Katie Hoff beat Australia’s Stephanie Rice’s time of 4:31.46 with the new world record 4:31.12. And Phelps bettered his own world record to 4:05.25, in a race where Ryan Lochte with 4:06.08 also went under the former world record of 4:06.22. Read here and here at SwimInfo.
Here is Phelps’ world record
