World #1 Kendra Harrison failed to qualify at the United States Olympic Trials.

Three weeks after the trials, she set the world record, surpassing Yordanka Donkova's 28 year old mark.

Sisters Cindy Ofili and Tiffany Porter, American born but competing for Great Britain, their mother's homeland, were even in the third-place position.

By the fourth barrier, Kristi Castlin was in a battle for last place with Phylicia George and Cindy Roleder, half a stride behind Rollins.

It was also the first time that the United States has swept the medals in an Olympic women's track and field event.