 Beginning with her first Olympic win in 2008, Fraser-Pryce had been among the forefront of a booming sprint rivalry between Jamaica and the United States.At the Beijing Olympics four years ago, Jamaica had secured five of a possible six sprinting medals, with Fraser-Pryce and Campbell-Brown winning the 100 m and 200 m respectively, and Usain Bolt dominating the men's 100 m, 200 m, and 4 x 100 m (the relay medal was later rescinded).Jamaica’s success continued through the 2009 and 2011 World Championships, punctuated by Bolt's record-breaking performance at the 2009 event.