Mezue ahịrịokwu na-esonụ: Na 2012 Summer Olympics na London, Sjöström osompi na anọ onye ihe, na-eru ọkara-ikpeazụ nke 50 m freestyle, 100 m freestyle na 200 m freestyle, na-emecha 4th na ikpeazụ 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.