<prompt> Pedzisa mutsara unotevera: Pamakwikwi eOlympics yeZhizha ya2012 muLondon, Sjöström akakwikwidza mumitambo mina yevanhu, achisvika kuma semi-fainari e  <response>: 50 m freestyle, 100 m freestyle uye 200 m freestyle, uye kupedza 4th mufainari ye100 m butterfly munguva ye57.17. Rekodhi yenyika yaSjöström yakaputswa munhangemutange iyi naDana Vollmer wokuUnited States. Muna 2015 zvisinei Sjöström akadzorera rekodhi yenyika nekuivandudza kaviri paWorld Championships muKazan. 