Pedzisa mutsara unotevera:
100 m freestyle yevarume pa 2000 Summer Olympics muSydney. Akagamuchira nzvimbo yeUniversality kubva kuFINA, munguva yekupinda ye53.43. Akadenha vamwe vanoshambira vanomwe mumakwikwi matatu, kusanganisira George Bovell ane makore 16 okuberekwa wokuTrinidad neTobago uye Kenny Roberts wokuSeychelles uyo akahwina mitambo yeOlympic katatu. Akapedzisa mumunda wokupedzisira muna 54.06, masekondi 0.63 chete pasi pemwero wake wokutanga. Castellanos akakundikana kuenda kumasemifinal, sezvo akaisa makumi matanhatu nemana zvachose mumasekondi ekutanga.