Dee ihe na-aga n'ihu maka paragraf a - Na 2012 Summer Olympics na London, Sjöström gbara asọmpi na ihe omume anọ, na-eru ọkara nke ikpeazụ nke 50 m freestyle
, 100 m freestyle na 200 m freestyle, na imecha nke anọ na ngwụcha nke 100 m butterfly na oge nke 57.17. Onye meriri ihe ndekọ ụwa nke Sjöström n'ọsọ a bụ Dana Vollmer nke United States. Na 2015 agbanyeghị Sjöström nwetaghachiri ndekọ ụwa site na imeziwanye ya ugboro abụọ na World Championships na Kazan.