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 DavÃÂn 5âÂÂ7, 6âÂÂ4, 6âÂÂ1
Sergio Casal / Javier Sánchez defeated Tom Kempers / Richard Krajicek 6âÂÂ4, 6âÂÂ3