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
Finals
Top half
Bottom half
External links 1989 Grand Prix Athens Open Draw