Dee ihe na-aga n'ihu maka paragraf a - Na 2012 Summer Olympics na London, Cielo kwụsịrị nke isii na 100 mita freestyle
, na oge nke 47.92 sekọnd. Ọlaedo gara Nathan Adrian (47.52 sekọnd), James Magnussen (47.53 sekọnd) na Brent Hayden (47.80 sekọnd). Na akara mita 50, Cielo nwere nke kachasị ọsọ na oge nke 22.60 sekọnd. Na 50 mita freestyle, ebe Cielo bụ ọkacha mmasị iji merie ọlaedo, ọ nọ n'ọkwa mbụ na ọkara ikpeazụ, jikọtara ya na Cullen Jones, na oge nke 21.54 sekọnd. Mana na ngwụcha, o jiri oge dị njọ karịa na agba nke ọkara, mana o jisiri ike nweta ihe nrite nke atọ ya n'egwuregwu Olympic, ọla nchara, na oge nke 21.59 sekọnd. Onye meriri bụ onye France bụ Florent Manaudou jiri oge 21.34 sekọnd. Ihe ndekọ Olympic nke Cielo nke 21.30 sekọnd setịpụrụ na 2008 ka na-ejide.