1999 Rado Swiss Open Gstaad – Singles

Àlex Corretja was the defending champion, but was forced to withdraw at his first round match against tournament runner-up Nicolás Lapentti.

Albert Costa won the title by defeating Nicolás Lapentti 7–6(7–4), 6–3, 6–4 in the final.

Seeds
• # 🇧🇷 Gustavo Kuerten (second round)

• # 🇪🇸 Àlex Corretja (first round, retired)

• # Marcelo Ríos (second round)

• # 🇬🇧 Greg Rusedski (first round)

• # 🇪🇸 Félix Mantilla (semifinals)

• # 🇪🇸 Francisco Clavet (quarterfinals)

• # 🇦🇷 Mariano Zabaleta (second round)

• # 🇪🇸 Albert Costa (champion)