1990 Athens Open
| 1990 Athens Open | |
|---|---|
| Date | 1 – 7 October |
| Edition | 5th |
| Category | World Series |
| Prize money | $125,000 |
| Surface | Clay / Outdoor |
| Location | Athens, Greece |
| Champions | |
| Singles | |
 Mark Koevermans
|
|
| Doubles | |
 Sergio Casal / Javier Sánchez
|
|
The 1990 ATP Athens Open was a men's tennis tournament played on outdoor clay courts in Athens in Greece that was part of the World Series of the 1990 ATP Tour. It was held from 1 October through 7 October 1990. Seventh-seeded Mark Koevermans won the singles title.
Mark Koevermans defeated 
Franco Davín 5–7, 6–4, 6–1
Sergio Casal / Javier Sánchez defeated Tom Kempers / Richard Krajicek 6–4, 6–3
...
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