Louis Mermillod was second in the Swiss sprint championship in 1915. After World War I he won the Swiss sprint title in both 1924-25, also competing at the World Championships in 1925. In 1932-33 he became a member of the board of the Genève Bicycle Club, becoming President in 1935. In those years he ran a bicycle shop in Genève.
|1924 Summer||Paris||Cycling||Men's Sprint||Switzerland||SUI||3 h3 r5/6|
|1924 Summer||Paris||Cycling||Switzerland||Semi-Finals||Heat Three||3|
|1924 Summer||Paris||Cycling||Switzerland||Quarter-Finals Repêchage||Heat Two||1||QU|
|1924 Summer||Paris||Cycling||Switzerland||Quarter-Finals||Heat Five||2||QC|
|1924 Summer||Paris||Cycling||Switzerland||Round One Repêchage||Heat Four||1||QU|
|1924 Summer||Paris||Cycling||Switzerland||Round One||Heat Nine||2||QC|