The 2003 Australian Open was a tennis tournament held in 2003. It was the first Grand Slam event of the 2003 ATP Tour and the 2003 WTA Tour. It was the 91st edition of the event.
Thomas Johansson could not defend his 2002 title due to an injury which would rule him out for all of 2003. Jennifer Capriati was unsuccessful in her title defence, being defeated in the first round by German Marlene Weingärtner. Andre Agassi won his fourth Australian Open and final Grand Slam title, defeating Rainer Schüttler in a lopsided final. Serena Williams defeated her sister Venus in the final in three sets, to win her fourth consecutive Grand Slam title to hold all four Grand Slam titles at once.
Seniors [edit]
Men's Singles [edit]
Andre Agassi def. 
Rainer Schüttler, 6–2, 6–2, 6–1
- It was Agassi's 8th (and last) career Grand Slam title, and his 4th Australian Open title (an Open Era record until it was tied by Roger Federer in 2010).
Women's Singles [edit]
Serena Williams[1] def. Venus Williams, 7–6(7–4), 3–6, 6–4
- It was Serena's 5th career Grand Slam title, her 4th in a row, and her 1st Australian Open title. this also marks Serena claiming a Career Grand Slam and the Serena Slam
Men's Doubles [edit]
Michaël Llodra / Fabrice Santoro def. 
Mark Knowles / 
Daniel Nestor, 6–4, 3–6, 6–3
Women's Doubles [edit]
Serena Williams / Venus Williams def. 
Virginia Ruano Pascual / 
Paola Suárez, 4–6, 6–4, 6–3
Mixed Doubles [edit]
Martina Navratilova / 
Leander Paes def. 
Eleni Daniilidou / 
Todd Woodbridge, 6–4, 7–5
Juniors [edit]
Boys' Singles [edit]
Marcos Baghdatis[2] def. 
Florin Mergea, 6–4, 6–4
Girls' Singles [edit]
Barbora Strýcová def. 
Viktoriya Kutuzova, 0–6, 6–2, 6–2
Boys' Doubles [edit]
Scott Oudsema / Phillip Simmonds def. Florin Mergea / Horia Tecău, 6–4, 6–4
Girls' Doubles [edit]
Casey Dellacqua / Adriana Szili def. Petra Cetkovská / Barbora Strýcová, 6–3, 4–4, ret.
Men's Singles [edit]
- Lleyton Hewitt (Fourth Round, lost to Younes El Aynaoui)
- Andre Agassi (Champion)
 Marat Safin (Third Round, withdrew before match against Rainer Schüttler)- Juan Carlos Ferrero (Quarterfinals, lost to Wayne Ferreira)
- Carlos Moyà (Second Round, lost to Mardy Fish)
 Roger Federer (Fourth Round, lost to David Nalbandian)- Jiří Novák (Third Round, lost to Mikhail Youzhny)
- Albert Costa (Third Round, lost to Félix Mantilla)
- Andy Roddick (Semifinals, lost to Rainer Schüttler)
- David Nalbandian (Quarterfinals, lost to Rainer Schüttler)
 Paradorn Srichaphan (Second Round, lost to Mark Philippoussis)- Sébastien Grosjean (Quarterfinals, lost to Andre Agassi)
 Fernando González (Second Round, lost to Alberto Martín)- Guillermo Cañas (Second Round, lost to Guillermo Coria)
- Àlex Corretja (First Round, lost to Feliciano López)
 Sjeng Schalken (Second Round, lost to Mario Ančić)- Gastón Gaudio (Second Round, lost to Sargis Sargsian)
 Younes El Aynaoui (Quarterfinals, lost to Andy Roddick)- Juan Ignacio Chela (Second Round, lost to Fernando Vicente)
 Xavier Malisse (Third Round, lost to David Nalbandian)- Andrei Pavel (First Round, lost to Renzo Furlan, retired)
- Yevgeny Kafelnikov (Second Round, lost to Jarkko Nieminen)
- James Blake (Fourth Round, lost to Rainer Schüttler)
 Nicolás Lapentti (Third Round, lost to Sébastien Grosjean)- Mikhail Youzhny (Fourth Round, lost to Andy Roddick)
- Tommy Robredo (First Round, lost to Wayne Ferreira)
- Jan-Michael Gambill (Second Round, lost to Félix Mantilla)
- Fabrice Santoro (Third Round, lost to Juan Carlos Ferrero)
- Nicolas Escudé (Third Round, lost to Andre Agassi)
 Gustavo Kuerten (Second Round, lost to Radek Štěpánek)- Rainer Schüttler (Final, lost to Andre Agassi)
 Stefan Koubek (First Round, lost to Andreas Vinciguerra)
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Women's Singles [edit]
- Serena Williams (Champion)
- Venus Williams (Final, lost to Serena Williams)
- Jennifer Capriati (First Round, lost to Marlene Weingärtner)
- Kim Clijsters (Semifinals, lost to Serena Williams)
- Justine Henin-Hardenne (Semifinals, lost to Venus Williams)
- Monica Seles (Second Round, lost to Klára Koukalová)
 Daniela Hantuchová (Quarterfinals, lost to Serena Williams)- Anastasia Myskina (Quarterfinals, lost to Kim Clijsters)
- Lindsay Davenport (Fourth Round, lost to Justine Henin-Hardenne)
- Chanda Rubin (Fourth Round, lost to Anastasia Myskina)
 Magdalena Maleeva (Third Round, lost to Elena Bovina)- Patty Schnyder (Fourth Round, lost to Daniela Hantuchová)
 Silvia Farina Elia (Second Round, lost to Nicole Pratt) Anna Smashnova (Third Round, lost to Amanda Coetzer)- Alexandra Stevenson (Second Round, lost to Denisa Chládková)
- Nathalie Dechy (Third Round, lost to Eleni Daniilidou)
- Elena Dementieva (First Round, lost to Barbara Schwartz)
- Eleni Daniilidou (Fourth Round, lost to Serena Williams)
 Amanda Coetzer (Fourth Round, lost to Kim Clijsters)- Elena Bovina (Fourth Round, lost to Meghann Shaughnessy)
 Ai Sugiyama (Second Round, lost to Nadia Petrova) Anne Kremer (Second Round, lost to Evie Dominikovic)- Paola Suárez (Third Round, lost to Nicole Pratt)
- Tatiana Panova (Third Round, lost to Lindsay Davenport)
- Meghann Shaughnessy (Quarterfinals, lost to Serena Williams)
- Tamarine Tanasugarn (Third Round, lost to Serena Williams)
- Lisa Raymond (Second Round, lost to Anca Barna)
- Clarisa Fernández (Third Round, lost to Anastasia Myskina)
 Iva Majoli (First Round, lost to Cristina Torrens Valero)- Janette Husárová (Second Round, lost to Virginia Ruano Pascual)
- Conchita Martínez (First Round, lost to Amy Frazier)
 Katarina Srebotnik (Third Round, lost to Justine Henin-Hardenne)
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- ^ Serena completed the "Serena Slam", winning all four Grand Slam tournaments in a row.
- ^ Baghdatis reached the 2006 men's singles final, but lost to Roger Federer.
Andre Agassi
Michaël Llodra / 
Leander Paes
Marcos Baghdatis
Barbora Strýcová
Casey Dellacqua / 
Rainer Schüttler, 6–2, 6–2, 6–1
Mark Knowles / 
Daniel Nestor, 6–4, 3–6, 6–3
Virginia Ruano Pascual / 
Paola Suárez, 4–6, 6–4, 6–3
Eleni Daniilidou / 
Florin Mergea, 6–4, 6–4
Viktoriya Kutuzova, 0–6, 6–2, 6–2
