The 2005 AIG Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts. It was the 32nd edition of the event known that year as the AIG Japan Open Tennis Championships, and was part of the International Series Gold of the 2005 ATP Tour, and of the Tier III Series of the 2005 WTA Tour. Both the men's and the women's events took place at the Ariake Coliseum in Tokyo, Japan, from 3 October through 9 October 2005. Wesley Moodie and Nicole Vaidià ¡ová won the singles titles.
Wesley Moodie defeated Mario AnÃÂiÃÂ, 1âÂÂ6, 7âÂÂ6<sup>(9âÂÂ7)</sup>, 6âÂÂ4
Nicole Vaidià ¡ová defeated Tatiana Golovin, 7âÂÂ6<sup>(7âÂÂ4)</sup>, 3âÂÂ2, retired
Satoshi Iwabuchi / Takao Suzuki defeated Simon Aspelin / Todd Perry, 5âÂÂ4<sup>(7âÂÂ3)</sup>, 5âÂÂ4<sup>(15âÂÂ13)</sup>
Gisela Dulko / Maria Kirilenko defeated Shinobu Asagoe / MarÃÂa Vento-Kabchi, 7âÂÂ5, 4âÂÂ6, 6âÂÂ3