In 1999, El Aynaoui won his first top-level singles title in Amsterdam and the following year he reached the quarter-finals of the Australian Open where he lost to Yevgeny Kafelnikov.
1999. godine, El Aynaoui osvojia svoj ​​prvi top-level pojedinačni naslov u Amsterdamu, a sljedeće godine stiže u četvrtfinale Australian Opena u kojem je izgubio od Jevgenija Kafeljnikova.