1998 Rado Open – Singles

Àlex Corretja defeated Boris Becker in the final, 7–6(7–5), 7–5, 6–3 to win the singles tennis title at the 1998 Swiss Open.

Félix Mantilla was the defending champion, but lost in the quarterfinals to Becker.

This tournament marked the first professional appearance of future 20-time major champion and world No. 1 Roger Federer; he lost in the first round to lucky loser Lucas Arnold Ker.

Seeds
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated. • #🇨🇱 Marcelo Ríos (semifinals)

• #🇷🇺 Yevgeny Kafelnikov (first round)

• #🇪🇸 Àlex Corretja (champion)

• #🇫🇷 Cédric Pioline (second round)

• #🇪🇸 Félix Mantilla (quarterfinals)

• #🇪🇸 Albert Costa (quarterfinals)

• #🇪🇸 Alberto Berasategui (first round)

• #🇩🇪 Nicolas Kiefer (quarterfinals)

Qualifying seeds
• # 🇦🇷 Lucas Arnold Ker (qualifying competition, Lucky loser)

• # 🇩🇪 Oliver Gross (qualified)

• # 🇪🇸 Jacobo Díaz (first round)

• # 🇭🇺 Attila Sávolt (second round)

• # 🇪🇸 Quino Muñoz (second round)

• # 🇦🇷 Agustín Garizzio (qualifying competition)

• # 🇪🇸 Tomás Carbonell (qualified)

• # 🇪🇸 Óscar Serrano (second round)

Qualifiers
• # 🇪🇸 Tomás Carbonell

• # 🇩🇪 Oliver Gross

• # 🇦🇷 Daniel Orsanic

• # 🇫🇷 Thierry Guardiola

Lucky loser

 * 1) 🇦🇷 Lucas Arnold Ker (replaced 🇩🇪 Tommy Haas)