament in the world and the second of the four annual Grand Slam tournaments – the other three are...

 by Jean Borotra

Jean Borotra

Jean Robert Borotra was a French champion tennis player. He was one of the famous "Four Musketeers" from his country who dominated tennis in the late 1920s and early 1930s.-Career:...

. In 1932, he and Marcel Bernard

Marcel Bernard

Marcel Bernard was a former French male tennis player. He is best remembered for having won the French Championships in 1946. He defeated Jaroslav Drobný in the finals by the score of 3-6, 2-6, 6-1, 6-4, 6-3.In the same French Open , Bernard also won the Men's Doubles with Yvon Petra...

 were defeated in the doubles finals of the French Open by Henri Cochet

Henri Cochet

Henri Jean Cochet was a champion tennis player, one of the famous "Four Musketeers" from France who dominated tennis in the late 1920s and early 1930s....

 and Jacques Brugnon

Jacques Brugnon

Jacques "Toto" Brugnon was a French tennis player, one of the famous "Four Musketeers" from France who dominated tennis in the late 1920s and early 1930s.He was born in Paris and died in Paris....

. He played twice he Australian Championships, in 1928 and 1935, and won the mixed doubles that year, his only Grand Slam title. He also won twice the German championships in Hamburg.

He died at the age of 95, the last surviving Musketeer.