Austrian Netherlands | Austrian | Austrian Empire | Australian Open | French Open | Open University | open source | U.S. Open | Wacken Open Air | War of the Austrian Succession | The Open Championship | U.S. Open (tennis) | All England Open Badminton Championships | U.S. Open (golf) | Open Source | Open-pit mining | 2006 Australian Open | Open Software Foundation | Indira Gandhi National Open University | Lamar Hunt U.S. Open Cup | Austrian Football First League | 2005 Australian Open – Men's Singles | U.S. Women's Open | open access | Gerry Weber Open | Austrian Academy of Sciences | Swedish Open | International GT Open | Federal Open Market Committee | 2014 Australian Open – Men's Singles |
He won the 2007 Montfortpokal Austrian Open tournament in Feldkirch, beating a competitive field along the way, namely Michael Felder, Sandor Tot, and Martin Kempter in the final.
De Mars enjoyed more success in 1983, including the Pan American Games and US Senior Nationals, and in 1984, winning the Austrian Open, Canada Cup (now known as the "Rendezvous"), and the US Senior Nationals.
In 2007, she won a gold medal in the under-55 kg class at the Austrian Open in Innsbruck, Austria, and bronze medals at the Trelleborg Open in Trelleborg, Sweden, and the Belgian Open in Herentals, Belgium.