1990 Athens Open
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The 1990 ATP Athens Open was a 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 October 1 through October 8, 1990.
Champions
Men's Singles
Mark Koevermans defeated Franco Davín 5–7, 6–4, 6–1
- It was Koevermans' only title of the year and the 1st of his career.
Men's Doubles
Sergio Casal / Javier Sánchez defeated Tom Kempers / Richard Krajicek 6–4, 6–3
- It was Casal's 7th title of the year and the 32nd of his career. It was Sánchez's 4th title of the year and the 10th of his career.