The 2011 Siemens Open was a professional tennis tournament played on clay courts. It was part of the Tretorn SERIE+ of the 2011 ATP Challenger Tour. It was the 19th edition of the tournament. It took place in Scheveningen, Netherlands between July 4 and July 10, 2011.
ATP entrants
Seeds
1 Rankings are as of June 20, 2011.
Other entrants
The following players received wildcards into the singles main draw: Stephan Fransen Ivo Minář Antal van der Duim Nick van der Meer
The following players received entry from the qualifying draw: Colin Ebelthite Pierre-Hugues Herbert Juho Paukku Mathieu Rodrigues
Champions
Singles
Steve Darcis def. Marsel İlhan, 6–3, 4–6, 6–2
Doubles
Colin Ebelthite / Adam Feeney def. Rameez Junaid / Sadik Kadir, 6–4, 6–7(5–7), [10–7]