| 2009 Siemens Open | |
|---|---|
| Date | July 6 – July 12 |
| Edition | 17th |
| Location | Scheveningen, Netherlands |
| Champions | |
| Singles | |
 Kristof Vliegen | |
| Doubles | |
 Lucas Arnold Ker / Máximo González | |
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.
| Nationality | Player | Ranking* | Seeding |
|---|---|---|---|
 ESP | Albert Montañés | 33 | 1 |
| ARG | Máximo González | 62 | 2 |
| BEL | Steve Darcis | 77 | 3 |
 FRA | Julien Benneteau | 81 | 4 |
| BEL | Kristof Vliegen | 82 | 5 |
 AUT | Daniel Köllerer | 91 | 6 |
| ESP | Daniel Gimeno-Traver | 98 | 7 |
 GER | Simon Greul | 106 | 8 |
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) Kristof Vliegen def. Albert Montañés, 4–2, RET.
Lucas Arnold Ker / Máximo González def. Thomas Schoorel / Nick van der Meer, 7–5, 6–2
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