Rubuta ci gaba don wannan sakin layi - A Wasannin Olympics na bazara na 2012 a London, Sjöström ya yi gasa a cikin wasanni guda hudu, ya kai wasan kusa da na karshe na 50 m freestyle, 100 m freestyle da 200 m freestyle, kuma ya gama na 4 a wasan karshe na 100 m butterfly
a cikin lokaci na 57.17. Dana Vollmer ta Amurka ta karya rikodin duniya na Sjöström a cikin wannan tseren. A cikin 2015 duk da haka Sjöström ya dawo da tarihin duniya ta hanyar inganta shi sau biyu a Gasar Cin Kofin Duniya a Kazan.