2009 AIG Japan Open Tennis Championships
| 2009 Rakuten Japan Open Tennis Championships | |
|---|---|
| Date | October 5 – October 11 |
| Edition | 36th |
| Category | ATP World Tour 500 |
| Surface | Hard / outdoor |
| Location | Tokyo, Japan |
| Venue | Ariake Coliseum |
| Champions | |
| Singles | |
 Jo-Wilfried Tsonga
|
|
| Doubles | |
 Julian Knowle / Jürgen Melzer
|
|
The 2009 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 36th edition of the event known that year as the Rakuten Japan Open Tennis Championships, and was part of the 500 Series of the 2009 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from October 5 through October 11, 2009.
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Jo-Wilfried Tsonga defeated 
Mikhail Youzhny, 6–3, 6–3
Julian Knowle / Jürgen Melzer defeated 
Ross Hutchins / 
Jordan Kerr, 6–2, 5–7, [10–8]
...
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