| Singles | |
|---|---|
| 1989 Athens Open | |
| Champion |  Ronald Agénor |
| Runner-up |  Kent Carlsson |
| Final score | 6–3, 6–4 |
| Draw | 32 |
| Seeds | 8 |
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.
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)| Semifinals | Final | ||||||||||||
| 1 | Kent Carlsson | 6 | 5 | 6 | |||||||||
| Josef Čihák | 2 | 7 | 4 | ||||||||||
| 1 | Kent Carlsson | 3 | 4 | ||||||||||
| 2 | Ronald Agénor | 6 | 6 | ||||||||||
 Franco Davín | 6 | 3 | 5 | ||||||||||
| 2 | Ronald Agénor | 4 | 6 | 7 | |||||||||
| First round | Second round | Quarterfinals | 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 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | ||||||||||||||||||||||||
Mats Wilander defeated Henri Leconte in the final, 7–5, 6–2, 6–1 to win the men's singles tennis title at the 1988 French Open. It was his third and final French Open singles title. Leconte remains the most recent Frenchman to reach the final.
Jordi Arrese defeated Juan Aguilera 6–2, 6–2 in the final to secure the title.
Ivan Lendl was the defending champion but did not compete that year.
Ivan Lendl was the defending champion but did not compete that year.
Henri Leconte was the defending champion but lost in the second round to Goran Ivanišević.
Henri Leconte was the champion of the event when it last took place, in 1988. He participated in 1990 but lost in the first round.
Boris Becker won the title, defeating Carl-Uwe Steeb 7–5, 6–2, 6–2, in the final.
Ronald Agénor was the defending champion, but did not participate this year.
Henrik Sundström was the defending champion but did not participate this year.
John McEnroe was the defending champion, but did not participate this year.
Claudio Mezzadri was the defending champion, but lost in the second round this year.
Mats Wilander was the defending champion, but lost in the third round to Ronald Agénor.
Miloslav Mečíř was the defending champion, but lost in the third round to Thomas Muster.
Yannick Noah was the defending champion, but did not compete this year.
Hans Gildemeister and Víctor Pecci were the defending champions, but Pecci did not compete this year.
Andrei Medvedev was the defending champion, but lost in the second round to Ronald Agénor.
Emilio Sánchez was the defending champion but chose to compete at Hilversum in the same week, winning that tournament.
Sergi Bruguera was the defending champion, but did not compete this year.
No defending champions were officially declared as the last edition dates back to 1976, which was won by Lars Elvstrøm.
Magnus Gustafsson was the defending champion, but lost in the second round to Tomás Carbonell.
Andreas Maurer was the defending champion, but lost in the semifinals to Joakim Nyström.