1988 Mercedes Cup – Singles

Miloslav Mečíř was the defending champion, but lost in the third round to Thomas Muster.

Andre Agassi won the title by defeating Andrés Gómez 6–4, 6–2 in the final.

Seeds
All seeds received a bye to the second round. • # Miloslav Mečíř (third round)

• # 🇺🇸 Andre Agassi (champion)

• # 🇺🇸 Brad Gilbert (third round)

• # 🇫🇷 Yannick Noah (quarterfinals)

• # 🇸🇪 Kent Carlsson (third round)

• # 🇫🇷 Henri Leconte (semifinals)

• # 🇸🇪 Jonas Svensson (quarterfinals)

• # 🇪🇸 Emilio Sánchez (third round)

• # 🇦🇷 Guillermo Pérez Roldán (semifinals)

• # 🇸🇪 Anders Järryd (second round)

• # 🇪🇨 Andrés Gómez (final)

• # 🇦🇷 Martín Jaite (third round)

• # Ronald Agénor (quarterfinals)

• # (n/a)

• # 🇪🇸 Jordi Arrese (second round)

• # Tomáš Šmíd (third round)