| 2003 AIG Japan Open Tennis Championships | |
|---|---|
| Date | September 29 – October 5 |
| Edition | 30th |
| Surface | Hard / outdoors |
| Location | Tokyo, Japan |
| Venue | Ariake Coliseum |
| Champions | |
| Men's singles | |
 Rainer Schüttler[1] | |
| Women's singles | |
 Maria Sharapova | |
| Men's doubles | |
 Justin Gimelstob / Nicolas Kiefer[2] | |
| Women's doubles | |
Maria Sharapova /  Tamarine Tanasugarn | |
The 2003 AIG Japan Open Tennis Championships was a combined men's and women's tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo in Japan that was part of the International Series Gold of the 2003 ATP Tour and of Tier III of the 2003 WTA Tour. The tournament ran from September 29 through October 5, 2003. Rainer Schüttler and Maria Sharapova won the singles title.
- ^ "2003 Tokyo Men's Singles draw". www.atpworldtour.com. Association of Tennis Professionals (ATP).
- ^ "2003 Tokyo Men's Doubles draw". www.atpworldtour.com. Association of Tennis Professionals (ATP).