The 2004 Adidas International was a combine men's and women's tennis tournament played on outdoor hard courts at the NSW Tennis Centre in Sydney in Australia that was part of the International Series of the 2004 ATP Tour and of Tier II of the 2004 WTA Tour. The tournament ran from 11 through 18 January 2004. Lleyton Hewitt and Justine Henin-Hardenne won the singles titles.

Finals

Men's singles

🇦🇺 Lleyton Hewitt defeated 🇪🇸 Carlos Moyá 4–3 (Moyá retired)

Women's singles

🇧🇪 Justine Henin-Hardenne defeated 🇫🇷 Amélie Mauresmo 6–4, 6–4

Men's doubles

🇸🇪 Jonas Björkman / 🇦🇺 Todd Woodbridge defeated 🇺🇸 Bob Bryan / 🇺🇸 Mike Bryan 7–6(7–3), 7–5

Women's doubles

Cara Black / 🇦🇺 Rennae Stubbs defeated 🇷🇺 Dinara Safina / 🇺🇸 Meghann Shaughnessy 7–5, 3–6, 6–4