2009 Masters Series Hamburg
| 2009 International German Open | |
|---|---|
| Date | 20–26 July |
| Edition | 103rd |
| Category | ATP World Tour 500 |
| Draw | 48S / 16D |
| Prize money | €1,000,000 |
| Surface | Clay / Outdoor |
| Location | Hamburg, Germany |
| Champions | |
| Singles | |
 Nikolay Davydenko |
|
| Doubles | |
 Simon Aspelin /  Paul Hanley |
|
The 2009 International German Open was a men's tennis tournament played on outdoor red clay courts. It was the 103rd edition of the event known that year as the International German Open and was part of the ATP World Tour 500 series of the 2009 ATP World Tour. It took place at the Am Rothenbaum in Hamburg, Germany, from 20 July through 26 July 2009.
*Seedings based on the July 13, 2009 rankings.
The following players received wildcards into the singles main draw
The following players received entry from the qualifying draw:
Nikolay Davydenko defeated 
Paul-Henri Mathieu, 6–4, 6–2
Simon Aspelin / Paul Hanley defeated 
Marcelo Melo / 
Filip Polášek, 6–3, 6–3
...
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