1991 ABN AMRO World Tennis Tournament – Singles
was the reigning champion of the singles event at the ABN World Tennis Tournament but did not participate in this edition. Unseeded Omar Camporese won the singles title after a 3–6, 7–6, 7–6 win in the final against first-seeded Ivan Lendl.Seeds
- Ivan Lendl '
- Thomas Muster '
- Emilio Sánchez '
- Goran Ivanišević '
- Andrei Chesnokov '
- Jonas Svensson '
- Jakob Hlasek '
- Karel Nováček '
Draws
Finals