Michael Phelps , United States, 1:42.96 (new world record)
http://news.xinhuanet.com/english/2008-08/12/content_9197831.htm
Aaron Peirsol of the United States celebrates after winning the men's 100m backstroke final at the Beijing 2008 Olympic Games in the National Aquatics Center, also known as the Water Cube in Beijing, China, Aug. 12, 2008. Peirsol set a new world record and won the gold medal in the event with 52.54 seconds. (Xinhua/Chen Kai)