# 1990 ATP German Open – Singles

Juan Aguilera defeated Boris Becker in the final, 6–1, 6–0, 7–6$^{(9–7)}$ to win the singles tennis title at the 1990 Hamburg European Open.
Ivan Lendl was the reigning champion, but did not compete this year.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top eight seeds received a bye to the second round.
* Boris Becker (final)
* Andre Agassi (third round)
* Aaron Krickstein (third round)
* Emilio Sánchez (third round)
* Jay Berger (quarterfinals)
* Andrés Gómez (second round)
* Michael Chang (second round)
* Andrei Cherkasov (withdrew)
* Martín Jaite (first round)
* Jim Courier (third round)
* Carl-Uwe Steeb (second round)
* Thomas Muster (withdrew)
* Horst Skoff (first round)
* Guillermo Pérez Roldán (first round)
* Magnus Gustafsson (quarterfinals)
* Alberto Mancini (first round)

## 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 | Semifinals | Final | Final | Final | Final | Final |
| 1 | Boris Becker | 6 | 3 | 6 | | | | | |
| WC | Henri Leconte | 3 | 6 | 3 | | | | | |
| WC | Henri Leconte | 3 | 6 | 3 | 1 | Boris Becker | 1 | 0 | 6 |
| | | | | | | Juan Aguilera | 6 | 6 | 7 |
| | Guy Forget | 5 | 6 | | | Juan Aguilera | 6 | 6 | 7 |
| | Juan Aguilera | 7 | 7 | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | B Becker | 7 | 6 | | | | | | | | | |
| | K Curren | 6 | 4 | | | P Canè | 5 | 1 | | | | | | | | | |
| | P Canè | 7 | 6 | | | | | | | 1 | B Becker | 6 | 6 | | | | |
| WC | M Zoecke | 2 | 2 | | | | | | | | A Cherkasov | 2 | 3 | | | | |
| | A Cherkasov | 6 | 6 | | | A Cherkasov | 6 | 6 | | | | | | | | | |
| WC | J Wöhrmann | 6 | 6 | | WC | J Wöhrmann | 4 | 1 | | | | | | | | | |
| 16 | A Mancini | 0 | 2 | | | | | | | | | | | 1 | B Becker | 6 | 6 |
| 9 | M Jaite | 6 | 5 | 3 | | | | | | | | | | | J Arias | 3 | 1 |
| | J Arias | 3 | 7 | 6 | | J Arias | 6 | 2 | 6 | | | | | | | | |
| | J Hlasek | 7 | 6 | | | J Hlasek | 4 | 6 | 2 | | | | | | | | |
| | M Stich | 6 | 4 | | | | | | | | J Arias | 6 | 6 | | | | |
| Q | J Apell | 1 | 2 | | | | | | | LL | L Jönsson | 1 | 2 | | | | |
| WC | U Riglewski | 6 | 6 | | WC | U Riglewski | 0 | 4 | | | | | | | | | |
| | | | | | LL | L Jönsson | 6 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | A Krickstein | 7 | 6 | | | | | | | | | |
| | J Yzaga | 6 | 6 | | | J Yzaga | 6 | 2 | | | | | | | | | |
| | M Šrejber | 2 | 3 | | | | | | | 3 | A Krickstein | 4 | 4 | | | | |
| | T Witsken | 6 | 6 | 2 | | | | | | WC | H Leconte | 6 | 6 | | | | |
| WC | H Leconte | 7 | 2 | 6 | WC | H Leconte | 6 | 1 | 6 | | | | | | | | |
| | J Arrese | 3 | | | | J Arrese | 4 | 6 | 2 | | | | | | | | |
| 13 | H Skoff | 1$^r$ | | | | | | | | | | | | WC | H Leconte | 6 | 6 |
| LL | F Davín | 7 | 6 | | | | | | | | | | | LL | F Davín | 3 | 3 |
| Q | C Bergström | 5 | 2 | | LL | F Davín | 6 | 2 | 6 | | | | | | | | |
| | E Jelen | 5 | 4 | | | R Agénor | 3 | 6 | 2 | | | | | | | | |
| | R Agénor | 7 | 6 | | | | | | | LL | F Davín | 6 | 6 | | | | |
| | L Mattar | 6 | 7 | | | | | | | | L Mattar | 0 | 2 | | | | |
| Q | C Pistolesi | 4 | 5 | | | L Mattar | 6 | 7 | 6 | | | | | | | | |
| | | | | | 6 | A Gómez | 7 | 6 | 3 | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | J Berger | 6 | 6 | | | | | | | | | | | |
| WC | P Kühnen | 6 | 6 | 6 | WC | P Kühnen | 2 | 2 | | | | | | | | | | | |
| Q | T Champion | 7 | 2 | 4 | | | | | | 5 | J Berger | 3 | 6 | 6 | | | | | |
| Q | R Azar | 7 | 1 | 6 | | | | | | Q | R Azar | 6 | 2 | 3 | | | | | |
| | J-P Fleurian | 6 | 6 | 4 | Q | R Azar | 6 | 4 | 7 | | | | | | | | | | |
| | J Sánchez | 4 | 6 | 4 | 11 | C-U Steeb | 2 | 6 | 5 | | | | | | | | | | |
| 11 | C-U Steeb | 6 | 2 | 6 | | | | | | | | | | | 5 | J Berger | 3 | 6 | 4 |
| 14 | G Pérez Roldán | 0 | 3 | | | | | | | | | | | | | G Forget | 6 | 3 | 6 |
| | G Prpić | 6 | 6 | | | G Prpić | 6 | 6 | 4 | | | | | | | | | | |
| | G Forget | 6 | 7 | | | G Forget | 7 | 3 | 6 | | | | | | | | | | |
| | K Nováček | 4 | 5 | | | | | | | | G Forget | 7 | 6 | | | | | | |
| | P Korda | 2 | 6 | 6 | | | | | | 4 | E Sánchez | 6 | 4 | | | | | | |
| Q | F Santoro | 6 | 3 | 7 | Q | F Santoro | 6 | 1 | 1 | | | | | | | | | | |
| | | | | | 4 | E Sánchez | 4 | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | M Chang | 3 | 2 | | | | | | | | | | |
| | G Ivanišević | 4 | 1 | | | J Aguilera | 6 | 6 | | | | | | | | | | |
| | J Aguilera | 6 | 6 | | | | | | | | J Aguilera | 1 | 6 | 6 | | | | |
| | P Haarhuis | 6 | 6 | | | | | | | 10 | J Courier | 6 | 4 | 4 | | | | |
| | A Mansdorf | 0 | 3 | | | P Haarhuis | 1 | 1 | | | | | | | | | | |
| | J Gunnarsson | 7 | 4 | 2 | 10 | J Courier | 6 | 6 | | | | | | | | | | |
| 10 | J Courier | 6 | 6 | 6 | | | | | | | | | | | | J Aguilera | 6 | 6 |
| 15 | M Gustafsson | 6 | 6 | | | | | | | | | | | | 15 | M Gustafsson | 1 | 4 |
| | S Bruguera | 2 | 4 | | 15 | M Gustafsson | 6 | 5 | 6 | | | | | | | | | |
| | A Volkov | 2 | 5 | | | M Filippini | 3 | 7 | 3 | | | | | | | | | |
| | M Filippini | 6 | 7 | | | | | | | 15 | M Gustafsson | 7 | 7 | | | | | |
| Q | D Pérez | 6 | 3 | 7 | | | | | | 2 | A Agassi | 6 | 6 | | | | | |
| | J Svensson | 3 | 6 | 6 | Q | D Pérez | 1 | 0 | r | | | | | | | | | |
| | | | | | 2 | A Agassi | 6 | 1 | | | | | | | | | | |