Vollmer wins gold in record time - London 2012 - Swimming
USA's Dana Vollmer won the Olympic Games 100m Butterfly title in a new world record of 55.98.
Vollmer had been the favourite coming into the final having set an Olympic record yesterday, a year after being crowned world champion in Shanghai.
Lu Ying of China was second in 56.87, with Australia's Alicia Coutts third 0.07 adrift.
Meanwhile, South African Cameron van der Burgh has won gold in the men's 100m Breaststroke in a world record time of 58.46.
The 24-year-old had qualified fastest for the final last night with the best time in the world in 2012 and an Olympic record.
Tonight he led from start to finish to take 0.12 off Brenton Rickard's 2009 record.
Christian Sprenger was second and Brendan Hansen third.