He competed in water polo at the 1900, 1912 and 1920 Summer Olympics and finished in third, fifth and ninth place, respectively.

At the 1906 and 1920 Games he took part in the 4 × 200 m, 400 m and one mile swimming events, but failed to reach the finals.

[1][2] Vasseur is the youngest Olympic bronze medalist in water polo.

On 12 August 1900, he won an Olympic bronze medal at the age of 15 years and 306 days.

This biographical article relating to a French water polo figure is a stub.