# 1989 Mercedes Cup – Singles

Andre Agassi was the defending champion, but did not compete this year.
Martín Jaite won the title by defeating Goran Prpić 6–3, 6–2 in the final.

## Seeds

All seeds received a bye into the second round.
* Jakob Hlasek (second round)
* Alberto Mancini (third round)
* Aaron Krickstein (third round)
* Kevin Curren (third round)
* Miloslav Mečíř (second round)
* Mikael Pernfors (third round)
* Guillermo Pérez Roldán (quarterfinals)
* Sergi Bruguera (semifinals)
* John Fitzgerald (second round)
* Andrés Gómez (second round)
* Ronald Agénor (third round)
* Jordi Arrese (quarterfinals)
* Darren Cahill (second round)
* Martín Jaite (champion)
* Alexander Volkov (second round)
* Jan Gunnarsson (third 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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| WC | Jens Wöhrmann | 6 | 6 | | | | | | | | | | |
| 7 | Guillermo Pérez Roldán | 3 | 3 | | | | | | | | | | |
| 7 | Guillermo Pérez Roldán | 3 | 3 | | WC | Jens Wöhrmann | 7 | 4 | 3 | | | | |
| | | | | | 14 | Martín Jaite | 5 | 6 | 6 | | | | |
| 14 | Martín Jaite | 3 | 7 | 6 | 14 | Martín Jaite | 5 | 6 | 6 | | | | |
| 12 | Jordi Arrese | 6 | 5 | 4 | | | | | | | | | |
| 12 | Jordi Arrese | 6 | 5 | 4 | | | | | | 14 | Martín Jaite | 6 | 6 |
| | | | | | | | | | | | Goran Prpić | 3 | 2 |
| | Goran Prpić | 7 | 6 | 6 | | | | | | | | | | Goran Prpić | 3 | 2 |
| | Alex Antonitsch | 6 | 7 | 3 | | | | | | | | | |
| | Alex Antonitsch | 6 | 7 | 3 | | Goran Prpić | 3 | 7 | 6 | | | | |
| | | | | | 8 | Sergi Bruguera | 6 | 5 | 1 | | | | |
| 8 | Sergi Bruguera | 6 | 6 | | 8 | Sergi Bruguera | 6 | 5 | 1 | | | | |
| | Martin Wostenholme | 1 | 4 | | | | | | | | | | |

### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | J Hlasek | 4 | 6 | 3 | | | | | | | | | |
| WC | J Wöhrmann | 6 | 4 | 7 | WC | J Wöhrmann | 6 | 4 | 6 | | | | | | | | | |
| | B Orešar | 2 | 6 | 6 | | | | | | WC | J Wöhrmann | 6 | 6 | | | | | |
| Q | M Ostoja | 4 | 3 | | | | | | | 16 | J Gunnarsson | 4 | 4 | | | | | |
| | F Cancellotti | 6 | 6 | | | F Cancellotti | 1 | 6 | 3 | | | | | | | | | |
| | | | | | 16 | J Gunnarsson | 6 | 3 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | WC | J Wöhrmann | 6 | 6 |
| | | | | | | | | | | | | | | | 7 | G Pérez Roldán | 3 | 3 |
| | | | | | 10 | A Gómez | 6 | 6 | 6 | | | | | | | | | |
| Q | M Zillner | 6 | 3 | | Q | F Santoro | 7 | 2 | 7 | | | | | | | | | |
| Q | F Santoro | 7 | 6 | | | | | | | Q | F Santoro | 1 | 6 | 3 | | | | |
| | S Colombo | 1 | 7 | 6 | | | | | | 7 | G Pérez Roldán | 6 | 3 | 6 | | | | |
| | O Delaître | 6 | 6 | 1 | | S Colombo | 1 | 6 | | | | | | | | | | |
| | | | | | 7 | G Pérez Roldán | 6 | 7 | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | A Krickstein | 6 | 6 | | | | | | | | | | |
| Q | S Doseděl | 0 | 7 | 2 | Q | L Koslowski | 2 | 3 | | | | | | | | | | |
| Q | L Koslowski | 6 | 5 | 6 | | | | | 3 | A Krickstein | 1 | 6 | 2 | | | | | |
| | L Duncan | 0 | 6 | 3 | | | | | 14 | M Jaite | 6 | 4 | 6 | | | | | |
| Q | P Korda | 6 | 0 | 6 | Q | P Korda | 3 | 1 | | | | | | | | | | |
| | | | | | 14 | M Jaite | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 14 | M Jaite | 3 | 7 | 6 |
| | | | | | | | | | | | | | | 12 | J Arrese | 6 | 5 | 4 |
| | | | | | 12 | J Arrese | 6 | 6 | | | | | | | | | | |
| | T Tulasne | 7 | 7 | | | T Tulasne | 0 | 4 | | | | | | | | | | |
| WC | T Šmíd | 6 | 6 | | | | | | 12 | J Arrese | 6 | 6 | | | | | | |
| | M Davis | 6 | 6 | 1 | | | | | 6 | M Pernfors | 4 | 3 | | | | | | |
| | A Cherkasov | 1 | 7 | 6 | | A Cherkasov | 5 | 2 | | | | | | | | | | |
| | | | | | 6 | M Pernfors | 7 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| 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 |
| | | | | 5 | M Mečíř | 0 | 3 | | | | | | | | | | |
| C Motta | 3 | 2 | | | G Prpić | 6 | 6 | | | | | | | | | | |
| G Prpić | 6 | 6 | | | | | | | | G Prpić | 1 | 6 | 6 | | | | |
| M Stich | 7 | 6 | | | | | | | 11 | R Agénor | 6 | 4 | 1 | | | | |
| F Luna | 5 | 2 | | | M Stich | 6 | 1 | 4 | | | | | | | | | |
| | | | | 11 | R Agénor | 4 | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | G Prpić | 7 | 6 | 6 |
| | | | | | | | | | | | | | | A Antonitsch | 6 | 7 | 3 |
| | | | | 13 | D Cahill | 4 | 1 | | | | | | | | | | |
| S Matsuoka | 6 | 6 | 1 | | A Antonitsch | 6 | 6 | | | | | | | | | | |
| A Antonitsch | 7 | 3 | 6 | | | | | | | A Antonitsch | 5 | 6 | 6 | | | | |
| B Drewett | 3 | 2 | | | | | | | 4 | K Curren | 7 | 4 | 0 | | | | |
| H de la Peña | 6 | 6 | | | H de la Peña | 3 | 4 | | | | | | | | | | |
| | | | | 4 | K Curren | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | S Bruguera | 6 | 6 | | | | | | | | | |
| WC | M Sinner | 6 | 7 | | WC | M Sinner | 3 | 4 | | | | | | | | | |
| | É Winogradsky | 4 | 5 | | | | | | 8 | S Bruguera | 6 | 4 | 6 | | | | |
| | M Vajda | 3 | 6 | 6 | | | | | | M Vajda | 2 | 6 | 1 | | | | |
| WC | M Tideman | 6 | 1 | 2 | | M Vajda | 6 | 6 | | | | | | | | | |
| | | | | | 9 | J Fitzgerald | 0 | 4 | | | | | | | | | |
| | | | | | | | | | | | | | | 8 | S Bruguera | 6 | 6 |
| | | | | | | | | | | | | | | | M Wostenholme | 1 | 4 |
| | | | | | 15 | A Volkov | 4 | 5 | | | | | | | | | |
| | M Wostenholme | 6 | 7 | | | M Wostenholme | 6 | 7 | | | | | | | | | |
| | E Bengoechea | 3 | 6 | | | | | | | M Wostenholme | 6 | 6 | | | | | |
| | M Střelba | 6 | 6 | | | | | | 2 | A Mancini | 2 | 2 | | | | | |
| | M Filippini | 7 | 7 | | | M Filippini | 3 | 6 | | | | | | | | | |
| | | | | | 2 | A Mancini | 6 | 7 | | | | | | | | | |