| Men's doubles | |
|---|---|
| 2004 China Open | |
| Champions |  Justin Gimelstob Graydon Oliver |
| Runners-up | Alex Bogomolov Jr. Taylor Dent |
| Final score | 4–6, 6–4, 7–6(8–6) |
The event was being held for the first time since 1997. Mahesh Bhupathi and Leander Paes were the defending champions.
Justin Gimelstob and Graydon Oliver won the title, defeating Alex Bogomolov Jr. and Taylor Dent 4–6, 6–4, 7–6(8–6) in the final.
Ashley Fisher / Tripp Phillips (quarterfinals) Justin Gimelstob / Graydon Oliver (champions)
Dominik Hrbatý / Scott Humphries (quarterfinals)
Rainer Schüttler / 
Mikhail Youzhny (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | A Fisher T Phillips | 6 | 6 | ||||||||||||||||||||||||
| D Bowen J Marshall | 4 | 1 | 1 | A Fisher T Phillips | 3 | 2 | |||||||||||||||||||||
| WC |  SX Zeng B Zhu | 2 | 7 | 3 | A Bogomolov Jr. T Dent | 6 | 6 | ||||||||||||||||||||
| A Bogomolov Jr. T Dent | 6 | 5 | 6 | A Bogomolov Jr. T Dent | 6 | 6 | |||||||||||||||||||||
| 3 | D Hrbatý S Humphries | 2 | 6 | 6 | B Coupe N Healey | 3 | 2 | ||||||||||||||||||||
| WC | H Lu Y Wang | 6 | 1 | 2 | 3 | D Hrbatý S Humphries | 3 | 3 | |||||||||||||||||||
| B Coupe N Healey | 6 | 6 | B Coupe N Healey | 6 | 6 | ||||||||||||||||||||||
 JC Ferrero G García-López | 2 | 3 | A Bogomolov Jr. T Dent | 6 | 4 | 66 | |||||||||||||||||||||
 J Landsberg  T Shimada | 7 | 6 | 2 | J Gimelstob G Oliver | 4 | 6 | 78 | ||||||||||||||||||||
 Y-h Lu  K Pless | 5 | 4 | J Landsberg T Shimada | 6 | 2 | 77 | |||||||||||||||||||||
| S Huss R Lindstedt | 77 | 1 | 6 | S Huss R Lindstedt | 3 | 6 | 64 | ||||||||||||||||||||
| 4 | R Schüttler M Youzhny | 64 | 6 | 4 | J Landsberg T Shimada | 2 | 3 | ||||||||||||||||||||
 H-t Lee G Weiner | 6 | 1 | 64 | 2 | J Gimelstob G Oliver | 6 | 6 | ||||||||||||||||||||
 I Heuberger  J Nieminen | 1 | 6 | 77 | I Heuberger J Nieminen | 3 | 4 | |||||||||||||||||||||
 Sa Ratiwatana So Ratiwatana | 4 | 64 | 2 | J Gimelstob G Oliver | 6 | 6 | |||||||||||||||||||||
| 2 | J Gimelstob G Oliver | 6 | 77 | ||||||||||||||||||||||||
Marat Safin defeated Lleyton Hewitt in the final, 1–6, 6–3, 6–4, 6–4 to win the men's singles tennis title at the 2005 Australian Open. It was his second and last major title, having also won the 2000 US Open. Hewitt was the first Australian to reach the final since Pat Cash in 1988.
Bob and Mike Bryan were the defending champions, but lost in the third round to Leoš Friedl and Mikhail Youzhny.
Justin Gimelstob and Sébastien Lareau were the defending champions but only Gimelstob competed that year with Jared Palmer.
Jan-Michael Gambill and Scott Humphries were the defending champions but they competed with different partners that year, Gambill with Jonathan Stark and Humphries with Justin Gimelstob.
Justin Gimelstob and Graydon Oliver won the doubles tennis matches in the final 5–7, 6–4, 6–4, against Yves Allegro and Roger Federer
Jared Palmer and Jeff Tarango were the defending champions, but Palmer did not participate this year. Tarango partnered Yevgeny Kafelnikov, losing in the first round.
Grant Stafford and Kevin Ullyett were the defending champions. Stafford chose to compete at Indianapolis in the same week. Ullyett partnered with Piet Norval but lost in the semifinals to the eventual champions Justin Gimelstob and Sébastien Lareau.
Justin Gimelstob and Sébastien Lareau won in the final over David Adams and John-Laffnie de Jager, 7–5, 6–7(2–7), 6–3.
Justin Gimelstob and Graydon Oliver were the defending champions, but Oliver did not participate this year. Gimelstob partnered Nathan Healey and successfully defended his title.
Grant Stafford and Kevin Ullyett were the defending champions, but Ullyett did not participate this year. Stafford partnered Lan Bale, losing in the quarterfinals.
Patrick Galbraith and Justin Gimelstob were the defending champions, but did not partner together this year. Galbraith partnered Brian MacPhie, losing in the quarterfinals. Gimelstob partnered Jared Palmer, losing in the first round.
In order to commemorate the first joint edition since 1996, a mixed doubles tournament was held by combining female players of the WTA China Open and the male players of the ATP Beijing Challenger. The tournament had a prize money of USD $6,000, but as this was an exhibition tournament, no points were given for the ATP and WTA rankings.
Todd Woodbridge and Mark Woodforde were the defending champions, but lost in quarterfinals to Bob Bryan and Mike Bryan.
Justin Gimelstob and Nicolas Kiefer were the defending champions, but Kiefer did not compete this year. Gimelstob teamed up with Ashley Fisher and lost in quarterfinals to Yves Allegro and Michael Kohlmann.
Todd Woodbridge and Mark Woodforde were the defending champions, but lost in the quarterfinals to tournament runners-up Justin Gimelstob and Patrick Rafter.
Leander Paes was the defending champion, but lost in the quarterfinals to Wayne Arthurs.
Doug Flach and Sandon Stolle were the defending champions, but competed this year with different partners. Flach teamed up with Mark Merklein and lost in the first round to David DiLucia and Laurence Tieleman, while Stolle teamed up with Max Mirnyi and lost in the first round to Wayne Ferreira and Nenad Zimonjić.
Michael Chang was the defending champion and successfully defended his title, by defeating Petr Korda 5–7, 6–2, 6–1 in the final.
Patrick Rafter and Sandon Stolle were the defending champions, but Rafter did not compete this year. Stolle teamed up with Wayne Black and lost in the semifinals to Byron Black and Wayne Ferreira.
Marius Barnard and Piet Norval were the defending champions, but Norval did not compete this year. Barnard teamed up with Fernon Wibier and lost in the first round to Doug Flach and T. J. Middleton.
Todd Woodbridge and Mark Woodforde were the defending champions, but none competed this year.