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In the women's section too, there was World Record made, when Katie Hoff clocked 4 minutes 31.12 seconds in the final of the women's 400-meter individual medley. Elizabeth Beisel finished second.
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In Phelps' race, Ryan Lochte finished in 4:06.08, with that also under the previous world mark. Phelps held the previous world record at 4:06.22, set at last year's world championships in Australia.
Michael Phelp is now eyeing on Mark Spitz's World Record of 7 gold medals in a single Olympic event, which he accomplised in 1972 Munich Olympics.