Read more310 Years On: Looking Back at Michael Phelps' Performance at the 2007 World Championships06 April 2017By Andy Ross. On April 1, 2007, Michael Phelps won his seventh gold medal of the 2007 World Championships in Melbourne, Australia in the 400 IM. A little over ten years later, Phelps is unanimously known as the greatest swimmer of all time. Almost everyone involved in the swimming community remember...