2009 International German Open
Image:2009.05.30 Roland Garros Rafael Nadal.JPG|thumb|222px|ATP World Tour No. 2 Rafael Nadal did not defend his 2008 [Hamburg Masters|2008] Hamburg title
Image:Gilles Simon at the 2009 French Open 6.jpg|thumb|222px|ATP World Tour No. 7 Gilles Simon headlined the singles field in Hamburg
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.
ATP entrants
Seeds
- Seedings based on 13 July 2009 rankings.
Other entrants
The following players received wildcards into the singles main drawThe following players received entry from the qualifying draw:
Finals
Singles
Nikolay Davydenko defeated Paul-Henri Mathieu, 6–4, 6–2- It was Davydenko's first title of the year, and his 15th overall.