Mezue ahịrịokwu na-esonụ: Mgbe nke ahụ gasịrị, Cielo gara asọmpi Olimpik nke Oge Ezumike nke 2008 na Beijing, ebe o mebiri ihe ndekọ Amerịka n'ọsọ ọsọ 4×100 mita n'egwuregwu onwe onye, na oge nke 47.91 sekọnd. Ọ bụ ezie na a chụrụ ndị otu Brazil n'asọmpi ahụ, e kwere ka ndekọ Cielo guzo. N'ime
Na 100 mita freestyle, Cielo tozuru oke maka ikpeazu, na-ewere ọnọdụ nke asatọ na ọkụ, na oge nke 48.07 sekọnd. Cielo pụtara ìhè na mmalite nke ọkara ikpeazu nke mbụ, na-eme ya na nke abụọ, na 22.62 sekọnd, ma na-agwụ nke ise. N'ikpeazụ, Cielo nakweere usoro dị iche, na-agbanye nke atọ, nwayọ (22.74 sekọnd) karịa na ọkara ikpeazụ, ma na-echekwa ike maka njedebe, nke mere ka o merie ọla nchara ma mebie ndekọ South America na oge 47.67 sekọnd (ejikọtara ya na onye na-egwu mmiri America Jason Lezak). Alain Bernard ritere ọlaedo na Eamon Sullivan ritere ọlaọcha. N'oge na-adịghị anya mgbe o merisịrị nrite ọla nchara, Cielo nyere nkwupụta nye ndị nta akụkọ Brazil, na-ekwupụta n'ụzọ doro anya: "Ugbu a, m ga-emeri 50m". Na ihe omume 50 mita freestyle, Cielo setịpụrụ ihe ndekọ Olympic, nke Alexander Popov setịpụrụ na 1992 Summer Olympics, n'oge ọkụ (21.47 sekọnd, na-eme ka Garrett Weber-Gale's Americas ndekọ) na na ọkara ikpeazụ (21.34 sekọnd). Ọ wedara nke a n'ihu na ngwụcha, ọzọ mebiri ndekọ Olympic na oge nke 21.30 sekọnd, na-emeri ihe nrite ọla edo ma na-efu ndekọ ụwa site na 0.02 sekọnd. Site na nke a, ọ ghọrọ onye mmeri igwu mmiri Olympic mbụ nke Brazil. Ruo mgbe Cielo nwetara ọla edo n'egwuregwu Olympic, ihe kacha mma ndị Brazil na-egwu mmiri n'egwuregwu Olympic nwetara bụ Ricardo Prado, onye meriri ọla ọcha na 400-mita medley na 1984 Summer Olympics, na Gustavo Borges, onye meriri ọla ọcha na 100 mita freestyle na 1992 Summer Olympics na 200 mita freestyle na 1996 Summer Olympics.