Athletes dive during the men's 400m individual medley swimming heat at the National Aquatics CentrePhotograph: Martin Bureau /AFPLaszlo Cseh of Hungary competes in the heats of the men's 400m individual medley swimming competition at the National Aquatics CentrePhotograph: Wolfgang Rattay /ReutersLaszlo Cseh of Hungary competes in the heats of the men's 400m individual medley swimming competition at the National Aquatics Centre Photograph: David Gray /Reuters
France's Sebastien Rouault competes during the men's 400m freestyle swimming heat at the National Aquatics Centre Photograph: Francois-Xavier Marit/AFPAustralia's Grant Hackett competes during the men's 400m freestyle swimming heat at the National Aquatics Centre Photograph: Francois-Xavier Marit/AFPUS swimmer Michael Phelps competes during the men's 400m individual medley swimming heat at the National Aquatics Centre Photograph: Timothy Clary /AFPUS swimmer Michael Phelps competes during the men's 400m individual medley swimming heat at the National Aquatics Centre. Phelps placed first in the eventPhotograph: Timothy Clary /AFPMichael Phelps of the US rests after competing in the heats of the men's 400m individual medley swimming competition at the National Aquatics Centre Photograph: David Gray /ReutersItaly's Massimiliano Rosolino swims in a men's 400m freestyle heat during the swimming competitions in the National Aquatics Centre Photograph: Itsuo Inouye/APUS swimmer Larsen Jensen celebrates after the men's 400m freestyle swimming heat 4 at the National Aquatics CenterPhotograph: Greg Wood/AFPKatie Hoff of the US starts her women's 400m individual medley swimming heat at the National Aquatics Centre Photograph: Jerry Lampen /ReutersUS swimmer Katie Hoff competes during the women's 400m individual medley swimming heat at the National Aquatics Centre. Hoff swam the second fastest time in the heatsPhotograph: Timothy Clary /AFPKatie Hoff of the US (top) and Hannah Miley of Britain swim in their women's 400m individual medley swimming heat at the National Aquatics Centre Photograph: Jerry Lampen /ReutersSpain's Mireia Belmonte swims in a women's 400m individual medley heat during the swimming competitions in the National Aquatics Centre Photograph: Itsuo Inouye/APUS swimmer Elizabeth Beisel looks at the screen after winning the women's 400m individual medley swimming heat 3 at the National Aquatics Center Photograph: Greg Wood/AFPJoanna Maranhao of Brazil celebrates after winning her women's 400m individual medley swimming heat at the National Aquatics Centre Photograph: Jerry Lampen /Reuters
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