Two world records were set yesterday in the U.S. Olympic Swimming Trials in Omaha, Nebraska. Michael Phelps broke his own world record in the men's 400-meter individual medley with a time of 4:05.25, and Katie Hoff qualified for her second Olympics with her own world record in the womenâs 400-meter individual medley with a time of 4:31.12. The trials will continue through July 6th.
