Ooms rowed for Neptune Rowing Club, Amsterdam, and was trained by Rudolf Meurer who also trained the Olympic champions François Brandt and Roelof Klein. In 1886, a group of interested sportsmen established a regatta in Amsterdam after meeting at the café Suisse "to establish the “Committee for the Championships of the Netherlands for gentlemen amateurs in single scull outriggers".
One year later, in 1892, Ooms became the first competitor from outside the United Kingdom to win the Diamond Challenge Sculls at Henley. On his return to Amsterdam he was greeted by huge crowds and a fireworks display.
After Ooms' victory, the Dutch Rowing Club awarded him a Golden Belt with the figure of a rower on it. In 1921 he passed this on to the next Dutch rower to win the Diamond Challenge Sculls Frits Eijken.
- International Rowing Regatta Amsterdam
- Encyclopédie des sports. Volume 4 / sous la direction de Philippe Daryl, 1895, p.205.
- Henley Royal Regatta Results of Final Races 1839–1939 Archived 9 March 2012 at the Wayback Machine
- Forgotten sports heroes: Janus Ooms
- NLroei Van Oupen receives the Golden Belt Archived 16 July 2011 at the Wayback Machine
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