Background
Roelof was born on 3 October 1876 to Christiaan van Lennep and his second wife Charlotta Louise Küpfer.
Roelof was born on 3 October 1876 to Christiaan van Lennep and his second wife Charlotta Louise Küpfer.
In 1895 he and his family founded the Hilversumsche Lawn Tennisclub in their own house. Some years after they established three cement courts. In 1910 he regained his national doubles title alongside Gerard Scheurleer.
In 1911 he booked his last national title in the doubles teaming up with Adolf Broese van Groenou.
Next year he was able to defend his doubles titles only losing the singles to Christiaan.