# 1990 ABN World Tennis Tournament – Singles

Jakob Hlasek was the defending champion, but lost in the semifinals to seventh seed Jonas Svensson. Brad Gilbert won the title, defeating Jonas Svensson 6–1, 6–3, in the final.

## Seeds

* Brad Gilbert (champion)
* Alberto Mancini (first round)
* Yannick Noah (first round)
* Carl-Uwe Steeb (second round)
* Magnus Gustafsson (quarterfinals)
* Jakob Hlasek (semifinals)
* Jonas Svensson (final)
* Amos Mansdorf (quarterfinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Brad Gilbert | 6 | 6 | | | | |
| | Michael Tauson | 3 | 3 | | | | |
| | Michael Tauson | 3 | 3 | 1 | Brad Gilbert | 6 | 6 |
| | | | | 7 | Jonas Svensson | 1 | 3 |
| 6 | Jakob Hlasek | 4 | 5 | 7 | Jonas Svensson | 1 | 3 |
| 7 | Jonas Svensson | 6 | 7 | | | | |

### Top 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 | B Gilbert | 7 | 4 | 6 | | | | | | | | | | | | | | |
| | A Cherkasov | 5 | 6 | 4 | 1 | B Gilbert | 6 | 6 | | | | | | | | | | |
| | O Camporese | 6 | 6 | | | O Camporese | 3 | 3 | | | | | | | | | | |
| | R Fromberg | 4 | 2 | | | | | | | 1 | B Gilbert | 6 | 7$^8$ | | | | | |
| WC | J Fitzgerald | 6$^3$ | 3 | | | | | | | 8 | A Mansdorf | 1 | 6$^6$ | | | | | |
| | C Bergström | 7$^7$ | 6 | | | C Bergström | 6 | 1 | 1 | | | | | | | | | |
| | A Järryd | 2 | 4 | | 8 | A Mansdorf | 4 | 6 | 6 | | | | | | | | | |
| 8 | A Mansdorf | 6 | 6 | | | | | | | | | | | | 1 | B Gilbert | 6 | 6 |
| 3 | Y Noah | 2 | 6$^4$ | | | | | | | | | | | | | M Tauson | 3 | 3 |
| | P Haarhuis | 6 | 7$^7$ | | | P Haarhuis | 6 | 3 | 6$^{10}$ | | | | | | | | | |
| | M Schapers | 6$^6$ | 5 | | | M Tauson | 2 | 6 | 7$^{12}$ | | | | | | | | | |
| | M Tauson | 7$^8$ | 7 | | | | | | | | M Tauson | 6 | 1 | 7$^7$ | | | | |
| | J Bates | 1 | 1 | | | | | | | 5 | M Gustafsson | 3 | 6 | 6$^4$ | | | | |
| WC | S Živojinović | 6 | 6 | | WC | S Živojinović | 3 | 3 | | | | | | | | | | |
| | J Potier | 5 | 2 | | 5 | M Gustafsson | 6 | 6 | | | | | | | | | | |
| 5 | M Gustafsson | 7 | 6 | | | | | | | | | | | | | | | |

### Bottom 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 |
| 6 | J Hlasek | 7$^{11}$ | 7$^7$ | | | | | | | | | | | | | | | |
| | E Jelen | 6$^9$ | 6$^5$ | | 6 | J Hlasek | 6 | 6 | | | | | | | | | | |
| | N Pereira | 6 | 6 | | | N Pereira | 2 | 3 | | | | | | | | | | |
| | M Koevermans | 4 | 2 | | | | | | | 6 | J Hlasek | 7 | 6 | | | | | |
| Q | L Jensen | 4 | 4 | | | | | | | | A Antonitsch | 5 | 1 | | | | | |
| | A Antonitsch | 6 | 6 | | | A Antonitsch | 6 | 4 | 6 | | | | | | | | | |
| Q | C Pioline | 4 | 4 | | 4 | C-U Steeb | 1 | 6 | 3 | | | | | | | | | |
| 4 | C-U Steeb | 6 | 6 | | | | | | | | | | | | 6 | J Hlasek | 4 | 5 |
| 7 | J Svensson | 7$^7$ | 6 | | | | | | | | | | | | 7 | J Svensson | 6 | 7 |
| | T Nijssen | 6$^1$ | 1 | | 7 | J Svensson | 7$^8$ | 7 | | | | | | | | | | |
| | K Nováček | 7$^7$ | 7$^7$ | | | K Nováček | 6$^6$ | 5 | | | | | | | | | | |
| Q | P Nyborg | 6$^3$ | 6$^4$ | | | | | | | 7 | J Svensson | 6 | 6$^5$ | 7 | | | | |
| | L-A Wahlgren | 4 | 1 | | | | | | | Q | T Högstedt | 3 | 7$^7$ | 5 | | | | |
| WC | A Rahunen | 6 | 6 | | WC | A Rahunen | 2 | 6$^6$ | | | | | | | | | | |
| Q | T Högstedt | 6$^6$ | 6 | 6 | Q | T Högstedt | 6 | 7$^8$ | | | | | | | | | | |
| 2 | A Mancini | 7$^8$ | 4 | 2 | | | | | | | | | | | | | | |