Two-time defending champion Andre Agassi defeated Carlos Moyá in the final, 6–3, 6–3 to win the men's singles tennis title at the 2003 Miami Open.

Seeds

All thirty-two seeds received a bye to the second round. • # 🇦🇺 Lleyton Hewitt (second round) • # 🇺🇸 Andre Agassi (champion) • # 🇪🇸 Juan Carlos Ferrero (third round) • # Roger Federer (quarterfinals) • # 🇪🇸 Carlos Moyá (final) • # 🇺🇸 Andy Roddick (third round) • # 🇷🇺 Marat Safin (second round) • # 🇨🇿 Jiří Novák (second round) • # 🇪🇸 Albert Costa (semifinals) • # 🇦🇷 David Nalbandian (third round) • # 🇫🇷 Sébastien Grosjean (second round) • # 🇩🇪 Rainer Schüttler (third round) • # 🇹🇭 Paradorn Srichaphan (semifinals) • # Sjeng Schalken (fourth round) • # 🇧🇷 Gustavo Kuerten (second round) • # 🇪🇸 Àlex Corretja (second round) • # 🇦🇷 Gastón Gaudio (second round) • # 🇬🇧 Tim Henman (second round) • # 🇲🇦 Younes El Aynaoui (quarterfinals) • # Fernando González (second round) • # 🇺🇸 James Blake (third round) • # 🇪🇸 Tommy Robredo (second round) • # 🇷🇺 Mikhail Youzhny (second round) • # 🇷🇺 Yevgeny Kafelnikov (third round) • # 🇧🇪 Xavier Malisse (second round) • # 🇦🇷 Guillermo Coria (fourth round) • # Andrei Pavel (second round) • # Marcelo Ríos (fourth round, withdrew because of a back injury) • # Wayne Ferreira (third round) • # 🇦🇷 Juan Ignacio Chela (third round) • # 🇧🇾 Max Mirnyi (second round) • # 🇫🇮 Jarkko Nieminen (third round)

Draw

Finals

Top half

Section 1

Section 2

Section 3

Section 4

Bottom half

Section 5

Section 6

Section 7

Section 8

Qualifying

Qualifying seeds

• # 🇸🇪 Jonas Björkman (qualified) • # 🇸🇰 Karol Beck (qualified) • # 🇵🇪 Luis Horna (qualified) • # 🇧🇷 Flávio Saretta (qualifying competition, lucky loser) • # 🇫🇷 Jean-René Lisnard (qualified) • # 🇺🇸 Justin Gimelstob (qualifying competition) • # 🇸🇪 Magnus Norman (qualifying competition) • # 🇲🇦 Hicham Arazi (first round) • # 🇦🇹 Jürgen Melzer (first round) • # Irakli Labadze (qualifying competition) • # 🇩🇪 Alexander Waske (first round) • # 🇺🇸 Jeff Morrison (qualifying competition, retired) • # Cecil Mamiit (qualifying competition) • # 🇧🇪 Kristof Vliegen (qualifying competition) • # Marc Rosset (first round) • # 🇫🇷 Michaël Llodra (qualified) • # 🇨🇿 Jan Vacek (qualified) • # 🇵🇪 Iván Miranda (first round) • # 🇦🇺 Scott Draper (first round) • # 🇺🇸 Robert Kendrick (qualifying competition) • # 🇧🇷 Ricardo Mello (first round) • # 🇷🇺 Andrei Stoliarov (qualified) • # 🇫🇷 Cyril Saulnier (qualified) • # 🇧🇪 Christophe Rochus (qualified)

Qualifiers

• # 🇸🇪 Jonas Björkman • # 🇸🇰 Karol Beck • # 🇵🇪 Luis Horna • # 🇫🇷 Michaël Llodra • # 🇫🇷 Jean-René Lisnard • # 🇨🇿 Jan Vacek • # 🇧🇪 Christophe Rochus • # 🇦🇺 Peter Luczak • # 🇪🇸 Francisco Clavet • # 🇷🇺 Andrei Stoliarov • # 🇪🇸 Fernando Verdasco • # 🇫🇷 Cyril Saulnier

Lucky loser

Qualifying draw

First qualifier

Second qualifier

Third qualifier

Fourth qualifier

Fifth qualifier

Sixth qualifier

Seventh qualifier

Eighth qualifier

Ninth qualifier

Tenth qualifier

Eleventh qualifier

Twelfth qualifier