2003 Australian Open

[1] 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.

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.

Florin Mergea, 6–4, 6–4 Barbora Strýcová defeated Viktoriya Kutuzova, 0–6, 6–2, 6–2 Scott Oudsema / Phillip Simmonds defeated Florin Mergea / Horia Tecău, 6–4, 6–4 Casey Dellacqua / Adriana Szili defeated Petra Cetkovská / Barbora Strýcová, 6–3, 4–4, ret.

David Hall defeated Robin Ammerlaan, 6–1, 7-6 Esther Vergeer defeated Daniela Di Toro, 2–6, 6–0, 6-3 Withdrawn players: Tim Henman, Tommy Haas, Thomas Johansson, Marcelo Ríos, Greg Rusedski, Paul-Henri Mathieu, Arnaud Clément; Martina Hingis, Amélie Mauresmo, Jelena Dokic.