# 1991 ABN AMRO World Tennis Tournament – Singles

Brad Gilbert 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$^{(7–4)}$, 7–6$^{(7–4)}$ win in the final against first-seeded Ivan Lendl.

## Seeds

* Ivan Lendl (final)
* Thomas Muster (first round)
* Emilio Sánchez (second round)
* Goran Ivanišević (first round)
* Andrei Chesnokov (second round)
* Jonas Svensson (first round)
* Jakob Hlasek (quarterfinals)
* Karel Nováček (quarterfinals)

## Draws
### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Ivan Lendl | 7 | 6 | | | | | | |
| | Anders Järryd | 5 | | | | | | | |
| | Anders Järryd | 5 | | | 1 | Ivan Lendl | 6 | 6 | 6 |
| | | | | | | Omar Camporese | 3 | 7 | 7 |
| | Paul Haarhuis | 7 | 2 | 6 | | Omar Camporese | 3 | 7 | 7 |
| | Omar Camporese | 6 | 6 | 7 | | | | | |

### Upper half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | Ivan Lendl | 6 | 6 | | | | | | | | | | | | | | | | |
| | Tom Nijssen | 3 | 1 | | | | | | | | | | | | | | | | |
| | Tom Nijssen | 3 | 1 | | 1 | Ivan Lendl | 6 | 6 | | | | | | | | | | | |
| | | | | | | Nicklas Kulti | 4 | 0 | | | | | | | | | | | |
| | Nicklas Kulti | 6 | 6 | | | Nicklas Kulti | 4 | 0 | | | | | | | | | | | |
| | Christian Saceanu | 2 | 4 | | | | | | | | | | | | | | | | |
| | Christian Saceanu | 2 | 4 | | | | | | | 1 | Ivan Lendl | 3 | 6 | 7 | | | | | |
| | | | | | | | | | | 7 | Jakob Hlasek | 6 | 3 | 5 | | | | | |
| Q | Slava Doseděl | 7 | 5 | 7 | | | | | | | | | | | 7 | Jakob Hlasek | 6 | 3 | 5 | | | |
| | Henri Leconte | 5 | 7 | 6$^3$ | | | | | | | | | | | | | | | |
| | Henri Leconte | 5 | 7 | 6$^3$ | Q | Slava Doseděl | 3 | 4 | | | | | | | | | | | |
| | | | | | 7 | Jakob Hlasek | 6 | 6 | | | | | | | | | | | |
| WC | Pat Cash | 2 | 4 | | 7 | Jakob Hlasek | 6 | 6 | | | | | | | | | | | |
| 7 | Jakob Hlasek | 6 | 6 | | | | | | | | | | | | | | | | |
| 7 | Jakob Hlasek | 6 | 6 | | | | | | | | | | | | | 1 | Ivan Lendl | 7 | 6 |
| | | | | | | | | | | | | | | | | | Anders Järryd | 5 | 4 |
| 3 | Emilio Sánchez | 6 | 6 | | | | | | | | | | | | | | | | | Anders Järryd | 5 | 4 |
| Q | Libor Pimek | 3 | 3 | | | | | | | | | | | | | | | | |
| Q | Libor Pimek | 3 | 3 | | 3 | Emilio Sánchez | 2 | 2 | | | | | | | | | | | |
| | | | | | | Anders Järryd | 6 | 6 | | | | | | | | | | | |
| | Amos Mansdorf | 4 | 2 | | | Anders Järryd | 6 | 6 | | | | | | | | | | | |
| | Anders Järryd | 6 | 6 | | | | | | | | | | | | | | | | |
| | Anders Järryd | 6 | 6 | | | | | | | | Anders Järryd | 7 | 6 | | | | | | |
| | | | | | | | | | | | Jan Siemerink | 6$^5$ | 2 | | | | | | |
| | Mark Koevermans | 6 | 4 | 2 | | | | | | | | | | | | Jan Siemerink | 6$^5$ | 2 | | | | |
| | Jan Siemerink | 3 | 6 | 6 | | | | | | | | | | | | | | | |
| | Jan Siemerink | 3 | 6 | 6 | | Jan Siemerink | 4 | 6 | 6 | | | | | | | | | | |
| | | | | | 5 | Andrei Chesnokov | 6 | 3 | 2 | | | | | | | | | | |
| WC | Richard Krajicek | 4 | 3 | | 5 | Andrei Chesnokov | 6 | 3 | 2 | | | | | | | | | | |
| 5 | Andrei Chesnokov | 6 | 6 | | | | | | | | | | | | | | | | |

### Lower half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | Jonas Svensson | 5 | 6 | 3 | | | | | | | | | | | | | | |
| | Paul Haarhuis | 7 | 0 | 6 | | | | | | | | | | | | | | |
| | Paul Haarhuis | 7 | 0 | 6 | | Paul Haarhuis | 6 | 3 | 6 | | | | | | | | | |
| | | | | | | Magnus Gustafsson | 3 | 6 | 1 | | | | | | | | | |
| | Jordi Arrese | 1 | 0 | r | | Magnus Gustafsson | 3 | 6 | 1 | | | | | | | | | |
| | Magnus Gustafsson | 6 | 3 | | | | | | | | | | | | | | | |
| | Magnus Gustafsson | 6 | 3 | | | | | | | | Paul Haarhuis | 7 | 6 | | | | | |
| | | | | | | | | | | | Christian Bergström | 5 | 3 | | | | | |
| | Magnus Larsson | 6 | 4 | 6 | | | | | | | | | | Christian Bergström | 5 | 3 | | | | | | |
| WC | Michiel Schapers | 4 | 6 | 4 | | | | | | | | | | | | | | |
| WC | Michiel Schapers | 4 | 6 | 4 | | Magnus Larsson | 2 | 5 | | | | | | | | | | |
| | | | | | | Christian Bergström | 6 | 7 | | | | | | | | | | |
| | Christian Bergström | 7 | 7 | | | Christian Bergström | 6 | 7 | | | | | | | | | | |
| 4 | Goran Ivanišević | 6$^3$ | 6$^4$ | | | | | | | | | | | | | | | |
| 4 | Goran Ivanišević | 6$^3$ | 6$^4$ | | | | | | | | | | | | Paul Haarhuis | 7 | 2 | 6$^2$ |
| | | | | | | | | | | | | | | | Omar Camporese | 6$^5$ | 6 | 7 |
| 8 | Karel Nováček | 6 | 6 | | | | | | | | | | | | | | | | Omar Camporese | 6$^5$ | 6 | 7 |
| | Ronald Agénor | 3 | 1 | | | | | | | | | | | | | | | |
| | Ronald Agénor | 3 | 1 | | 8 | Karel Nováček | 6$^4$ | 6 | 6 | | | | | | | | | |
| | | | | | | Javier Sánchez | 7 | 3 | 3 | | | | | | | | | |
| | Javier Sánchez | 6 | 6 | | | Javier Sánchez | 7 | 3 | 3 | | | | | | | | | |
| | Todd Woodbridge | 1 | 4 | | | | | | | | | | | | | | | |
| | Todd Woodbridge | 1 | 4 | | | | | | | 8 | Karel Nováček | 4 | 5 | | | | | |
| | | | | | | | | | | | Omar Camporese | 6 | 7 | | | | | |
| | Eric Jelen | 2 | 6 | 2 | | | | | | | | | | Omar Camporese | 6 | 7 | | | | | | |
| | Omar Camporese | 6 | 2 | 6 | | | | | | | | | | | | | | |
| | Omar Camporese | 6 | 2 | 6 | | Omar Camporese | 6 | 6 | | | | | | | | | | |
| | | | | | | Alex Antonitsch | 3 | 4 | | | | | | | | | | |
| | Alex Antonitsch | 2 | 7 | 6 | | Alex Antonitsch | 3 | 4 | | | | | | | | | | |
| 2 | Thomas Muster | 6 | 5 | 2 | | | | | | | | | | | | | | |