Michael Phelps of the United States smiles during the awarding ceremony of the Men's 4X100M Medlay Relay final at the Beijing 2008 Olympic Games in the National Aquatics Center, also known as the Water Cube in Beijing, China, Aug. 17, 2008. Phelps won his eighth gold medal at the Beijing Olympics swimming events on Sunday, breaking Mark Spitz's record of seven gold medals won at a single Games in 1972. (Xinhua/Chen Kai)

Family members of US swimmer Michael Phelps react after his team winning the men's 4x100m medley relay final at the Beijing 2008 Olympic Games in the National Aquatics Center, also known as the Water Cube in Beijing, China, Aug. 17, 2008. Phelps won his eighth gold medal at the Beijing 2008 Olympic Games with the help of his teammates with 3 minutes 29.34 seconds. (Xinhua/Wang Dingchang)

Michael Phelps of the United States kisses his sister after his team winning the men's 4x100m medley relay final at the Beijing 2008 Olympic Games.