Rubuta ci gaba don wannan sakin layi - Ngouabi ya yi gasa ne kawai a tseren tseren maza na mita 100
a wasannin Olympics na shekara ta 2000 a Sydney. Ya sami wuri na duniya daga FINA, a cikin lokacin shigarwa na 59.50. Ya kalubalanci wasu 'yan wasa shida a zagaye na biyu, ciki har da Ragi Edde mai shekaru 15 daga Lebanon da Dawood Youssef na Bahrain. Ya janye kansa daga saman filin zuwa na shida a cikin 1:00.39, kusan cikakken na biyu a ƙasa da matsayin shigarsa da sakan 6.84 a bayan jagora Gregory Arkhurst na Cote d'Ivoire. Ngouabi ya kasa ci gaba zuwa wasan kusa da na karshe, yayin da ya sanya na sittin da takwas a cikin prelims.