The 2009 Siemens Open was a professional tennis tournament played on outdoor red clay courts. This was the seventeenth edition of the tournament which is part of the Tretorn SERIE+ of the 2009 ATP Challenger Tour. It took place in Scheveningen, Netherlands between 6 July and 12 July 2009.
Singles entrants
Seeds
Rankings are as of June 29, 2009.
Other entrants
The following players received wildcards into the singles main draw: Stephan Fransen Thomas Schoorel Raemon Sluiter
The following players received entry from the qualifying draw: Augustin Gensse Rameez Junaid Gero Kretschmer Filip Prpic Adam Vejmělka (as a Lucky Loser)
Champions
Singles
Kristof Vliegen def. Albert Montañés, 4–2, RET.
Doubles
Lucas Arnold Ker / Máximo González def. Thomas Schoorel / Nick van der Meer, 7–5, 6–2