Completed the following sentence: At the 2012 Summer Olympics in London, Sjöström competed in four individual events, reaching the semi-finals of the
50 m freestyle, 100 m freestyle and 200 m freestyle, and finishing 4th in the final of the 100 m butterfly in a time of 57.17. Sjöström<unk>s<unk> world<unk> record<unk> was<unk> broken<unk> in<unk> this<unk> race<unk> by<unk> Dana<unk> Vollmer<unk> of<unk> the<unk> United States. ️<unk>️<unk>️<unk>️<unk>️<unk>️