United States' Michael Phelps celebrates winning the gold medal and setting a new world record in the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/Itsuo Inouye)

Michael Phelps of United States reacts after setting the world record to win the men's 400-meter individual medley during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/Mark J. Terrill)

United States' Michael Phelps concentrates before setting a new world record and winning the gold in the final of the men's 400-meter individual medley during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/David J. Phillip)

United States' Michael Phelps sticks out his tongue as he prepares for the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. Phelps won the gold medal. (AP Photo/Mark J. Terrill)

United States' Michael Phelps swims on his way to win the goal medal in the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/Mark J. Terrill)

United States' Michael Phelps swims to win the gold medal in the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 10, 2008. (AP Photo/Bob Bukaty)

United States' Michael Phelps swims on his way to winning the gold in the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 10, 2008. (AP Photo/Bob Bukaty)

United States' Michael Phelps swims to setting a new world record and winning the gold in the final of the men's 400-meter individual medley during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/David J. Phillip)

Michale Phelps of United States swims on his way to winning the gold medal by setting the world record in the men's 400-meter individual medley during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/Mark J. Terrill)

L'Américain Michael Phelps a remporté le titre de champion olympique du 400 m 4 nages devant le Hongrois Laszlo Cseh et l'Américain Ryan Lochte en améliorant son record du monde (4:03.84) aux Jeux de Pékin, dimanche.

United States' Michael Phelps shows his gold medal after setting a new world record in the men's 400-meter individual medley final during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Sunday, Aug. 10, 2008. (AP Photo/Itsuo Inouye)