# 1989 Athens Open – Singles

Horst Skoff was the defending champion but did not compete that year.
Ronald Agénor won in the final 6–3, 6–4 against Kent Carlsson.

## Seeds

* Kent Carlsson (final)
* Ronald Agénor (champion)
* Lawson Duncan (quarterfinals)
* Fernando Luna (first round)
* Andres Võsand (first round)
* Martin Střelba (quarterfinals)
* Ricki Osterthun (second round)
* Francesco Cancellotti (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 | Semifinals | Final | Final | Final | Final |
| 1 | Kent Carlsson | 6 | 5 | 6 | | | | |
| | Josef Čihák | 2 | 7 | 4 | | | | |
| | Josef Čihák | 2 | 7 | 4 | 1 | Kent Carlsson | 3 | 4 |
| | | | | | 2 | Ronald Agénor | 6 | 6 |
| | Franco Davín | 6 | 3 | 5 | 2 | Ronald Agénor | 6 | 6 |
| 2 | Ronald Agénor | 4 | 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 | Semifinals |
| 1 | K Carlsson | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | M Sinner | 2 | 0 | | 1 | K Carlsson | 6 | 7 | | | | | | | | | | | |
| | E Osta | 3 | 6 | 3 | | G Giussani | 4 | 6 | | | | | | | | | | | |
| | G Giussani | 6 | 2 | 6 | | | | | | 1 | K Carlsson | 6 | 2 | 6 | | | | | |
| Q | A de Minicis | 1 | 1 | | | | | | | | T Champion | 1 | 6 | 4 | | | | | |
| | T Champion | 6 | 6 | | | T Champion | 6 | 6 | | | | | | | | | | | |
| WC | S Bruguera | 3 | 2 | | 7 | R Osterthun | 3 | 3 | | | | | | | | | | | |
| 7 | R Osterthun | 6 | 6 | | | | | | | | | | | | 1 | K Carlsson | 6 | 5 | 6 |
| 4 | F Luna | 6 | 6 | 3 | | | | | | | | | | | | J Čihák | 2 | 7 | 4 |
| | J Čihák | 7 | 3 | 6 | | J Čihák | 6 | 6 | | | | | | | | | | | |
| Q | E Mazza | 5 | 2 | | | S Lochbihler | 3 | 3 | | | | | | | | | | | |
| | S Lochbihler | 7 | 6 | | | | | | | | J Čihák | 6 | 7 | | | | | | |
| | A Tous | 2 | 1 | | | | | | | 6 | M Střelba | 4 | 6 | | | | | | |
| | T Meinecke | 6 | 6 | | | T Meinecke | 6 | 6 | 4 | | | | | | | | | | |
| | T Šmíd | 6 | 5 | 1 | 6 | M Střelba | 4 | 7 | 6 | | | | | | | | | | |
| 6 | M Střelba | 2 | 7 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | A Võsand | 2 | 2 | | | | | | | | | | | | | | |
| Q | G Cosac | 6 | 6 | | Q | G Cosac | 2 | 0 | | | | | | | | | |
| | J Aguilera | 4 | 3 | | | F Davín | 6 | 6 | | | | | | | | | |
| | F Davín | 6 | 6 | | | | | | | F Davín | 6 | 6 | | | | | |
| | M Cierro | 6 | 6 | | | | | | 3 | L Duncan | 0 | 1 | | | | | |
| | M Rackl | 4 | 2 | | | M Cierro | 5 | 1 | | | | | | | | | |
| | J Colas | 3 | 6 | 3 | 3 | L Duncan | 7 | 6 | | | | | | | | | |
| 3 | L Duncan | 6 | 1 | 6 | | | | | | | | | | F Davín | 6 | 3 | 5 |
| 8 | F Cancellotti | 7 | 7 | | | | | | | | | | 2 | R Agénor | 4 | 6 | 7 |
| | C Miniussi | 5 | 6 | | 8 | F Cancellotti | 7 | 6 | | | | | | | | | |
| LL | P Ballauff | 6 | 3 | 2 | | R Azar | 5 | 4 | | | | | | | | | |
| | R Azar | 2 | 6 | 6 | | | | | 8 | F Cancellotti | 3 | 0 | | | | | |
| | C Panatta | 4 | 4 | | | | | | 2 | R Agénor | 6 | 6 | | | | | |
| | O Camporese | 6 | 6 | | | O Camporese | 5 | 3 | | | | | | | | | |
| WC | G Kalovelonis | 1 | 4 | | 2 | R Agénor | 7 | 6 | | | | | | | | | |
| 2 | R Agénor | 6 | 6 | | | | | | | | | | | | | | |