Kammala wannan jumla: Youssef ya yi gasa ne kawai a cikin
maza 100 m freestyle, a matsayin mai shekaru 15 da haihuwa, a 2000 Summer Olympics a Sydney. Ya sami wuri na duniya daga FINA, ba tare da saduwa da lokacin shiga ba. Ya kalubalanci wasu 'yan wasa shida a zagaye na biyu, ciki har da dan shekaru 15 mai suna Ragi Edde na Lebanon. Ya kammala filin zuwa matsayi na karshe a cikin mafi kyawun lokaci na 1:02.45, kusan ragowar dakika tara daga jagora Gregory Arkhurst na Cote d'Ivoire. Youssef ya kasa ci gaba zuwa wasan kusa da na karshe, yayin da ya sanya na saba'in a gaba ɗaya a cikin prelims.