Aaron Peirsol established a new world record of 52.54 to defend his Olympic title in the event. His teammate Matt Grevers earned a silver in 53.11, giving the United States a one-two finish.[2][3] Meanwhile, Australia's Hayden Stoeckel and Russia's Arkady Vyatchanin, who both finished behind Grevers by 0.07 of a second, tied for the bronze medal in a matching time of 53.18.[4]
Stoeckel's teammate Ashley Delaney finished fifth in 53.31, while Great Britain's Liam Tancock, who led a field in the first 50 metres, faded only to sixth place in 53.39.[5] Spain's Aschwin Wildeboer (53.51) and Japan's Junichi Miyashita (53.99) rounded out the finale. For the first time in Olympic history, all eight swimmers went faster than a winning time of 54.09, previously set by Peirsol in Athens four years earlier.[2]
Earlier, Grevers erased Peirsol's 2004 Olympic record of 53.45 to pick up a top seed in the prelims, until Stoeckel broke a 53-second barrier, and eventually lowered the record to 52.97 in the semifinals.[6]
Records
Prior to this competition, the existing world and Olympic records were as follows.