Michael Phelps picked up his fifth gold medal as the United States won the men's 4x100m medley relay in a world record time. The American quartet of Aaron Peirsol, Eric Shanteau, Phelps and David Walters finished first in 3 minutes 27.58 seconds, breaking the old standard set by the US in winning Olympic gold in Beijing.

Germany finished second with Australia third.It was also a big day for Phelps' teammate Ryan Lochte. He completed the individual medley double by winning the men's 400m that gave him the fourth gold.Britain's Liam Tancock bettered his own world record to win the men's 50 meter backstroke final.

Tancock clocked 24.04 seconds with Japan's Junya Koga finishing second and South Africa's Gerhard Zandberg third. In the women's event. Germany's Britta Steffen claimed the 50m freestyle gold in a world record time of 23.73 seconds. Hungarian Katinka Hosszu triumphed in the women's 400m individual medley final.

(CCTV August 3, 2009)