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. Second-seeded Jo-Wilfried Tsonga won the singles title.

ATP entrants

Seeds

Other entrants

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw:

Finals

Singles

🇫🇷 Jo-Wilfried Tsonga defeated 🇷🇺 Mikhail Youzhny, 6–3, 6–3

Doubles

🇦🇹 Julian Knowle / 🇦🇹 Jürgen Melzer defeated 🇬🇧 Ross Hutchins / 🇦🇺 Jordan Kerr, 6–2, 5–7, [10–8]