Marcelo Ríos defeated Andre Agassi in the final, 7–5, 6–3, 6–4 to win the men's singles tennis title at the 1998 Miami Open. With the win, he completed the Sunshine Double. Thomas Muster was the reigning champion, but did not participate this year.

Seeds

All thirty-two seeds received a bye to the second round. • # 🇺🇸 Pete Sampras (third round) • # 🇨🇿 Petr Korda (fourth round) • # Marcelo Ríos (champion) • # 🇦🇺 Patrick Rafter (second round) • # 🇬🇧 Greg Rusedski (fourth round) • # 🇷🇺 Yevgeny Kafelnikov (fourth round) • # 🇸🇪 Jonas Björkman (third round) • # 🇪🇸 Álex Corretja (semifinals) • # 🇺🇸 Michael Chang (withdrew) • # 🇧🇷 Gustavo Kuerten (quarterfinals) • # 🇸🇰 Karol Kučera (third round) • # 🇪🇸 Félix Mantilla (second round) • # 🇪🇸 Sergi Bruguera (second round) • # 🇫🇷 Cédric Pioline (third round) • # 🇦🇺 Mark Philippoussis (second round) • # 🇪🇸 Carlos Moyà (third round) • # 🇪🇸 Alberto Berasategui (second round) • # 🇬🇧 Tim Henman (semifinals) • # 🇪🇸 Álbert Costa (fourth round) • # Goran Ivanišević (fourth round) • # 🇸🇪 Magnus Norman (second round) • # 🇸🇪 Thomas Enqvist (quarterfinals, retired) • # 🇫🇷 Fabrice Santoro (fourth round) • # 🇺🇦 Andriy Medvedev (third round) • # 🇩🇪 Nicolas Kiefer (fourth round) • # 🇸🇪 Magnus Larsson (second round) • # Marc Rosset (third round) • # Jan Siemerink (third round) • # 🇺🇸 Andre Agassi (final) • # 🇩🇪 Tommy Haas (third round) • # 🇪🇸 Francisco Clavet (third round) • # Wayne Ferreira (fourth round)

Draw

Finals

Top half

Section 1

Section 2

Section 3

Section 4

Bottom half

Section 5

Section 6

Section 7

Section 8