Andre Agassi defeated Rainer Schüttler in the final, 6–2, 6–2, 6–1 to win the men's singles tennis title at the 2003 Australian Open. It was his fourth Australian Open title and his eighth and last major title overall. With the win, Agassi claimed his 21st consecutive match win at the Australian Open, as he won the title in 2000 and 2001 (he did not play in the 2002 event due to injury). Thomas Johansson was the reigning champion, but did not participate due to injury. Tim Henman and Greg Rusedski's withdrawals from the tournament marked the first time there were no British players competing in the Australian Open in the Open Era. This event marked the first main-draw major appearance for David Ferrer, who lost to Lee Hyung-taik in the first round; it was also the final major appearance for former world No. 4 Richard Krajicek.

Seeds

The seeded players are listed below. Andre Agassi is the champion; others show the round in which they were eliminated.

Draw

Finals

Top draw

Section 1

Section 2

Section 3

Section 4

Bottom draw

Section 5

Section 6

Section 7

Section 8

Other entry information

Wild cards

• 🇦🇺 Scott Draper • 🇫🇷 Richard Gasquet • 🇦🇺 Ryan Henry • 🇦🇺 Andrew Ilie • 🇦🇺 Peter Luczak • 🇯🇵 Gouichi Motomura • 🇦🇺 Todd Reid • 🇦🇺 Joseph Sirianni

Protected ranking

• Richard Krajicek (40)

Qualifiers

• 🇫🇷 Julien Benneteau • 🇺🇸 Alex Bogomolov Jr. • 🇺🇸 Jack Brasington • 🇦🇺 Jaymon Crabb • 🇧🇷 Marcos Daniel • 🇮🇹 Renzo Furlan • 🇸🇪 Joachim Johansson • 🇺🇿 Vadim Kutsenko • 🇦🇺 Todd Larkham • 🇸🇪 Magnus Larsson • 🇩🇪 Björn Phau • 🇩🇪 David Prinosil • 🇧🇪 Christophe Rochus • 🇫🇷 Julien Varlet • 🇸🇪 Andreas Vinciguerra • 🇩🇪 Alexander Waske

Lucky losers

• 🇫🇷 Grégory Carraz

Withdrawals

• 🇫🇷 Arnaud Clément (38) → replaced by 🇫🇷 Jean-René Lisnard (105) • 🇩🇪 Nicolas Kiefer (72) → replaced by 🇺🇸 Justin Gimelstob (106) • 🇩🇪 Tommy Haas (11) → replaced by 🇸🇪 Magnus Norman (107) • 🇸🇪 Thomas Johansson (14) → replaced by Željko Krajan (108) • 🇫🇷 Paul-Henri Mathieu (36) → replaced by 🇪🇸 Juan Balcells (109) • 🇫🇷 Olivier Mutis (94) → replaced by 🇨🇿 Jan Vacek (110) • 🇫🇷 Julien Boutter (78) → replaced by Cecil Mamiit (111) • 🇺🇸 Todd Martin (47) → replaced by 🇪🇸 Francisco Clavet (113) • 🇬🇧 Tim Henman (8) → replaced by 🇦🇷 Mariano Puerta (115) • 🇺🇸 Taylor Dent (57) → replaced by 🇸🇰 Karol Beck (116) • Nicolás Massú (56) → replaced by 🇺🇸 Alex Kim (117) • 🇬🇧 Greg Rusedski (31) → replaced by 🇮🇹 Andrea Gaudenzi (119) • 🇨🇿 Bohdan Ulihrach (76) → replaced by 🇦🇹 Julian Knowle (120) • 🇸🇪 Jonas Björkman (48) → replaced by 🇫🇷 Grégory Carraz (LL)