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Swimmers dive in for a heat of the men's 400-meter individual medley in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 9, 2008. (AP Photo/Bob Bukaty)

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United States' Ryan Lochte competes in a men's 400-meter individual medley heat during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 9, 2008. (AP Photo/Mark J. Terrill)

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U.S. Michael Phelps swims in a men's 400-meter individual medley heat during the swimming competitions in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 9, 2008. (AP Photo/Itsuo Inouye)

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Grant Hackett of Australia takes a breath during a heat of the men's 400-meter freestyle in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug.9, 2008. (AP Photo/Rick Rycroft)

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Grant Hackett of Australia takes a breath after finishing a heat of the men's 400-meter freestyle in the National Aquatics Center at the Beijing 2008 Olympics in Beijing, Saturday, Aug. 9, 2008. (AP Photo/Mark J. Terrill)

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Venu en Chine avec l'objectif de remporter huit médailles d'or, le nageur américain Michael Phelps a illuminé la première journée des Jeux de Pékin en améliorant son propre record olympique en série du 400 mètres quatre nages, signant le troisième meilleur temps de l'histoire en 4 minutes 7 secondes et 82 centièmes. /Photo prise le 9 août 2008/REUTERS/Kai Pfaffenbach